Here is my response to a skeptical email that I received.

Who is going to cut a 3" diameter hole in their glider for the PP duct egress? Surely you jest.

I forgot to mention in my first post that the PP duct necks down to 1/2" I.D. after the ducted fan. This reduction in diameter increases the velocity of the flow so the P flies even further from the plane.

https://www.motionrc.com/products/fm...AtlsEALw_ wcB