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Old Mar 04, 2012, 05:53 PM
OSUFPV - KF7VFT
Corvallis, OR
Joined Apr 2010
1,776 Posts
Build Log
All Done. (Mostly...)

My new Skywalker is done. This will be my second Skywalker and I've come
up with a lot of new innovations to solve some of the annoyances of my last
one. I've lammed the wings, ultracoted the wingtips and horizontal stab, and
come up with a whole new wing mounting system. Also, a new cloverleaf for the
tail boom and gps mounted up front.


My old wing mounting system used metal bolts that extended all the way into
the fuse belly where they would be bolted, yuck! The new method involves
cutting off part of the wings that sits over the fuse and gluing it with CA to
the fuse. Then the rods simply slide though both holes then you slide the
wings on. No more bolts, no cheap rubber bands. Check it out:







The lamed wings and stab do add some weight but I'm fine with that
because I want the strength and the durability. After all, this is basically one
of the last V4's to sell and I want to keep it around as long as possible.

Speaking of weight; 2.65kg. No, I did not type that wrong. Nor did you read
it wrong. It's a heavy bird. But there's a good reason why, and its not
because the lam weighs 650g. Ive added a second 4S 4000mAh
battery to the plane. Yes, that means I have 8Ah total to play with. I'm
hoping that with the fact that the plane will have to fly faster to maintain lift
while having a lot of battery will equate to some nice long range flying. (And
some super long range if that damn RV Antenna tracker ever comes out. ETA
said February, it's now March 4th....but enough of my bitching.)

Realizing that none of my other friends do RC and I'd be having to launch the
heavy plane myself I felt stuck. On one hand I knew that a ROG takeoff was
my only real shot to getting this thing airborne. But on the other hand adding
landing gear would just add even more weight to the plane that
already was ridiculously obese. What to do about this problem? I would have
to construct some "launching gear" for the plane. A set of wheels that was
basically a dolly for taking off of cement and would separate upon liftoff. No
small task. I had seen it done once before but I never could remember who,
where, or why it was done. So I queued the music, and got to work.

This is what eventually came out of all my building:
(Apologies again for the crappy/blurry photos, my camera does indeed suck.)













And some video of me doing some doughnuts and generally taxiing around.
(Sorry for going off the screen at one point, I had no cameraman!)
Some Taxiing... (0 min 57 sec)

Some Onboard Taxiing (1 min 17 sec)

Can't wait to maiden. But will probably have to wait till next weekend
because I'm getting swamped with school.
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Last edited by Blueshy; Mar 05, 2012 at 01:11 AM.
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Old Mar 04, 2012, 06:42 PM
Registered User
Joined Mar 2010
528 Posts
so all you did was just glue the wing together, cut the center out and glue spars into the center part of the wing? do the spars get in the way when traveling? and what motor and prop combo do u run?

couldnt you have glue the spars into the winghalves?
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Old Mar 04, 2012, 06:45 PM
OSUFPV - KF7VFT
Corvallis, OR
Joined Apr 2010
1,776 Posts
Quote:
Originally Posted by fpvguy View Post
so all you did was just glue the spars into the center part of the wing? do the spars get in the way when traveling? and what motor and prop combo do u run?
No, I cut the last ~2 inches off of either side of the wings, glued those
together, then glued that to the plane. The spars are not glued in and you can
see that in one of the photos there are no spars through either of the holes.

-Blues
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Old Mar 04, 2012, 06:47 PM
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Joined Mar 2010
528 Posts
do you need a way to keep the wing halves from slipping off the spars?
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Old Mar 04, 2012, 06:50 PM
OSUFPV - KF7VFT
Corvallis, OR
Joined Apr 2010
1,776 Posts
Quote:
Originally Posted by fpvguy View Post
do you need a way to keep the wing halves from slipping off the spars?
If you look close there is a strip of velcro on either side of the halves. It takes
some serious effort to separate the wings from the plane because of the velcro.

-Blues
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Old Mar 04, 2012, 06:57 PM
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Joined Mar 2010
528 Posts
could i bolt on the center piece? how would i do that? and do you have an idea of the failing point of those spars?
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Old Mar 04, 2012, 07:02 PM
OSUFPV - KF7VFT
Corvallis, OR
Joined Apr 2010
1,776 Posts
Quote:
Originally Posted by fpvguy View Post
could i bolt on the center piece? how would i do that?
I just CA'ed mine directly to the fuse. You could bolt the center piece, but then
why have a center piece at that point? My old skywalker had the two wings
halves and I would bolt them on. It was a total pain and I don't recommend
bolting them on. You're better off with the stock rubber bands than bolts.

-Blues
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Old Mar 04, 2012, 08:40 PM
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Mt Tamborine, Queensland, Australia
Joined May 2008
757 Posts
Thanks for posting all the detail. Interesting stuff

What frequency are you using for video transmission? Also what frequency you using for your main radio?
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Old Mar 04, 2012, 09:57 PM
OSUFPV - KF7VFT
Corvallis, OR
Joined Apr 2010
1,776 Posts
Quote:
Originally Posted by tobermei View Post
Thanks for posting all the detail. Interesting stuff

What frequency are you using for video transmission? Also what frequency you using for your main radio?
1280mhz video and 433mhz DragonLink for control.

-Blues
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Old Mar 04, 2012, 10:47 PM
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Mt Tamborine, Queensland, Australia
Joined May 2008
757 Posts
thanks
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Old Mar 05, 2012, 04:39 PM
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parri0923's Avatar
United States, TX, San Antonio
Joined Jan 2012
81 Posts
The only issue with gluing the center portion on is no access to the nice ESC/battery compartment under the wing.
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Old Mar 05, 2012, 06:49 PM
OSUFPV - KF7VFT
Corvallis, OR
Joined Apr 2010
1,776 Posts
Quote:
Originally Posted by parri0923 View Post
The only issue with gluing the center portion on is no access to the nice ESC/battery compartment under the wing.
Yep. This is what I'm considering re-doing. Right now I have the aileron servo
wires go into small slits inside the center portion with female servo plug
connections glued inside of them and it's kinda a pain and counter productive
to a quick assembly. So I was thinking of moving them out of that center bay
and have them meet *just* out of the foam on the bottom of the wing
perpendicular to the wing. Kind of difficult to explain with words, I'll probably do
it later and post some pictures of it.

-Blues
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