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HelicopterBeginners Corner › Rotor Speed
08-12-2007 05:06 PM  10 years agoPost 1
GYRO_NYC

rrApprentice

Grantham, England

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If the carb set up is approximately correct, how is rotor speed altered i.e. reduced for overspeeding / increased for 'under' speeding?

Is it all down to the Tx setting (throttle curves) and/or throttle trim or is the principal method by adjustment of the mechanical linkage?

If engine RPM can be set through a number of ways, what is the most basic and most sound method?

Thanks!

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08-12-2007 06:48 PM  10 years agoPost 2
oldboldpilot

rrKey Veteran

Southern California

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GYRO_NYC,

My experience is to set the throttle linkage at 90 degrees in idle, so you have rapid increase in rpm from there when you open the throttle.

I also think you want to rely on the length of the moment arm of the throttle servo arm to let you keep the travel adjustment to as close to maximum for your radio as possible.

From there, it's the combination of your throttle curves and your pitch curves.

If you post your heli, engine, etc, in that heli's forum, you can ask what curves pilots are liking..

Helis are Man's Defiance of the Laws of Nature - OCHC

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08-12-2007 08:05 PM  10 years agoPost 3
HHawk

rrVeteran

Gardnerville Nv.

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for the most part, every heli has a basic setup of lincages,the 90* rule. With the throttle links at 90*, and 0-full throttle with the ATV's at 100% in the radio is achieved, its all in the th-curves. You need an optical tach, either onboard or held by a second person to dial in the desired headspeeds. At this point a governor is the best way to achieve optimum performance.

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08-15-2007 03:40 PM  10 years agoPost 4
GYRO_NYC

rrApprentice

Grantham, England

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HHAwk thanks for the advice, re: onboard tach

any recommendations?

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08-16-2007 02:47 AM  10 years agoPost 5
HHawk

rrVeteran

Gardnerville Nv.

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I use the Model Avionics Sky Tach and a friend to spot for me. As far as on-board tacks, I wouldnt bother, since most run a governor after they set th-curves. And then the governor keeps it at the set RPM from there. I was really happy with the Multi-Gov on my Raptor.

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