ORIGINAL: Puff The Magic Dragon
Ok thanks. One more question?? Since my wing is double tapered, do I enter the wing sweep or use 0, and treat it like a rectangular wing. I plugged in both and there is quite a bit of difference.
Rectangular Wing = 2.41'' to 2.89'' for 25% to 30% from root leading edge.
Sweeped Wing = 3.65'' to 4.13'' for 25% to 305 from root leading edge.
I use a quick n dirty method for this type stuff:
measure span (60")
1/2 span is then 30 "
and 1/4 span is 15"
measure in 15" from tip- and make two marks -one at 25% and one at 30% from leading eage -
do this on each panel
now connect the dots
this gives two straight lines,parallel from tip to tip
the CG should fall between them
Depending on speed o model -type of model wing loading of model - the "best " cg will be at front or rear of these lines
really light aerobatic - aft
really fast heavy model - front
I will bet you can't do it any better with a computer full of calculations.
CG is simply the " best compromise" location.