View Full Version : head speed checking methods question

12-04-2006, 05:32 PM
A couple of questions re head speed checking.
is it possible to check the head speed with out the main blades fitted by "clocking" the Paddles with the revcounter?


on a raptor 30 what if you checked the tail rotor rpm?
that should work would it not? by what would you multipy or divide the tail rotor speed to get the head speed?


12-05-2006, 03:19 AM
not sure what you mean by fitting and clocking?...but I'm a

I have an optical look through a view finder and tune a button until the blades visually stop...a readout tells you the speed..

the tail blades move 4 times faster usually

mine is "kinda" like this one

12-05-2006, 06:06 AM
/me giggles...

12-05-2006, 11:40 PM
blades on- at any pitch angle, will affect load therefore voltage to the motor, so for best results do it with them on.

otherwise do it without them on and apply a fudge factor to account for the low loading condition.

12-06-2006, 12:02 AM
yes...sorry...I didnt read it right as well as didnt understand it...I must have been asleep...

you will over rev the motor without blades on...and we generally check the headspeed at hover and under load..or... with an optical tach you can check it and how it loads even in 3D flying ..