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1/2A stunt trainer design

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Re: 1/2A stunt trainer design

Post  duke.johnson on Thu Jun 04, 2015 8:35 am

Very Happy That's so cool Roger! I need a laser cutter.
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Re: 1/2A stunt trainer design

Post  rogermharris on Thu Jun 04, 2015 10:11 am

duke.johnson wrote: Very Happy  That's so cool Roger! I need a laser cutter.

yea it's a great tool for sure. takes a few hours to draw out the parts and a matter of minutes to cut them. i keep pushing for a larger bed machine that will cut metal....
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Re: 1/2A stunt trainer design

Post  Oldenginerod on Thu Jun 04, 2015 4:47 pm

Roger. You da man Good Idea
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Re: 1/2A stunt trainer design

Post  rogermharris on Fri Jun 05, 2015 8:56 am

did some cutting before work today.

[img][/img]
[img][/img]
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Re: 1/2A stunt trainer design

Post  GallopingGhostler on Fri Jun 05, 2015 9:00 am

Looks good, Roger. You have a stuntable easy build sport plane, ought to be a lot of fun to fly. I just wished our area here in eastern NM had calm weather, like when I lived in California, Arkansas and Virginia. Smallest I fly so far is .15 because of that. Ron Cribbs can testify to that.

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Re: 1/2A stunt trainer design

Post  rogermharris on Fri Jun 05, 2015 9:56 am

GallopingGhostler wrote:Looks good, Roger. You have a stuntable easy build sport plane, ought to be a lot of fun to fly. I just wished our area here in eastern NM had calm weather, like when I lived in California, Arkansas and Virginia. Smallest I fly so far is .15 because of that. Ron Cribbs can testify to that.

thanks!  we have quite a few breezy days here. most often though in the summer the wind clams down early evening.  i am about 3 miles from the atlantic ocean and maybee a somewhere around a mile from the closest bay.

i think i will order another piece of this air foil. depending on how this one performs i might mess with the fuse length
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Re: 1/2A stunt trainer design

Post  duke.johnson on Mon Jun 08, 2015 4:12 pm

Roger
I'm back in town and tryuing to wrap up loose ends. So I owe you $23, right? How do you want it? In $100 bills? :-) Paypal? And if you send me your address, I'll print you off a copy of a plane with flaps you might like.
Here's a link with a picture, third post on second page of the thread, if I screwed up the link. It's called a Wing Master. I really like the plane and want to build another, but would make minor changes to the flaps for strength of the fuse.
https://www.coxengineforum.com/t5117p20-new-castor-oil-odyssey-plane
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Re: 1/2A stunt trainer design

Post  rogermharris on Mon Jun 08, 2015 5:09 pm

duke.johnson wrote:Roger
I'm back in town and tryuing to wrap up loose ends.  So I owe you $23, right? How do you want it? In $100 bills? :-) Paypal?  And if you send me your address, I'll print you off a copy of a plane with flaps you might like.
Here's a link with a picture, third post on second page of the thread, if I screwed up the link. It's called a Wing Master.  I really like the plane and want to build another, but would make minor changes to the flaps for strength of the fuse.
https://www.coxengineforum.com/t5117p20-new-castor-oil-odyssey-plane

Hundreds would be fine LOL!
Duke, I will pm you my email and mailing address. I like the plane. It looks similar in construction to mine. If you have a drawing of the ribs etc that you need send that along as well

Thanks!
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Re: 1/2A stunt trainer design

Post  rogermharris on Mon Jun 08, 2015 7:29 pm

Progress on my second trainer. I laminated the fuse from engine mount back to about 3/4" past the trailing edge of the wing with 1/32" plywood. Did the same on the stunt trainer.
[img][/img]
[img][/img]
[img][/img]
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Re: 1/2A stunt trainer design

Post  rogermharris on Mon Jun 08, 2015 7:29 pm

[img][/img]
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Re: 1/2A stunt trainer design

Post  roddie on Mon Jun 08, 2015 8:24 pm

SWEET Rog! Thumbs Up  I like it a lot. Coupling the flaps is tedious.. but I found it easiest to use a drill-guide attachment that comes with the Dubro hinge-slotting tool (#216) to drill the holes for a U-bent music-wire joiner. I twist the drill-bit with my fingers or a pin-vise through the hole in the centering-guide on the tool. Bending the "U" perfectly level takes some patience too. I install the coupler/joiner-wire first.. then mark and cut my hinges in. (same process for a split-elevator)

Here's the tool.. (shown with the drill-centering guide installed) I think the three drill sizes are 1/16", 3/32" and 1/8".



Here's the flap/elev. linkage on a tri-plane I designed years ago. The flap isn't split on this model though.. but the elevator is. I cut a < notch in the fuse for the one-piece flap.




Kind of a twist on "built-up"/sheet-slab construction.. wings and fuse.. covered in Mono-kote.



The tripe's tail-section of the fuse is framed with 1/4" square-Spruce stringers. It's hard to see in the pic.
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Re: 1/2A stunt trainer design

Post  rogermharris on Mon Jun 08, 2015 8:33 pm

Thanks roddiie! I may need to invest in some tools. I have always just gone the exacto knife method for cutting in hinges and yes flaps were always tedious as I remember. I'm also going to make one with a bit longer fuse to get a bit more space between the trailing edge of the wing and leading edge of the stab and see what works better
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Re: 1/2A stunt trainer design

Post  rogermharris on Mon Jun 08, 2015 8:39 pm

Love the tri wing btw roddie!
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Re: 1/2A stunt trainer design

Post  pkrankow on Mon Jun 08, 2015 9:48 pm

You'll love the duobro slotting kit! Less than a minute per slot, then you get better at it.

Phil
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Re: 1/2A stunt trainer design

Post  rogermharris on Tue Jun 09, 2015 11:50 am

pkrankow wrote:You'll love the duobro slotting kit!  Less than a minute per slot, then you get better at it.

Phil

on order Very Happy Laughing Clapping now i have to wait for it bounce Paranoid
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Re: 1/2A stunt trainer design

Post  rogermharris on Tue Jun 09, 2015 5:58 pm

Update on the bipe. So far I only see 1 fitment problem that I need to fix. I had enough material laying around to cut out a kit except for the 1/16" plywood for the struts. Hope to get to the LHS in the next couple days and pick up a small piece of ply to cut the struts. Other than that so far so good. I also have some plastic coming and hope to include the windshield as well
[img][/img]
[img][/img]
[img][/img]
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Re: 1/2A stunt trainer design

Post  roddie on Tue Jun 09, 2015 7:38 pm

Nice Rog! What's the nose's vertical dimension? Wondering how an aerosol-can cap-cowling would look. That bipe would look wicked with a cowl!  Cool




A few key provisions for a radial/reedie mount would be to use a pair of 3/8" sq. Spruce blocks.. vertically adhered both sides of the nose.. on the thrust-line. Make them only just longer (taller) than needed to accommodate the engines back-plate mount. I used 4 Brass tabs mounted to the tops/bottoms of the blocks, for additional support for the cowl.



I ended up mounting the engine cylinder horizontal/outboard. The trim accents help to give a more 3-D illusion to a cowling on a profile fuse.



And then there's Jim Roselle's gorgeous Staggerwing..

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Re: 1/2A stunt trainer design

Post  rogermharris on Tue Jun 09, 2015 7:50 pm

now that's cool roddie!

i love all the detail in yours but that red one is really sweet! i think your right, a cowl would really make a difference!
the nose is 1.75" high but it would be easy to build up a bit. whats the smallest cap that will work and what should i look for?
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Re: 1/2A stunt trainer design

Post  getback on Wed Jun 10, 2015 8:49 am

Roger , the Ring Bipe is looking good , If possible I would like mine in a single piece wing , I can pay the extra shipping if needed ? The Scout plans are in the mail to you , going to PM you some pics also . Thanks ! Eric Small Cox Logo
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Re: 1/2A stunt trainer design

Post  rogermharris on Wed Jun 10, 2015 9:10 am

getback wrote:Roger , the Ring Bipe is looking good , If possible I would like mine in a single piece wing , I can pay the extra shipping if needed ? The Scout plans are in the mail to you , going to PM you some pics also . Thanks ! Eric Small Cox Logo

oh i plan on it eric. these are the "export " wings. i wanted to cut a set and check the fitment.

i will let you know when the plans arrive.

who's this for a cowl Roddie? my first i must say. i cut a new engine mount and a backing plate






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Re: 1/2A stunt trainer design

Post  GallopingGhostler on Wed Jun 10, 2015 11:04 am

Cowl is a sharp addition to the Ring bipe, looks really good, firewall holes should provide ample cooling air through the cowl.

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Re: 1/2A stunt trainer design

Post  rogermharris on Wed Jun 10, 2015 2:45 pm

got home and threw the bipe together real quick. looks cool with the cowl! thanks for the suggestion roddie!!



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Re: 1/2A stunt trainer design

Post  rsv1cox on Wed Jun 10, 2015 4:00 pm

Wow, nice on everybody. Now I'm anxious to get my kit. Smile But, no rush Roger, I'm still working on my 1/2A Cyclone.

Bob
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Re: 1/2A stunt trainer design

Post  RknRusty on Wed Jun 10, 2015 6:49 pm

Wow, you dudes have some classy looking stuff going on.
Rusty

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Re: 1/2A stunt trainer design

Post  rogermharris on Wed Jun 10, 2015 7:00 pm

RknRusty wrote:Wow, you dudes have some classy looking stuff going on.
Rusty

Thanks rusty!

Having fun for sure. I think I need to cut a machine gun to mount somewhere...

I need to get the other two finished up. Not even sure I have another bee to put on this one..
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Re: 1/2A stunt trainer design

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