Charles Gray wrote in message . ..
When was the earliest turbine powered helicopter? I khnow that the
turbine is far more effective than an IC engine.
Also, what was the delay? Was it just a matter of nobody really got
around to it, or were there power/reliability issues with the
turbines?

Kaman K-225:
http://www.nasm.si.edu/research/aero...kamen_k225.htm

Rob