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Cactus. -> Scratch built, foam delta. Where should the CG be? (5/23/2002 1:43:47 PM)
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my rule of thumb, never failed me yet
work out the CofG as per normal planes. all flying wings must be forward of this point. work out 5% of your root chord. move your CofG forwards by this amount. this is the MOST! you can go rearwards, in real terms i use 8% to be safe
how do i work out where the normal CofG should be?
i draw a line 1/3 of the tip to 1/3 of the root.
i then take a line 1/3 of that line and join that to 1/3 on the other side. 1/3rd meaning if you start from root and work down towards the tip.
it depends on how much taper i have wether i stick to this or move forwards a bit, but its always somewhere near the CofG if you where just dealing with the root, just behind it.
i cant be bothered to get out a calculator but i've never been far off the money so far
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