heli_headcase
Key Veteran
Location: Hovering around Atlanta
| | Quote |
| After you do your phasing adjustment, what does your static phasing test show ? With a blade over the tail and elevator input, does the blade change pitch ?
|
Yes, with the blade to be observed positioned directly over the tail boom and 'elevator' input given, there's a clear cyclic input to that blade.
Pure gyroscopic precession is 90° but as Super-Hornet also stated, ridged heads can skew that number. What's important is how the heli responds to cyclic commands, not that the phasing is exactly the theoretical 90° setting. But interestingly enough (slightly 'head scratching' too), I've flown very free flapping heads that also benefited from a -90 setting. I mean dead-free flapping. The head in question was a Kyosho Z61 "Swing head", similar to the K&S 818 of the early 1990's. But I removed the flapping coupling links so both blades were disconnected from the motion of each other, designed for extreme high-speed flight (over 100mph measured) and it too needed a phasing of around 70°. What else can I say? 
HHC
So many heli's - too little time... |
