Enterprise/ft.rucker ,al- home of army aviation
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The arguments about the 6 blades as opposed to 7 causing stress on the sysstem? I believe that may be nonsense. Is it meaning that if a 7 bladed head like you need was available that you would pass anyway?
As for run time, the amount of blades being run makes little if any difference. Weight, batt capacity, gearing and headspeed affect run time more. At least in my experience.
The 53 is going to be a costly build however you choose to do it. The importance of rotorhead accuracy will determine if u spend the money for whats correct as opposed to what will still work good enough. Nothing wrong with that either way, we build within our budget to our satisfaction :-)
drive a rotary, fly a rotorcraft