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?

Kamen K-225 color jpg in museum:

http://www.neam.org/images/k225_lg.jpg

Rob