Diablo wrote in the "Taurus engine prices" thread:

>>A rotary valve or a reed valve engine both have good potential for top end horsepower

Yes, a reed and rotary valve can be tuned to produce great high RPM horsepower.....but this is not the strength of either of these designs, their greatest strength is producing power over a wide power band. In other words, relative to other engine designs, you can get great peak power without sacrificing all your mid-range power. What that means in r/c applications is (theoretically) you can tune the good peak power for wherever target RPM range you want, without having it being a peaky motor.

You have said before, as you imply here, that our motors don't need low end torque, only power over a very narrow band. I say again, I don't agree. A wide power band from down low to your peak is essential for good throttle response and fast acceleration to peak RPM, such as pulling out of a hover.