When I last posted about the PiperJet, I said that it didn’t look right, though I added the caveat that the same applies to the F-4 Phantom II.

Well, it appears that my hunch meant something. Piper is looking at , modifications to the airframe to deal with pitch changes from changes in thrust. They have an automatic trim system to handle this, but they would like to eliminate this and use, “a Coanda effect device that would channel the jet’s exhaust in an appropriate direction to reduce nose-down moment created by adding power and nose-up trim changes when decreasing power.”

Basically, they are talking a poor man’s thrust vectoring, I think.