Fred, By scaling the airfoil only in one dimension (since you want to keep the same chord length) you are essentially changing the airfoil and consequently changing the aerodynamic characteristics. I think you would need to work out the characteristics of this new airfoil to figure out what the washout should be. I would imagine washout would be the least of your worries with an untested airfoil at your wing tips.
Even if you keep the same airfoil shape (means you scale in both dimensions) the reduction in Reynold number would be enough to warrant an airfoil analysis and a washout to delay a tip stall. Ameet Savant Omaha, NE ----- Original Message ---- From: Fred Johnson <f...@renotruss.com> To: KRnet <kr...@mylist.net> Sent: Mon, November 23, 2009 1:31:52 PM Subject: RE: KR> wing design question Mark, I did mean same airfoil, just thinner profile out to the tip. Like say 18% at the root and 14% or thinner at the tip. All the same chord. The drag at the root would be slightly higher but would the lift be slightly greater also because of the thickness? You are correct, the AS is as good an airfoil as you could design based on the flight parameters of the KR. Fred Johnson Reno, NV
