throwing in the designing towel. :( - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-25-2012, 06:43 AM   #11
I am: Brendan G
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Re: throwing in the designing towel. :(

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Originally Posted by kip51035 View Post
Well here goes again! Basic design is all a system of fractions.
1. Use the wing as "1"
2. The fuselage should be 2/3 to 3/4 that length. Measured from prop drive washer to elevator hinge line.
3. The horizontal stab and elevator area should be 20% to 25% of the wing area
4. The fin and rudder area should be 7% to 10% of the wing area.
5. The width of the wing compared to the length is called the aspect ratio, 5 to 1 and 6 to 1 is a good place to start.
6. The thickness of the wing compared to the width should be between 12% and 16%.
7. The high point of the wing should be 1/3 the way back and that is where the C of G should be.
8. The C of G on the fuselage should be between 1/4 to 1/3 back on the fuse, measured from the prop drive washer.
9. The most important part of the wing is the shape of the leading edge.

I have used these ratios for years and made many A/C with them. They always fly great and I very seldom have to add lead.
Strange then how a flying wing or a foamie with no leading edge contour can still fly.

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Old 11-25-2012, 07:12 AM   #12
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Re: throwing in the designing towel. :(

A flying wing HAS to be more nose heavy, C.G. approximately 1/4 of wing cord not 1/3.
I made two of them and they flew Great.
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Old 11-26-2012, 06:06 PM   #13
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I am: Cliff S
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Re: throwing in the designing towel. :(

Originally Posted by AirDog View Post
Strange then how a flying wing or a foamie with no leading edge contour can still fly.

Just about anything will fly if you put enough power on it! Try gluing a soda straw to the leading edge with the tops flush and see what happens.

"If my being here has made your day a little more pleasant then I have done my job" Red Skelton 1913 - 1997 (famous Comedian)

Last edited by kip51035; 11-28-2012 at 08:52 AM.
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