Thanks for the input da...
The fun thing about this hobby is what you can learn about aerodynamics in the pursuit of building the "perfect" airplane...
And over the past years, I have learned a lot from reading this forum.


I have the cooling intake exhaust ratio set up at a 1.4:1 ratio as per the section of Andy Lennon's book that talked about cowls.
One comment he made was about the Hawker Hurricane cooling setup and how it was designed to add thrust while in flight. That and some of the examples he used suggested that you might be able to design a setup, where as best as I grasp it you have a thermal engine. Hmm interesting.... That is why when you look at the side view of the ducting a pipe springs to mind, or perhaps a rocket combustion chamber and nozzle. Yea I know really a reach...
With the four stroke it would be very easy to pipe it with off the shelf components. The stock exhaust could be easily modified to be piped, and to be honest with you I am still bouncing back and forth on which engine to use. I have an OS 70 four stroke, and an OS MAX 55AX, they both are almost identical in weight, size and performance, and it would be neat to really go full out to make it look as sleek as possible. All this not for speed but but having a very clean airframe to get the best flight time out of a tank. Not to mention having a plane that looks cool, a really nice fun fly maxed out. Why just because you can do it....
And given the broad envelope I want the plane to be able to fly in, a neat experiment if nothing else.
I'll be sure to give a report on the results...

P.S.
I am going to see if I can get one of our more experienced pilots do the maiden. lol