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MAXIRmania
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MaxiR SE Micro-heli Build & Review
by Glen Peden
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Introduction:
With one base MaxiR micro-heli kit under my belt, I thought
it might be fun for me, and useful for others, if I did a
review of the MaxiR SE kit. While I do sell
them now, suffice it to say that
I got into this only because I really liked my first MaxiR -
I always figured that it's easy to sell something that you
really like! If you think I'm pumping sales with a glowing
review, then please read the entire review. Although one
might infer I don't like the heli while I'm pointing out
some issues that were encountered, don't get me wrong -
these MaxiR's are fantastic little micro-heli's!
User
testimonials are given at the end
of the review.
The Maxir SE was originally available as
a custom-numbered, limited edition, pre-built (with motor
installed) "collectors heli." Evidently it proved to be
popular because now this model is available as a kit. It
features anodized red or blue coloured aluminum frame sides,
boom and other parts, as well as CF fins, blades and misc.
upgrade parts not included with the base model. A very
unusual features is the very light combination flybar and
paddles (see last photo), which probably help with the 1
roll/second performance. Compared to the base kit's
fiberglass frames, this SE kit has a slightly different
pattern to the frame sides, which allows the option for
placing the motor ahead of the main shaft (edit: newer base
kit frames are like this too). This would be useful with
balancing when a lighweight LiPO back is being used in
conjunction with a heavier gyro like the GY401. My previous
experience with the base kit's great performance, amazing
durability, reliability, and modestly priced repair parts
has me looking forward to my life with two of
them!
I was pleased to notice that there's a
new manual with colour CAD renderings available on the
LAHeli
web site.
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KIt Specs (actual/used):
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Rotor Span: 620mm
RTF weight: 350 - 450g (not
completed to weigh)
Motor: AXI 2208/26 (AXI
2208/20)
Battery: LiPO 2S-3S 700 - 2000 mah
(LiPower LIte 3S-1320 mah)
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Rotor blades: LAHeli carbon 28 cm
(included in kit)
Cyclic servos: HS-55 (Airtronics
94091Z)
Tail rotor servo: HS-50
(HDS-877)
Gyro used: FutabaGY401
Speed control: TMM 2512-3
Heli
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Build Philosophy:
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Huh? What's that? :) Well, I guess it
describes an approach needed for success with a minimum of
anguish. These MaxiR kits are described as "builders kits"
sometime, and perhaps that fits. With any micro-heli, some
fiddling will be required, granted. But with the MaxiR kits
there are a few tedious areas - things that perhaps did not
have to be, and even a few more with the MaxiR SE.
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So please don't figure on building today
and flying tomorrow. Or perhaps even next week. Take your
time and adopt an attitude that allows for patient assembly
of the kit. Enjoy working the parts to make them just loose
enough to be nicely free-moving. If you are a n00b, don't
rush into a solution to some difficulty without perhaps
asking others about it. Please check out my MaxiR
enthusiasts' site and
forum
for more info about assembly of the MaxiR.
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A word about these photos: In an effort to show contours in the
black plastic, some photos were deliberately underexposed. Also,
trying to accurately portray the colour of the anodized red parts was
very challenging. And.... click on a photo to see
a larger version of it.
Kit Contents:
Maxir kit is organized into many bags.
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The photo on the left shows the kit
contents less the blades. The one on the right shows the
essential differences between the base kit and the SE. The
anodized parts are finished very nicely. The carbon tail
rotor blades and paddles are nicely made with a very nice
finish. The flat pieces like the tail fins and others are a
little odd, compared to what I'm used to - they are finished
on one side only. The other side has the undulating weave in
its natural 3-D relief. They remind me of the dimpled
flights available for darts. They are quite thin and very
light and perfect for the job, I'm sure.
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Good value in "bling" is included.
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On the left is a photo of the aluminum
"bling" and o the right is the carbon "bling" included in
the Maxir SE kits.
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Building the Canopy:
(later)
Building the frame:
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A note about shaft/bearing fit: If
a bearing is so hard a fit on a shaft that you are resorting
to hammering it, don't do it! First try other bearings and
you might find enough variances in their manufacture that
you get an easier fit that way. But be prepared to chuck up
the shaft in a dremel tool and run it with a piece of fine
emery cloth folded over it. This only takes a few minutes of
sanding and trial fits to get it good. If you force on a
bearing, you will very likely live to regret it!
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Although there aren't that many, it's
best to scrape off any casting remnants on the plastic parts
using an razor knife before assembly. The first step
involves pressing the bearings onto their mounts. Inserting
a rod such as the round shaft on a hex driver into the
bearing helps with steering it into the bore straight. Don't
use the main shaft for this because you might bend it. The
manual shows the base kit's construction photos. One
difference with the MaxiR SE immediately coming into play is
that the "swashplate lead" (anti-rotation pin) is replaced
by a nice setup using an extra swashplate ball which rides
within a guide. The photo on the left shows that part lined
up to be installed. The main shaft is shown inserted in the
ball bearings to test for their alignment.
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My kit came with the head block installed
on the shaft. It should spin very freely - check this as you
build the frame to make sure that it doesn't get misaligned.
One little problem that was easy to see was that the top
bearing block just did not want to line up parallel to the
top of the frame. The servo mount interfered with the top
corner of the frame. Getting the bearings installed in line
with the shaft is very important, so I filed the sharp
corner down a bit and also took away a little bit of
plastic. Alignment of the frame sides was checked one last
time and the screws firmed up in their seats. The swash
guide was then screwed into place with its solitary bolt.
Note that the MaxiR SE frames allow for
mounting the motor to the front or rear of the main
shaft!
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The simple undercarriage frame is the
heart of the Maxir's crash survivability. Usually if
anything breaks it's the skid mounts and they can usually be
repaired if desired. Then the frame triangles will bend and
absorb impact, but also sometimes break. The frame triangles
are slid onto the frame rods while checking alignment with
the mounting holes in the frame. The photo shows the frame
triangles installed in the frame and the rear one screwed
into place before final fitting of the front one is done.
After that the skid mounts are screwed into place and then
the skids snapped into position. I find it helps to first
screw the skid mount's screws into the skid triangles
without trying to fasten the mount -
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just concentrate of forming the threads
and getting the screws nice and straight. The skids then go
on nicely. A frame stiffener is included with the SE kit,
but I left it off until the the kit is assembled and all the
gear installed to make it a bit easier to get the motor in
and out as required. The white plastic battery plate holders
were inserted in the plate and then they were slid onto the
frame rods. It helps to file the ends of the rods a little
round to facilitate them being slid into the mounts. At this
point the aluminum canopy bolts were swapped for the screws
used in error as shown in the photo of the completed frame.
Also, I'd neglected to keep one antenna tube holder on the
skid to the right side, so I fixed that too.
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TAIL BOOM:
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The first step is to slide on the boom
holders. To prevent the tear-down I had to do with my first
kit after it was built, the tail servo holders, pushrod
guide, and boom support mount were also slid into place at
this time (not mentioned in the instructions). I go my own
way with the tail drive bearings - I use a toothpick to
smear a thin coat of black CA inside the spacer rings before
inserting the bearings. The bearing spacers are tapered a
little so it's best to position them for easy insertion from
the back of the boom. Once the bearings are installed on the
tail drive rod, I place a dab of black CA on the joint with
the tip of a pin to hold the bearing in place. These parts
are not as tight a fit as described in the manual. The idea
here is to keep the bearing races doing their job instead of
having other parts moving.
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Also, I like to be able to pull the tail
drive out from the boom without any parts staying behind:)
The conned gear is inserted into the bearing with a 3 mm
I.D. and then pressed onto the tail drive. I get the press
fit started by hand, then I insert the other end of the
drive rod into a small hole in my workbench. I use a 2.5 mm
hex nut driver that happens to be the right size to use as a
hollow drift. It fits nicely on the conned gear, inside the
gear teeth and around the drive rod if it pokes through.
Then I hit the end of the driver with a length of 2 x 2 inch
wood I have for these purposes:) I get the rod just poking
through the gear.
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Tail rotor gearbox:
Shaft inserted into gear
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A very touchy step is getting the other
conned gear nicely mounted on the tail rotor shaft. Using
the very helpful hole in my workbench again, I set the flat
part of the conned gear over it while hitting the end of the
shaft with the 2" x 2 " block of wood. Doing this protects
the end of the shaft. Once in the proper position (spacer
and bearing should make the shaft flush with the outer edge
of the bearing), it's time to install the keeper ring. The
bore of the ring has a little bit of a chamfer to
assist
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with starting the pressed fitting. I
cheat a bit and put a tiny chamfer on the conned gear's
mating cylinder. As shown in the photo, I use a brass tube
as a drift to start the locking collar on straight and drive
it home while the short end of the shaft is hanging free in
that hole in the bench. This basically leaves the shaft free
and unaffected by this last step, with the force being
applied directly to the ring and the conned gear. This
technique works very well! Make sure that the shaft assembly
rotates freely when installed in the tail rotor
case.
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Hollow drift made from two pieces of brass
tubing
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LOcking collar installed
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Take your time to get this just right!
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Next the tail drive pinion is pressed
onto the tail drive shaft. Any mold irregularities are first
shaved off the base of the pinion. Again I "cheat" by
cutting a small chamfer into the bore of the pinion to allow
an easier start onto the shaft. I stray from the
instructions by using a small washer underneath the pinion.
It must be narrower that the outer race of the bearing. Rest
the other end of the tail shaft assembly (boom and all) on
the bench and then hammer on the tail drive pinion with the
block of wood. Once the pinion has a decent start onto the
shaft, I flip the shaft assembly around so that the tail
drive pinion is sitting over the hole in the bench. The
little nub of carbon shaft poking out of the conned gear on
the rear end of the shaft is now smacked by the block of
wood. If pressed on too far, use a GWS gear puller to pull
out the gear a little bit.
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All the while, trial fits of the entire
gearbox assembly should be done to ensure the best fit. One
trick I learned from surviving the Hornet gearbox is to try
different orientations of the conned gears relative to each
other. Although not needed near as badly, this technique can
help any out-of-round tracking of these conned gears cancel
each other out. So if you notice a repeating variation in
gear lash as you do your fitting of the gears, try lifting
one out and rotating it 180 degrees. Dab a bit of grease on
the tail gearbox just before final assembly.
***Time spent making sure the tail box
is assembled accurately will pay off with a MaxiR that can
fly well right off the board.***
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Now that the tail rotor case is clamped
tight, you might find that the gears have tightened up
unacceptably. This tends to happen and an experienced
builder might leave that little bit extra play when first
setting the tail drive pinion distance along the shaft. If
you notice this at this point, very carefully prying the
pinion out the tiniest amount can restore proper easy
movement. Be careful not to pry it out too far, or you might
be finding out that it isn't that bad to have to strip it
all apart to press the pinion back on a bit. The manual
suggests how a mod can be done by cutting a hole for a
screwdriver in the upper tail case. This can allow pressing
on the tail drive pinion in the field without having to
disassemble the tail case.
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Photos of this and also how utterly
useful the GWS gear puller is can be seen on my MaxirMania
tips
page. It's best to end up with
the tiniest bit of longitudinal play on the tail drive shaft
for the smoothest result. At this point I've lined up the
tail rotor case with the boom mounts at the other end and if
I'm lucky, it won't need adjustment. Later on, once the
model is completely assembled I put a drop of black CA on
the joint between the boom and top half of the case. Others
like to drill though the case and boom (only barely through
the boom!) and install a tiny screw. Otherwise the case can
turn on the boom, even through it seems tight
enough.
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TAIL ROTOR:
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The first step in building the tail rotor
is inserting the bearings into the blade grips. It really
helps to have a tool such as the 1.3 mm hex driver shown in
the photo to aim and steady the bearing as it's inserted
into the grip.
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Then I use a piece of brass tubing to
press on the outer race of the bearing and squeeze it all
the way home. Double check that it is fully inserted. Please
note that myself and others have been "bitten" by this. I
repeat - you might think it's all the way in when it is
not!
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The blade grips are bolted to the hub and
the ends of the bolt protrude just a little into the bore
for the tail rotor shaft. This allows these bolts to fasten
the hub to the shaft. On one side I encountered too much
friction between the hub and the grip, so this was remedied
by enlarging the hole in the end
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of the grip just a little. A nice change
over earlier models is that the tail slider is threaded to
accept the brass piece. However there was no tight friction
fit, so I used a toothpick to rub a bit of black CA into the
joint as can be seen in the photo on the right (shiny area
near brass).
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The most tedious part of the assembly is
gluing the "L" pins into the slider. Hang in there - it will
work out:) Trial fit the pins into the slider. With this
model, one pin head would not fit into the recess meant to
receive it, so the head was filed a bit to reduce its
diameter. The arm of the pin does not sit at a 90 degree
angle to the slider body, so it must be custom fit by
assembling the unit and then using CA (I love the black
stuff - it's more flexible) to fill the little wells that
house the head of the pin. Get the whole thing assembled,
the hub tightened onto the end of the shaft, and try to hold
it together while checking the fit. Notice how you can hold
some twisting tension against the pin to keep it parallel to
the rotor shaft by pressing a bit on the blade grip with a
finger. I hold the position of the blade grip to be a bit
off zero degrees pitch for gluing - this holds the pin at a
slight angle towards the main shaft and is sort of a
midpoint in the way the pin is flexed from side to side
during movement of the slider mechanism. Once the whole
method is understood,
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pop the pin out of the recess a bit and
place drop of CA (on a toothpick is a good idea) in the
recess. Pull the head back in and then make sure the pin is
parallel to the rotor shaft (as seen from the end of the
tail slider only - it will angle in a bit, but is parallel
in that one plane only). Spray on a bit of accelerator and
check your work. Put a drop of CA on the pin/slider joint on
the backside to ensure a solid glue joint. before doing the
other side, check to make sure that the two blade grips will
be at zero pitch at the same time by sighting along the
blade grip. It's pretty easy to see if the angles are off.
Im my case, and although I thought I was gluing the short
one first, it turned out the remaining one needed to be
"stretched" a little bit. This was done by working the
plastic in the grip a tiny amount and filing the underside
of the pin head a bit (there's residual metal on two spots
that can be filed down a bit). The end result was a very
smooth pitch slider assembly. The pins tend to offer some
resistance as the slider almost touches the rotor
hub.
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I was pleasantly surprised to find
another part had been redesigned when I assembled the tail
pitch lever to its holder. The lever arm now has a step in
it so the clevis that attaches to it easily clears the tail
rotor case bolt. In the past, some mucking around and filing
was required so the clevis pin did not catch on it. Now all
I had to do is file the one bolt where it protruded and
could interfere with the lever. The shiny end where it was
filed can be seen in the photo.
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Here's a little hint: it really helps to
pre-thread the lever holder using a 2 mm bolt before trying
to attach it to the underside of the tail case.
The carbon vertical fin sits a little
loose on its mount and is meant to be CA'd to it. I did this
after everything was assembled, while holding it vertical
and adding a drop of CA to the outboard side of the
joint.
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I've used the lovely CF tail rotor blades
on my base kit until I broke one, so I was expecting to have
an issue to deal with: the hub of the blades is thicker than
the slots in the tail rotor grips, so the faces of the blade
hub need to be filed down. They came with a thickness of
about 2.15 mm and seemed to fit nicely with some freedom of
movement at about 1.92 mm. Just file and trial fit until it
suits your taste. The blades were balanced on a high point
balancer using a method I picked up from my LMH 110 heli
assembly manual 5 years ago, as shown in the photo.
Balancing the blades with leading edges facing up or down,
with a symmetrical "V" position as shown is a very accurate
way to balance.
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Keep making the "V" a little steeper and
re-balancing until it's as accurate as you like.
Unlike my earlier set of CF tail blades,
these were very close and only a small amount of material
was sanded off the tip to make them balance well. I slightly
round off one end of the CF blade mounting pins so that they
be more easily inserted. Dab on a tiny bit of CA to the ends
of the pins to secure them in place after they are
installed. The GWS puller will pop these out later, no
problem! Mount the blades and give the tail drive pinion a
good twist and see how smoothly and freely the tail rotor
coasts. Do not accept anything but the best you can do with
the tail and let this be your test..........
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ROTOR HEAD:
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In my opinion (and flaws pointed out here
aside), the LAHeli MaxiR rotor head is one of the reasons
this is such a fine heli.
I'd noticed that some MaxiR SE kits come
with the rotor head pre-assembled onto the main shaft. Why
this is done was baffling to me, but I found out while I
built the head. Perhaps I do things backwards, but I sure
like to get the mainshaft installed without the head
attached. This allows easier fitting of the tail drive
pinion gear lash and also to run up the heli and press my
fingernail against the shaft to check for trueness. Running
up the tail boom without the head installed lets one more
easily sense vibrations associated with the tail. Anyway, as
I've mentioned on my MaxirMania web
site, there is an issue with the
alu rotor head not being milled the same on each side. The
hole in which the O-rings sit is deeper and wider by a small
amount on one side. This aberration is more or less
identical on every rotor head. I've checked a few and a
distributor in the USA found all of his to be similar.
Anyway, with the 3 mm crosshead shaft, these differences are
easily seen by eye. The O-rings look like they are
overflowing from one side. In fact, because of this the
spindle sticks out 0.25 mm further on one side! I can only
imagine how that throws off the balance of the head when the
blades are installed. Here's a link to a small 340K QT
movie
showing how my rotor head balanced.
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At first I thought that this was solely
due to the weight of the bearings. But knowing that some
main shafts have been bowed right out of the package, I
decided to rotate the shaft 180 degrees within the head. The
pin was a little tough to remove and then when I tried to
turn the shaft, it would not move!. So I inserted a hefty
T-pin into the bottom hole on the shaft and used it to apply
much more torque on the shaft. This allowed me to twist it
around. When I inserted the pin, some dry powder came out
the other side. Since I've found that the alu shaft fits a
little loose on the shaft, I guess applying some filler
material was the "engineering solution" to this issue and
assembling the head onto the shaft was necessary to do
achieve this. Anyway, rotating the shaft allowed the head
block and mainshaft balance nicely. The two problems had
canceled each other out just fine. The head remained still
on the high point in all postitions now. Still, having one
rotor blade positioned 0.25 mm further out than the other
will have "some" effect on the overall balance after a
matched set of blades is installed! Therefore, balancing the
entire head will be a good idea
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Holding level
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After letting go
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After inserting the bearings in the
paddle bearing housing it is placed inside the rotor head
and the set screws with shoulders are screwed in. Tighten
them until you can feel the housings movement stiffen and
then back off a small amount. Make sure that the housing is
centered - if not adjust the set screws. Now pull out the
screws one at a time, apply a small amount of blue loctite
and reinstall to its former position.
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When I went to install the short flybar
through the collective mixer housing I was surprised to find
it quite tight. Somehow the two sides of the paddle bearing
housing's "tubes" do not quite line up with each other.
Again, some work was needed to get these parts moving
freely.
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I like getting all the pinned joints
assembled and free-moving before putting the head together.
Everything is assembled and ready before the flybar is
inserted. Hopefully you can imagine inserting the flybar
with the assemblies lined up as shown in the middle photo on
the right.
I'm not sure if this kit had an unusually
large set of CF pins, but unlike my previous experiences
with the other MaxiR, the mixing arm and links were quite
stiff upon assembly. In fact it was the forks in the "long
pushrod" and "pushrod with ball junction" that were doing
the pivoting. The holes in the mixing arms were enlarged to
let them do the pivoting. The arm assemblies were then
worked rapidly back and forth by hand to help loosen them
up. The outside of each pin was given a small dab of black
CA to keep the pins in place and make sure that any wear
occurs in the cheaper mixing arms.
Once I tried to insert the 1.5 mm flybar
into the brass counterweight, I got another surprise. It
just would not go in.
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I ran the set screw all the way in to
bring out any flashing that might be a problem land then
tried inserting an old flybar from my other kit's bent parts
stash. No real change. Then I found a drill bit close to the
correct size and put it in the hole and twirled it with my
fingers, hoping that there might be some cutting or forming
action found using the side of the drill bit. After that I
was able to drive a piece of old flybar in, bend a 90 degree
handle, twist, and pull. That opened it up the tiny amount
needed. I really did not want to remove any metal because it
is a "counterweight", afterall. The stubby flybar for this
kit was centered by taking measurements from the inside
(flat) area of the counterweight and collective mixer
housing at the end of the flybar. As usual, I found the
patience to get it really close, within a few hundredth's of
a millimeter.
The collective mixer has been improved
recently. Now it rides on derilin bushings instead of the
threads of a bolt. This is a nice improvement as I have
replaced one collective mixer on my other MaxiR due to wear
after around 20 hours or so.
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When assembling the blade grip halves, it
helps to place a finger right under the place were the
pressure is applied and give strong pressure on the screw
with the phillips driver. This helps reduce stripping of the
screw head and the threads. Do them up good and tight -
there will be a small bit of the screw tip poking through
the back side when they are good. If the assembled grips
don't rotate freely, the chances are very good that the
half-
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moon cut-outs for the bearing spacers
aren't quite big enough. A little bit of work with a small
round file will fix that in a jiffy. The SE kit comes with
bearings for the mixing arms instead of bushings, which is a
nice touch! As you tighten up the bolt for this bearing work
the arm and once it starts to bind up (nice easy play 'til
this point), back off the screw a tad. I'll leave off the
paddles until the Maxir is complete to save them from being
bumped and bruised.
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Freewheel assembly:
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This MaxiR SE kit comes with the latest
freewheel upgrades done up in a nice anodized colour. First,
insert a ball bearing into the freewheel hub. I have a nice
screwdriver that takes the bearing over the tip and then
catches it on a step - perfect for pressing and steering a
bearing into place. Next, the one-way bearing is pressed
into the hub up against the first bearing (note that for
proper rotation with the one-way, the text on the rim on one
end must be on the bottom and exposed after being inserted
into the hub. That was much easier said than done. This time
was tougher than the first one I installed on my other kit.
Even cooling the bearing and heating the hub did not help. I
ended up pressing it in with a vice. It will never come
out.....
One little thing that has to be done is
the little spacer that goes above the freewheel bearing has
to be filed to the proper thickness to get the tail drive
pinion meshing nicely with the inner gear on the top of the
main gear. I assemble the tail boom into the frame at this
point to do this right and then remove the boom afterwards.
Setup the boom mounts in the middle of their fore-aft
adjustment within the frame to allow minute adjustment
either way afterwards by moving the boom forwards or
backwards th elittle bit that is allowed. Prepare the main
shaft by assembling the freewheel ring onto the end of the
main shaft and pin it. If the holes do not line up, rotate
the ring 180 degrees.
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With the freewheel hub inserted into the
gear and the spacer resting on top, hold the gear in place
and insert the main shaft from below. It might take a few
trial fits to get it the proper gear mesh withthe tail
drive, so patiently file down the spacer by rubbing it on a
flat file under your finger. To check for proper gear lash,
hold the main gear still with a finger and move the tail
rotor hub while watching the amount of movement that the
tail drive pinion can do within the gear it meshes with. You
can see this through the top of the frame. Keep filing until
there's only the smallest amount of gear lash, if any. Once
the fit is good, slip on the end cap with its supporting
bearing by removing the 3 screws at the lower rear of the
frame and bending it out enough to slide/squeeze the cap
onto place.
Once installed, the freewheel had a lot
of friction - I could barely move it. I removed the
freewheel assembly and rebuilt it outside the frame. It was
fine until I slipped in the plastic freewheel spacer and
found that it's wall thickness was greater on one side and
needed to be filed down a bit. I'd seen that this part was
like this, but had decided to try it instead of using one of
the many good spares I had on hand. When it's finished, one
should be able to twirl the main shaft with his fingers, to
wind up the tail rotor The whole thing should coast a bit,
even though there won't be much momentum from the very light
tail rotor blades, compared to what you get with the stock
plastic blades on the base kit.
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Servo Installation:
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Some time ago I acquired some excellent
Airtronics 94091Z micro-servos after seeing them being used
in the MaxiR. Unfortunately the servo arms that are included
are either too short or too thick. Rather than file down or
otherwise customize appropriate servo arms, I decided to try
the Duzi CNC arms meant for the Maxir. As seen in the photo,
they are a nice one-piece bearing housing (for attachment to
the arm) and rod with a threaded end. I had ASSumed that the
bearing would somehow also pivot within this arm to allow
greater freedom of movement. The harsh reality of it
pivoting in only one plane meant that the servo installation
was much more strict in the sense that the servo pushrod
must be exactly vertical. This made it much harder, but I
have gotten them installed using 1 mm spacers made from old
Maxirfiberglass frames. The reinforcing webs for the servo's
mounts had to be cut away so that the servos could be
mounted on the wrong side of the lug.
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the result was a nice, tight
installation, but you know what? For all the bother I wish
I'd just used the HS-55 or maybe the HS-56
servos......
Although the extreme angle of the aileron
servo pushrod caused minor swash interaction problems that
could be programmed out, I'd prefer to try the inboard hole
on the servo arm. Unfortunately that would cause the right
side aileron servo to hit the elevator servo's case. I could
try moving the servos and using the underside of the servo
arm, but then the vertical alignment would not be perfect.
As you'll see in the next section, evidently I'll have some
time to figure this out anyway:)
UPDATE: This section will be
rewritten. Shorter spacing on the servo arms had do be
achieved. This was obvious when I installed the new swash
and and noted how extreme the throws were. The elevator
servo was moved to the other side of its mounts and the
pushrod was moved to the underside of the servo arm. This
had been tried before and would not line up properly, but
all it took to fix was a slight bend in the Duzi pushrod.
This is much better! New photos to come!
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After I hooked up a receiver and started
setting up the swash and servos I found a big problem - the
nice looking aluminum swash had a ton of play, all in the
bearing! This was a surprise, because one that I've been
using in another Maxir and another grey one I have in stock
were just fine. Unfortunately they are both the earlier
version with a different anti-rotation method, or I'd use
them. So this project is temporarily on hold since the
middle of November until I get a replacement swash. Oh
well, now I can take my time with the canopy if I want and
get most of this review done now:) I'm daring to publish an
incomplete review because I hope that it will still be
useful. More to come!
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FInding me a good
swashplate...
UPDATES:
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Dec. 15: Icare reports that LAHeli
is working to resolve an issue with some of the alu swash
bearings being too sloppy...
Jan. 22: replacement swashes have
arrived at Icare here in Canada, so I expect to finish up
this heli and review soon!
Mar. 20: Finally placed an order
and had the replacement swash sent along. It was perfect, as
was another replacement for a customer. But of the two SE
kits I was sending out, one had a bad red (sigh...) swash.
Guess where mine went? :)
April 28: The replacement swash
arrives and it's just like the one I sent back last
month.
May 10: I decided to "borrow" a
swashplate from a kit, one that had only a tiny bit of slop,
while I waited for replacements to come. It's good enough
for me.
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Completion:
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After finally sorting out the servo
installation, as noted above, the result was quite good and
I'm glad I did it. I've tried the 3-D tail pushrod on my
other Maxir recently and I really liked it, so I decided to
use one on this model right from the beginning. It's
basically a carbon tube with metal fittings that are glued
into the ends. Also, a 2mm Mikado ball link threads on
handily for a nice, secure attachment to the larger servo
arms on the tail servo. It makes for a simple direct hookup
without having to line up the pushrod in itls guide. The
usual neutral position with the servo arm and tail lever arm
at 90 degrees to the pushrod seems to work out very
well.
A 16 tooth pinion was chosen over the 15T
- might as well go for it:) I use a razor knife to cut a bit
of a taper at the bigging of the pinion bore to allow easier
insertion and press the pinion on in a vise. I have a
coupole of flat aluminum plates that I use to protect the
pinion and the motor from the rough faces of the vise. The
motor was installed with a fairly tight mesh, leaving only
the slightest visible lash at the loosest point.
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Rather than slice off the horizontal fin
with the blades the first time I have a bood boom strike, I
just slipped in a package to sell in my store:) A spacer to
take the place of the fin mount was found and the tail boom
support brace installed upsidedown to place the clamp below
the boom and protect it in the event of a boom
strike.
The boom supports were assembled and
attention paid to getting them the same length and getting
the links orientated at the correct angles. a drop of black
CA was all that's needed to fix them permanently.
The CF paddles were pressed on the short
flybar. It was a challenge to get one of them all the way
on, but it did go. At this point I wanted to see what
sort of headspeed I might be getting, so the heli was run up
without the blades. 3000 rpm was tached.
This is the first time I've used LAheli's
carbon blades, having been quite happy with the cheaper
fiberglass ones. This set was very close to perfect and only
a tiny piece of monokote trim was neede to balance
them.
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First Flights:
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Well,,, winding up that head close to
3000 rpm and using the carbon 3-D blades makes this a whole
different ball game over the standard kit! The 1 roll per
second roll rate that I'd heard about does not seem to be an
exageration. The heli is very agile! This extreme
sensitivity makes flying a lot less relaxing though. While I
am enjoying the performance
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of this setup, I might revert to the
standard flybar and plastic 3-D paddles for a more stable
setup. At a recent funfly I ploughed it into the ground with
just a little over-correction while doing a low roll.
Regardless, I'm going to work on the existing setup to tune
it more to my liking and this might be achieved by dialing
back the revs a little bit.
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User
Testimonials:
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I was planning to do this anyway, but now
seems like a good time to solicit user testimonials.
Hopefully some idea of the MaxiR SE's flight performance
will be given by others while I wait for my swash, hehe.
They don't have to be perfect, or positive, and won't be
edited except if I catch spelling errors - please send them
along to me
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Links to comments:
Rob
Sleath's testimonial
Neil
Coulombes comments
Bob Holkan's
testimonial
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Copyright ©
2005 Glen Peden