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Piper Cub foamy

Old 11-20-2007, 07:20 PM
  #1  
pburt1975
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Default Piper Cub foamy

Im a fan of the J3 Piper Cub and have decided to build a foamy of it. The plans I have were scratched out into autocad and designed to fit 1 piece of 30x20 foam board. About every piece can be cut from this provided 1 big factor, the Wing span is no more then 34" ..

So heres the scratch out of it.
On this, the wing is the top half of the board, 30" wide by 9" chord. I just remembered I do not have the wing tips on this board and that, along with the air foils will take a second piece of foam board. The wing tips will be 2x9 pieces rounded and tapered on 1 side.

The length nose to tail will be 22" (including rudder, 20" minus it)

No planned power system yet because 1) I know so little about sizing them, 2) I have no idea the finish weight of this plane (Minus the electronics).

I've already printed out the plan to fit a 20x30 foam board. Tonight I'll lay my plan on top of a sheet and transfer the lines then start cutting.

Things like servos and their linkages will have to be installed before I put the wing on. They will be mounted inside the fuse and unless I figure out a place to have a trap door (was considering the wing doubling as this), will be inaccessible when completed.


Plenty of bugs to work out at this point and the power system issue, but it'll work out in due time.
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Old 11-20-2007, 07:32 PM
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jrookie
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cool i want one
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Old 11-20-2007, 07:37 PM
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pburt1975
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Originally Posted by jrookie View Post
cool i want one
Plans will be at the house this weekend, Build your own, lol
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Old 11-20-2007, 07:40 PM
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h ya youra funny guy
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Old 11-21-2007, 01:38 AM
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Nice work fitting it all on one sheet, I will be following this.
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Old 11-21-2007, 03:18 AM
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Hey Kosh, thanks. Got that sheet cut out tonight. The paper has not been peeled yet though. Also, I think I may use basswood for the airfoil shapes in the wing. Reason being, I can cut the wood easier with a razor then the foam.
Anyway, here's tonights progress.
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Old 11-21-2007, 03:31 AM
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Originally Posted by pburt1975 View Post
Plans will be at the house this weekend, Build your own, lol
LOL!

Hey Ya'll I saw the scratchbuilt "slowstick" P made this past weekend. Let me tell ya what, this cat knows what he's doing!

Paul based on the size I think I got just the motor for ya. Remember the one I showed you in my box? No not the big one! The other one should work great.
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Old 11-21-2007, 04:20 AM
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Can't wait to see the results from your build... I guess i missed the Slowstick build that bill mentioned in an earlier post. I'll look around and see if I can find it.. Good luck..
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Old 11-21-2007, 04:34 AM
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LOL, Bill you're too kind for a slow stick, lol. And for the motor, wouldnt the big one give me unlimited vertical? hahaha, yea like I need that hehe. Actually, I told you that Bellanca deal fell through, this is the back up plan(e). I'll just put that money towards outfitting this one, whenever it returns.

Airhead, no pics here on the slow stick build, I just kind of piggy backed Chellie's build.

So far, looking at the cuts how are the proportions looking? I've already enlarged the rudder twice from my original plan.
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Old 11-21-2007, 04:38 AM
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oh,
I get it.. Thanks.. I'm gonna look...
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Old 11-21-2007, 04:47 AM
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Originally Posted by pburt1975 View Post
LOL, Bill you're too kind for a slow stick, lol. And for the motor, wouldnt the big one give me unlimited vertical? hahaha, yea like I need that hehe. Actually, I told you that Bellanca deal fell through, this is the back up plan(e). I'll just put that money towards outfitting this one, whenever it returns.

Airhead, no pics here on the slow stick build, I just kind of piggy backed Chellie's build.

So far, looking at the cuts how are the proportions looking? I've already enlarged the rudder twice from my original plan.
Hi pburt your plane is looking great, I Like the T L A R method you are using That, looks ,About, Right, Take care & keep up the great work, Chellie
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Old 11-21-2007, 08:43 PM
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Thanks for that link chellie, wish I could have found that before I started design, lol. I made these up based on about 25 different pictures, and comparing WS to length. Those plans have made me feel much better about my TLAR measurements,

I redrew the plans today slightly, fitting things better on the foam sheet and adding the (2) 2"x9" piece for the wing caps. surprised it all fit, lol. Cutting it out should not be to bad, the one I did last night was a snap to cut.
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Old 11-22-2007, 03:50 AM
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Originally Posted by pburt1975 View Post
Thanks for that link chellie, wish I could have found that before I started design, lol. I made these up based on about 25 different pictures, and comparing WS to length. Those plans have made me feel much better about my TLAR measurements,

I redrew the plans today slightly, fitting things better on the foam sheet and adding the (2) 2"x9" piece for the wing caps. surprised it all fit, lol. Cutting it out should not be to bad, the one I did last night was a snap to cut.
Hi Thats what I do, I will look at several planes, and take the best from all of them, and make one plane with all the best features, sure is fun, making your own jig saw puzzels Huh Take care, Chellie
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Old 11-23-2007, 12:19 AM
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The fuse is folded and taped up now, looks pretty good, maybe a tad out of skew, but its only tape right now. How does "Square-ness" of the plane play into effect? Im gunning for square, but whats the tolerance?
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Old 11-23-2007, 12:36 AM
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the more "true" the airframe is the better it flies. Probably not critical on that size and weight but get it as best you can and it will not only look better, it will fly better.
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Old 11-23-2007, 12:39 AM
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Thanks Bill, hey did you see my PNP question? This stryker joe bought has an antenna already in place, how do I properly tie into that?
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Old 11-23-2007, 02:17 AM
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Originally Posted by pburt1975 View Post
The fuse is folded and taped up now, looks pretty good, maybe a tad out of skew, but its only tape right now. How does "Square-ness" of the plane play into effect? Im gunning for square, but whats the tolerance?
The Very best That You can get it, and that will be good enough, cut out some square blocks of foam, and use them to help keep the parts square, pin the foam sides to them while the glue is drying , hope that helps, Chellie
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Old 11-27-2007, 01:45 PM
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Thanks Chellie, it does help.

I have not forgotten about this thread or the Cub. Provided I do not destroy this delta I fixed last night while trimming it in today, I'll be back on the Cub tonight and will have some progress pictures as well.
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Old 11-27-2007, 08:03 PM
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Hey Paul,

My intent (if/or when I was gonna fly it!) with that Stryker antenna was to simply CA my berg antenna to the inner piece and pull it through the foam out to the wing tip. This Cub looks pretty nice - I might have to try one - in Blucor though as I have lots of that!!

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Old 11-27-2007, 08:29 PM
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Thanks Bill, what I ended up doing was cutting my RX antenna and soldering the 2 together, covered with heat shrink. No range issues on this one, I am having an issue on another RX getting glitchy at only 10 paces with the antenna down on the TX, but will try extending the antenna to proper size and see how it does.

I NEED to get some of that bluecore foam. I really enjoy designing/building this stuff so far, although a solid way to mount the motor is eluding me. But I really get tired of making a mess pealing paper off the elmers foam board.

BTW, Im sure Joe has told ya of our crash weekend, most everything was fixed but now only the Delta is. Was gonna fly it today but the wind was 10 constant with gusts up to 25. I got as far as taking the delta out of my truck, the wind grabbed it and spun my wrist around, back in the truck it went:o. The PZ servo in the stryker stripped out from the throws on the TX being to large and now the one I replaced it with has glitched some how?? Will replace that later, right now I want my Cub done.

_______________________________

Speaking of the motor mount, does any one have a solid suggestion for that? Heres what my thoughts are so far
1- build a basswood frame in the nose of the cub for the motor to mount to
2- install 2 pieces of basswood ply (3/16" thickness) with a notch removed for a 3/8's stick to be glued to, then a stick mount used
3- Just put 2 pieces of 3/8's basswood ply together cross grained, and hot glue in place in the nose, then mount to that, like a firewall mount.
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Old 11-27-2007, 09:03 PM
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I think #2 or #3 will work just fine depending on the room you have and the CG. A stick mount allows for more versatility and adjustment but a firewall mount is more compact so whatever works!!



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Old 11-28-2007, 04:41 AM
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pburt1975
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Default Tonights progress

I went backwards, to go forwards

These pictures are from the start of the night, only slightly out of order. I started with the fuse taped, then untaped it but put the pictures in this order so they made more sense.

1- Opened up. Scores made on fold lines, other edges given a rough bevel with a razor.

2- Close up of the scores. Light bends are made on these creases

3- Taped up and dry fit

4&5- Shots of the fuse and tail taped up

6 - Wing profile
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Old 11-28-2007, 04:47 AM
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Add some hot glue and we get this

1- Fuse glued up

2- Tail section glued up, elevator not glued in place yet

3- Profile shot with the wing on top. I removed 1/2" from the trailing edge after taking this shot, and think I'll remove another 1/2" from it. Chord looks huge on this plane.

4- This is a shot of how I hinged the rudder. The plastic piece you see is hot glued between the sides of the tail section. The plastic piece happens to be the back side of velcro, you know the piece you remove to get the sticky .
The rudder has a slit cut in it centered as best I can and this piece of plastic is CA'd in that. Seems to work good.
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Old 11-28-2007, 04:50 AM
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And just so Hilbilly doesn't think his Easy Gapless Hinges Made Here tutorial went to waste

1- Under side of elevator, both edges beveled. Tape applied (sorry for the blurry pic)

2- Too side, before glue

3- Top side, after glue - you can just see a shiny strip down the hinge line

4- Hinge complete and tested A-OK!!
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Old 11-28-2007, 04:58 AM
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Originally Posted by pburt1975 View Post
And just so Hilbilly doesn't think his Easy Gapless Hinges Made Here tutorial went to waste

1- Under side of elevator, both edges beveled. Tape applied (sorry for the blurry pic)

2- Too side, before glue

3- Top side, after glue - you can just see a shiny strip down the hinge line

4- Hinge complete and tested A-OK!!

Its Looking good keep up the great work, were all watching you Chellie
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