Turbine RC airplanes are limited to 200 MPH fixed wing RC and 100 mph for Control Line.

Choppers with turbine s are limited to 2000 RPM rotor head or mfger.'s limit if less.

Night flying requires less than 100 mph and turbines are prohibited from night flying. Check AMA documents.



Actually as you stated the question, ".... speed limit on the AMA?", the AMA doesn't need a speed limit as even the snails out perform AMA's speed, with the exception of increasing the bureaucracy which is rather rapid.