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My 90 size SPAD - 2/1/2006 4:57 PM   
jamesg25



Posts: 89
Score: 100
Joined: 12/21/2005
Last Login: 4/15/2012
From: london, SINGAPORE
Status: offline 		Hello all
I have decided to build a 90 size spad for lack of much better to do and the fact that i have a 90 size engine that is BUSTING to get on a plane... so here goes

tech spec
Span:66.5
fuse:60
chord at root:18
chord at tip:12
wing area: about 7.8ft^2
goal weight: 7pbs...(optimistic)
wing: symmetrical(more semi symmetrical) all 4mm coro using a 2mm thick aluminum tube with a diameter of 40mm as a spar

here are some pics of my progress...
Enjoy








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RE: My 90 size SPAD - 2/1/2006 5:18 PM   
Villa



Posts: 1943
Score: 133
Joined: 8/12/2003
Last Login: 5/24/2013
From: Wilson, NC,
Status: offline 		What size aluminum channel are you using for the fuselage? I found aluminum channel too flexible for engines .46 and larger and decided to use 1 inch square aluminum with 1/16 inch wall thickness.

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RE: My 90 size SPAD - 2/2/2006 5:00 AM   
jamesg25



Posts: 89
Score: 100
Joined: 12/21/2005
Last Login: 4/15/2012
From: london, SINGAPORE
Status: offline 		the U channel on this plane is FAR from flexible its 1"x1"x1" and 1/8" thick real tough stuff

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RE: My 90 size SPAD - 2/2/2006 6:31 AM   
fxhobbies


 

Posts: 10
Score: 100
Joined: 5/28/2004
Last Login: 3/31/2010
From: Anywhere, AR, USA
Status: offline 		When I saw the long U-Channel, the first thing that came to my mind was a bad flexibility problem. But by using 1"x1"x1" U-Channel, you will eliminate almost all of the flexing. I am curious as to how you are going to mount the wing to the U-Channel. On our prototype U-Channel planes, we had a problem with the wing wanting to twist. We were able to solve this problem by running the U-Channel through the wing and still, .. we had to put a brace under the wing attached to the U-Channel to help stiffen it up. Even though this plane is no where near the size of your plane, .. this one has a 48" W/S, 32" U-Channel fuselage (7/8"x5/8") ... here are some pics of it to maybe give you some idea of what we did. I don't know if this will help you because we may have mounted the wing differently than what your planning on. This plane has a OS .46 LA which is the biggest I would dare to put on it. The total weight of this plane was 4 lbs. 5 ozs. which makes it fairly light and extremely fast. ... At least for me anyways. If you hit around 7 lbs. on your weight, with a .90 on it .. as streamlined as it looks, it should zip around the sky pretty good.

Regards,

Mr. FX

[image][/image]

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RE: My 90 size SPAD - 2/2/2006 3:56 PM   
jamesg25



Posts: 89
Score: 100
Joined: 12/21/2005
Last Login: 4/15/2012
From: london, SINGAPORE
Status: offline 		Hi FX
I'm planning to mount the wing by bolting two bits of L channel to the U channel to act as A saddle.
I will then take another piece of U channel and mount it on the L channel to keep the leading edge of the wing in place and use some bolts to secure the the trailing edge to the L channel.
here is a drawing to help explain my words



that FX-stinger looks pretty good but i cant see in your pics, the underside of the wing
have you any more?

and as with weight... i doubt that i'll make 7 pounds, i think that 8-10 is more realistic especially because i plan to have about 20oz of fuel on Bord...

best regards
James

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RE: My 90 size SPAD - 2/2/2006 5:34 PM   
The_Pipefather


 

Posts: 97
Score: 100
Joined: 11/16/2005
Last Login: 3/31/2007
From: Mysore, INDIA
Status: offline 		Dont you have rectangular aluminum extrusions available in your area? Like for example the one I use is 2" x 1" x 1/36 " thick (0.7 mm). It is much, much stiffer than U channel. Plus you get to mount your servos inboard, and the wing needs no support braces etc. Main landing gear can be mounted directly to the tube.

The best part is specific weight is only 3 oz/ft. This is much lighter than U channel or any kind of PVC. Only downside is crash resistance is very poor.

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