Discussion How to set head speed?

[raptor fan]

Hmmm...,Would those same curves of 100% straight across work in a nitro also? It seems like in everything ive read, You want to have kinda a v shape in idleup 1 as to kinda keep your head speed the same threw out. Whats the difference in idel up 1 and idle up 2? I know the head speed is higher in idleup 2.Do you need to have a really fast throttle servo if you have a govenor?

[Roto Rob]

On a nitro, 100% straight across throttle curve is not a good idea. The nitro motor at 100% throttle will try to increase rpm until it can't (load to high), or self destructs (at less load).
The electric motors are fairly well self regulating on speed. If the motor, and gearing is selected for a head speed at 100%, it will try its best to stay near that RPM.
The Governor setup is different also. On a nitro governor I set regular throttle curves. The governor rpm is set on a different channel or on the governor itself. For 3D you target a headspeed a few hundred rpm over the peak power. That way it bogs down into the peak power rpm. The governor uses the throttle curve up to about 20% throttle, it then switches to the governor channel setting. If the sensor goes bad the governor drops out, and falls back to the throttle curve. So the throttle curve is now critical. I have used many not so fast servo's on throttle with good results.

The Electric esc's governor is all through the throttle channel. There is no need for a fall back curve. A V shaped curve can give a little more pop in governor mode, but some esc's don't like there target rpm being changed. Best to keep it at one setting unless you have a good esc (most have to be tested to find out, since many name brands are lacking.)

The V curve in idleup (without a governor) is needed to keep the rpm constant, since the load varies. But with the electric you can get away with running it flat out 100% by gearing it for the desired head speed. Many ESC's are also happier running at 100%.

Difference between Idle 1, and idle 2 is how you set them. They are just additional flight modes.

[cmulder]

i fly castle creations (lower cost) and kontronic (my performance helies) esc in govonor mode.
My "trottle curve" is a horizontal line at ussaly 90% to give the esc "room" to compensate.
The trottle hold switch becomes the motor on/of switch and the spooling up part is done by the esc.
Head speed is the kv of the motor times the voltage of the pack (ussaly 11.1) times the number of theeth of the motor pinion and that all devided by the number of theeth of the mean gear(asuming you have a single stage gear reduction)

[raptor fan]

Thank you Rotor Rob! That helped alot.

[Tweener]

Oops.