Piper Cub Sailplane - Page 2 - RC Groups
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Sep 26, 2012, 03:32 PM
Retired CAD guy
birdofplay's Avatar
I like your thinking and concept.
Nice graphic too :-)

If the pink foam does'nt work out try the Harder foam used inside Kayaks for padding
next time. It'll take a serious beating !
Plus the density might be needed as the wings are foam and you might not have much penetration.

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Sep 26, 2012, 10:06 PM
Build something.
Nodd's Avatar
Kayak padding foam huh? Interesting, I'll have to look into that, thanks Bob.

The Wheel
Okay well after sleeping on it I believe I have a solution for mounting a "tundra-sized" wheel in there. Best of all it doesn't involve me cutting into my carbon fiber reinforcing.

First thing was to carve out a wheel-well...

So here's what I came up with...

I made a wheel "cradle" from 1/4" plywood...

The blind-nut on the left will be where the tow-hook for winching will be screwed into (it'll be on the other side of the wood for final assembly)...

Test fitting everything...

Well that looks plenty strong to me. It'll be even more so once the fuselage sides are glued in place. The winch tow-hook position is a tad forwards of ideal but I figure she should tow well enough.

Hope to get more done tomorrow.
Sep 27, 2012, 11:32 AM
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Fred Sanford's Avatar
Sep 27, 2012, 08:51 PM
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Nodd's Avatar
I figured now was a good time to get the aerotow mechanism hooked up while I still have easy access. I made some mounting hardware for the servo...

The aerotow servo is mounted slightly off center so that the control arm is somewhat centered. The butt of the servo will protrude out into the right side a tad but it should be plenty thick enough to accommodate it...

Hooked up, adjusted & working like a charm...

I plan to place the battery up in the nose but I don't want it interfering with the aerotow release pushrod. The solution was to add a battery tray. As I'm not sure where the CG will end up I added several notches for the battery tie-down Velcro...

Time to add the sides
The rest of the radio instillation will be attached to the fuselage sides. So before I can proceed the sides need to go on...

On goes the other side...

Added some weight, will let the Gorilla Glue do its thing for a while...

Last edited by Nodd; Sep 27, 2012 at 09:59 PM.
Sep 27, 2012, 10:22 PM
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Fred Sanford's Avatar
I'm really enjoying this build! Thanks for sharing. Curious as to how you're doing the lightening holes as they appear to be neatly cut.
Sep 27, 2012, 10:54 PM
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Nodd's Avatar
Lightening Holes
I use a set of forstner bits to make my lightening holes. They don't chew up the wood like a large diameter drill bit...

Used with a drill-press they produce a nice clean hole (a hand drill will work too). Be sure to place a piece of scrap wood underneath what you're cutting. That greatly reduces splintering when the bit exits the other side of the wood...

Sep 28, 2012, 02:21 AM
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mikegbogh's Avatar
Hi Nodd,
Love your build threads, your pictures are always self explanetary and clear, nice to see how you innovate solutions .

One technical question, when weighing down the fuselage sides, must one use
crockery from the kitchen and does it have to be 6 x Brown plates and 7 x white plates or can the plates be white with patterns on , as thats what we have??

Nice trap.
Sep 28, 2012, 11:35 AM
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Nodd's Avatar
Patterned plates are actually preferable to solid designs. That way when you get glue on them hopefully the wife won't notice *wink*
Sep 28, 2012, 11:39 AM
RCG -Minus Member
microflitedude's Avatar
I have always liked Cubs, this a neat twist!
Sep 28, 2012, 01:22 PM
Retired CAD guy
birdofplay's Avatar
Got a whole set of Forstners myself :-)

Sep 28, 2012, 02:05 PM
was geht , müssen unten kommen
Keenan smith's Avatar
Cool a piper Sailplane! Awesome!

Sep 28, 2012, 03:41 PM
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seeingeyegod's Avatar
nice progress!
Sep 28, 2012, 09:09 PM
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Nodd's Avatar
Sounds like you folks are enjoying this almost as much as I am.

Okay time to make this ugly pink box pretty. First I sanded the top & bottom even...

I printed up another set of templates, this time for the top-down profile...

Sanded to the lines...

Then the magic starts, time to round things off...

Remove just a little material at a time, eyeball, then repeat...

Test fitting the tail feathers...

Tail Wheel
I needed a solid area to mount the tail wheel so I notched out a spot for a piece of scrap hardwood...

Glued the block in place...

Shaped the block then test fit the wheel assembly...

This being my first attempt at foam construction I'm not sure exactly how best to finish her. I could glass the whole thing. I've heard about gluing strips of brown paper on there. I've also heard that its possible to use spray paint directly on the foam but there's always that worry the paint will turn all my hard work into a pile of goo. I said screw it, lets go with paint so I masked off certain areas & prepared to take the plunge...

After testing a can of Rustoleum primer on some scrap foam I was confident enough to lay down a first coat...

From what I've read, you can get away with spray painting foam as long as you apply just a dusting at a time. Everything was going great until I ran out of primer. So that's a wrap for today. Pretty pleased with how she's looking.
Sep 28, 2012, 09:13 PM
was geht , müssen unten kommen
Keenan smith's Avatar
Wow! Just Wow!
Sep 29, 2012, 06:09 AM
Registered User
pfrommbe's Avatar
absolutely stunning!

How do you know the CG will be right without adding lots of weight? Did you do some tests before, or use the original fuselage/geometry as a guide?

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