Nick,
I have a mini electric RC helo. It works great for learning rotor physics because you can hold it in your hand and power it up, then tilt the rotor to feel the reaction.
I could not figure why the phase angle did not seem to be 90 degrees.
Then I noticed that it seemed to change at higher rrpm.
Your explanation confirms the real behavior I could feel and see in the model.
Thanks for that.
P.S. RC helo from Hobby Lobby called Aerohawk is about $200 complete with radio. Works well for hover. Electronic control died twice, so far they have sent parts.
www.hobby-lobby.com