Myron (Dan) Freeman wrote: > OK, I'll try increasing the root wing incidence from 3-1/2 degrees as per > plans, to 4 degrees but keep the 3 degree washout and see what happens to > the lift.
I didn't say I'd go back to the plans' 3.5 degrees, and certainly didn't imply that I'd go even further to 4 degrees. That's too far, in my opinion, if you plan to fly at high speed and low altitiude. I was mainly responding to your issue of decreasing the washout, not changing the incidence. As for your "wind tunnel" tests, they do not match those of the multi-million dollar wind tunnel used by the University of Illinois at Urbana. The wind tunnel results output shown at http://www.krnet.org/as504x/repeat_1m.gif shows that at zero incidence, the AS5045 (which is what the airfoil templates use at the tip) still has a lift coefficient of .3, which is a considerable percentage. There is a lot more information on the design of this airfoil located at http://www.krnet.org/as504x/design.html . You may not have seen it... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net
