SkyDemon Forums

W and B polygon again!!

http://forums.skydemon.aero/Topic9776.aspx

By barne_as - 7/3/2013 7:19:15 PM

Hi all,

Im struggling to create the WandB polygon for my new group aircraft.

Its an AA5a and the graph in the POH is of Moment/1000 vs Loaded weight in Lbs.

The POH shows almost a parallelogram with points at:

120,1500, 139,1500, 204,2200, 189,2200, and 145,1780

Ive looked through all the other aircraft documents and cant find any other WandB chart

Can anyone help me please?
By stevelup - 7/3/2013 11:10:17 PM

If the graph in your POH is a parallelogram, then it is almost certainly a moment diagram rather than a CG diagram.

You should be able to convert it into a CG diagram (which is what SD needs) by multiplying each moment figure by the weight.

Have a look at this thread:- http://skydemon.aero/forums/Topic9348.aspx