Hi guys,

I'm building a 3.5 meter 747 400. See pictures posted on www.scalesoaringaustralia.com and go to the forum. (anyone can look it just a small club web site. The Fuz is nearly done. I need to calculate the wing lift verses cord including the washout etc. I will be using a different root and tip section. I need to know the stall speed for each part of the wing. A formula would be helpful and I can put it into a spread sheet. I was going to use RG15 root and Clark Y tip as it has worked before on a 4 meter U2. I want to know the true stall speed.