Ray's Helicopter manual - Big Problems!
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Okay, fair enough. I'll agree that a lot of the full-scale theory he includes can be tough to plow through, but since it all applies to the flight characterisitcs of the models, it can be helpful to know WHY something does what it does.
If one already knows it (or doesn't care to know it), it could be a cure for insomnia...<G>
Steve