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Model Forum / Radio Controlled / Air Models / April 2004Balance point on a flying wing??
Morning gents... can anyone point me in the right direction for a balance point on a flying wing. Planform is similar to a Zagi... cheers Papa Sharptooth Bouncing about the living room, my then three year old grandson declared himself "a kangaroo". "If you're a Kangaroo, what is Grampie", I ask. His reply: "you a dinosaur" > Morning gents... > > can anyone point me in the right direction for a balance point on a > flying wing. Planform is similar to a Zagi... A Zagi balances, IIRC, about 8 1/4" from the nose. However, not all wings have the same sweep and taper, and yours may differ. I think the Unicorn balances around 10" from the nose. Use TLAR and toss it a few times. Morris > Morning gents... > [quoted text clipped - 8 lines] > "If you're a Kangaroo, what is Grampie", I ask. > His reply: "you a dinosaur" Around 25-30% of mean aerodynamic chord from the LE at center span is a good starting point. Try this calculator to find the CG position for you: http://www.palosrc.com/instructors/cg.htm >Around 25-30% of mean aerodynamic chord from the LE at center span is a >good starting point. Don't quote me on this (or anything else....), but I think that's a good rule of thumb for a conventional plane only ~ The guys at my field who have flying wings claim that the CG must be much farther forward than this. Best advice I can offer is to find one that seems to work, (it just landed) and ask the owner if you can poke your fingers under it. DC3 >>Around 25-30% of mean aerodynamic chord from the LE at center span is a >>good starting point. [quoted text clipped - 3 lines] >The guys at my field who have flying wings claim that the >CG must be much farther forward than this. that's what I suspected as well which is why I asked the question. thanks. MY son built one from depron and normal 30 percent showed up as real tail heavy. we wound up hanging the battery much further ahead than I thought it should be. cheers Papa Sharptooth Bouncing about the living room, my then three year old grandson declared himself "a kangaroo". "If you're a Kangaroo, what is Grampie", I ask. His reply: "you a dinosaur" > >>Around 25-30% of mean aerodynamic chord from the LE at center span is a > >>good starting point. [quoted text clipped - 10 lines] > tail heavy. we wound up hanging the battery much further ahead than I > thought it should be. You guys are right. I was unaware of this difference. I just ran the numbers from my son's Wingwarrior Raider(a 48" span Zagi clone). The recommended CG range comes out to be approximately 20-22% of MAC. The info on this CG calculator: http://www.coloradogliders.com/centerofgravitycalculator.htm also says 20-25% of MAC for flying wings vs 30-33% for conventional craft. so I guess 20% would be a good place to start. |
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