Jay--------------  I don't know of a max rpm for the Warp drive. I do know some 70 inchers will turn 2700 so I figure my 56 can turn 4,000.

 I have a  53 inch on my Dragonfly I cruise at 3500 and see 4,000 regularly. I think it's been that way for 25 years.

 One other thing, the NACA vent doesn't get any exhaust although the fuselage sure got dirty burning all the oil and crud I had in the cylinders.  Take care----------  Chris


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