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"
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
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:
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
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"
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:
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