Paul, no thread, article by Lewis in Kitplanes. Just a thank you from me, he was promoting the rotary!

               Lewis, thanks for the recent Kitplanes read,

               Steve Carlisle


       I second that. Illustrates  the real essences of the real experimental air craft
       designing and building hobby.
       Not the pre-punched Ramp Vermin stuff.

       It is in the October issue. I'll scan it in a month or two.

       I am not surprised the Quickie with the wheels at the wings tips had on the
       ground directional stability  problems. Half the drag on a car at 50 mph
       is rolling resistance. That in turn is a function of load. If you load one wheel
       at the end of wing more than the wheel at the other end of the wing nothing is
       going to keep that airplane going straight. That is why a lot of Q2 builders
       moved the main landing gear inboard. Even a brake on the unloaded wheel
       will not help.

       I am sorry I did not think of that when you were building it Lewis.
       All that beautiful rotary engine installation stuff you did was just great.

       Paul Lamar

   Thanks for the kind words.
   That was a rough day...
   Still a huge fan of the engine. Despite the bitter ending, the Cosmic Fish was a tremendous education.
   The current conceptual airplane on my computer requires two rotary engines. It's based a little on the vought flying pancake and some of the bernelli designs.  I'll fly a large scale model of it next year.
    I've got a couple projects backlogged ahead of it, though

   Lewis. Bjork


   Do you have the classic book Theory of Wing Sections by Von Doenhoff?

   Page 8 CsubD = CsubL squared divided by Pi times  A
   A is the aspect ratio or span divided by cord.

   Very simple.

   Bad aspect ratio bad MPG :-) The reason Lindberg got across the ocean
   was he added wing span to the stock Ryan.

   You can down load it here for free.

https://aeroknowledge77.files.wordpress.com/2011/09/58986488-theory-of-wing-sections-including-a-summary-of-airfoil-data.pdf <https://aeroknowledge77.files.wordpress.com/2011/09/58986488-theory-of-wing-sections-including-a-summary-of-airfoil-data.pdf>

   Or direct from the Publisher Dover. See attached.

   Paul Lamar

Yes, I have that book.
Wing loading also plays a factor here. A light wing loading is how the Duke Delta gets away with it's very low aspect ratio planform.
I'm hoping for structural efficiency and high AOA benefits in a compact airplane.
There is argument whether the spiral airflow from the props actually counters wing vortices as claimed with the vought design, but the computer likes it, so far. That's why the model comes next.
Lewis. Bjork



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