I have noticed this tendency as well, particularly evident on the UH 60.
To roll right, as you argue Crab, the CL changes roughly the same on the right as the left, albeit in oppposite directions. It is your assertion that they therefore equal out that I dont agree with. For example, when you roll toward the retreating blade in forward flight, you require more power, and this “roll induced torque spike” is readily demonstrable. This is because the reduction in drag created by the reduction in lift (AoA) on the retreating blade is exceeded by the increase in drag created by the increase in lift on the advancing side. This has the overall net effect of increasing total rotor system drag, thus requiring more torque until the roll rate stops. The imbalance is due to the fact that V is squared in both the lift and drag equations, thus the effects of changing AoA between the advancing blade and retreating are disproportionate. The V squared creates an exponential curve, not a linear one, and if I could remember the correct chart to use, it can be plotted out and demonstrated diagrammatically. Damn those memory cobwebs.
Do you think that this roll induced torque spike may have anything to do with your roll rate question? It would seem logical (though most helo subjects ARE NOT
) that it would be easier and faster to roll in the direction of less power. Same as it is easier to begin a rate of descent, than it is to start a climb.
Sorry if I have confused the issue.
