zenoha 231 rpm range

[wingtip]

can someone tell me what the range is for this motor, the horizon site says 3-11, tim at min says they dont make power till 13k, i need to know some specifics as im trying to choose a gear ratio for 4 bladed head at 800mm, so i dont wanna run it redlining all the time if i can help it :glasses:

[bigrcr]

The stock G-231 operates in a range from 11,750 to 13,000.
It will still make adequate power in the range of 11,750-12,250 but the best power to user friendly range for the stock motor is at 12,500- 12,750. The motor becomes slightly taxed above 13,000 as it likes to run at that RPM, but it starts to get a harmonic above 13,000 that will do subtle things like melting the plastic skid spacers.

The TRM G-231s stage one modifications push the curve upward a bit. This motor will operate as low as 12,000 happily, but really likes 12,500-13,250 best and makes much more power than the stock motor. The power curve for the TRM is also broader meaning that it can pull the power back-in when then RPM is either within the "happy range" or most importantly outside of this range and quickly gets power back up to current demand. This happens without getting into a subtle harmonic as the stock motor may.

Note: both of these motors will operate much higher than 13,000 RPM and without a motor operability issue at all with the TRM G-231. Some issues can arise with harmonics that can excite parts on the model. Of course the modified motor can handle much more RPM than the stock for this reason (or should I say the model can handle it). All of these motors will find an unhappy spot in RPM where this can happen. The secret is to make sure that the motor is designed so that it operates in the area (RPM) that this does not occur. The motor can be balanced for the operating RPM which would leave any harmonic producing RPM outside of this band.

Other factors can also play a smaller part in where the motor likes to operate such as gear ratio. The gear ratio determines how this RPM is applied to the model and can push the curve a small amount. If the gear ratio either loads or allows the motor to be always unloaded this can change the characteristics of the motors operation a bit. Heat can be generated by this that will cause the motors "happy curve" to be changed.
Motor cooling is another factor, but I will stop here!! :arggg:

Hope this helps!

[laserfly]

How come that the Zenoah manual (G231PUH) says Adjust to 9,000-10,500 RPM (for helicopter use)...?

[bigrcr]

Komatsu/Zenoah do not really (until recently) know how these motors will be used. They do know that the motor is intended for model helicopter use, but do not understand the loads, etc. that the motors will be subjected to. They published figures that were "normal" when the motors are used in a model airplane.

Later,