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Old 11-20-2010, 02:21 PM   #11
Phil Noel
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I am: Phil N.
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Re: Another good reason for negative pitch !!!

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As for the amount of negative pitch a novice should set into his heli one must understand these five things:

1 - Any amount of pitch less then what is required to hover the heli is still air will cause it to descend.

2 - Any rotor speed that is less then what you have in the hover in still air will will cause the heli to descend

3 - Any translational lift, be it provided by a wind or the movement of the heli in forward flight will provide additional lift.

4 - Any negative pitch that is more then it will take to hover inverted will generate forces that will DRIVE the heli down when applied during upright flight.

5 - Just as a bigger cyclic range will result in harder cyclic response, so will a larger collective range result in a harder collective response.

Knowing and understanding these relationships will make it easy for you to adjust your heli to be more docile for training, smoother for Scale or FAI, to have faster response for 3D or lightning response for extreme 3D.

IMHO, the first thing that must be set is the power system so that it gives a constant rotor speed from hover, to full climb, to whatever one chooses as bottom stick in an idle up mode. One should only use your normal to get the engine or motor up to hover speed and then switch to the properly set idle-up mode.

So if you do NOT want to be push your heli into the ground when training, considering #4, you certainly do not want more then say -4 degrees of negative.

As a beginner will probably not be flying in any winds of consequence and he will not be having to descend from forward flight, he may find that the softer collective that a -1 or -2 setting gives him more time to react collectively, and later when he goes into forward flight he can drop that to -4.

Also, a novice may find that using less top end pitch initially, will also make the collective softer and easier to manage, so dropping from 10 or 12 to 8 or 9 may be beneficial.
Phil Noel
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