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own design profile

Old 07-24-2004, 10:06 PM
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racer-RCU
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Default own design profile

what do u guys think of this profile that i am designing, i plan on putting an os46fx in ti, right now the frame is extremely light, do u guys see any ares that need beefing up or strenghtening, give me some input
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Old 07-24-2004, 10:36 PM
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Default RE: own design profile

Looks pretty good Racer.

Two things jump out... The rudder/vertical look a bit on the small side for good 3-d performance, and if you are not going to sheet the rear of the fuse, I think it will probably fold on the first snaproll....You need to either add a CF tube that starts in the wing and run all the way to the tail, or have some kind of sheeting (1/16" balsa) to give it some structure and stiffness.

The rest of it looks pretty good Keep us posted and good luck.
Old 07-24-2004, 11:42 PM
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RSands
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Default RE: own design profile

I've only scratched one 40 size profile, so take it for what it's worth: Ditto matchless on the sheeting and CF, it's gonna fold right behind the wing for sure. Might also want to put some gussetts in, bottom of the rudder & where the control horns will be mounted, wingtips. I'd probably take the spar sheeting out a little further. How much sheeting is going on the wing?
Old 07-25-2004, 08:29 AM
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Kenny R
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Default RE: own design profile

I have to agree, needs sheeting or some other material to stiffen the rear part of the fuse. You might be able to run the shear webs on out the length of the spar and not have to sheet the wing.

Looks good...... to me there is nothing better than flying your own designs
Old 07-25-2004, 03:34 PM
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racer-RCU
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Default RE: own design profile

yeah i was thinking of putting to strips of 1/32 lite ply in the shape of a big v going to the back or 1/16 balsa sheet it, there is probably not going to be any sheeting on it, and i probably will run the sheer webs all the way to the wing tip, thanks again for u guy's input
Old 07-25-2004, 07:49 PM
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Default RE: own design profile

nice job,
I think a one inche balsa sheeting on top and bottom of trailing edge will improve the torsional wing stenght drastically
assuming it's a 40 size plane.
When designing the horizontal stab don't forget the 45 degree movement each side for the rudder.
It's about it for now.
Post more pictures after finishing the aileron and the stab.

Good work.

Phil
Old 07-25-2004, 10:48 PM
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Default RE: own design profile

I think it would fly better if it had a an elevator and ailerons

Seriously.... I'd have to agree with the comments about needing some sheeting on the rear part of the fuse. Some gussets between the trailing edge and the center rib would help too. You also might want to double the nose with some 1/8" lite ply.
Old 07-26-2004, 11:41 AM
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Spastic
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Default RE: own design profile

instead of shear webs on a thick wing you can just truss them, its lighter, cheaper, and faster, see pic,, might be hard to see on that pick...
dito on the fuse, the most common slight crash is a low speed cartwheel that ends in lesser fuses breaking right behind the wing[:@]
keep building and some day you too could have an airplane named after mexican food
an easy way to fix the fuse would be to just add a full length stick of spruce to the bottom and top fuse stringer
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Old 07-26-2004, 11:47 AM
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Spastic
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Default RE: own design profile

found a better pic, different design, hope it helps
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Old 07-26-2004, 12:06 PM
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Default RE: own design profile

Spastic,


Any way I could get the cad plans to your razor? I like the way it looks, and would really like to build one.

Email me at

[email protected]

Thanks

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