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Will the throttle hold and throttle cut switches on my radio override the governor independent of the throttle/collective stick position?
Absolutely. Governor function in the 8U and 9C know to shut off and not be active in your throttle hold condition. In the 9Z, you would set the governor control channel to the off position in throttle hold.
What servo do you recommend for the GV1?
The GV-1 asks a lot more of your throttle servo than flying without one. Therefore, a higher quality, ball bearing servo with a speed of .18/60 seconds or faster is preferrable. For example, the S9101 is a good choice.
How should I set my throttle curves when using a governor?
If you are using a separate on/off switch which is not assigned to your engine cut switch, you MUST set up fully functional, normal throttle curves incase you are ever in flight and accidentally turn the governor off when you do not mean to. Additionally, it is always a good idea to have a throttle curve in place should the governor magnet come dislodged or other failure occur. Lastly, a proper throttle curve is imperative if using the stick switching function in idle up conditions to keep from turning the governor off when you are inverted and go into the last 15% of down stick.
What is a governor?
A governor reads the head speed of the rotor and adjusts the throttle electronically to keep the head rotating at the programmed head speed. This way, the collective stick is really only adjusting blade pitch, and the governor is controlling the engine to maintain the optimum selected head speed for consistent performance.
How do I set up a GV1?
Begin with the GV-1's manual, available at:
From there, also see your specific radio's manual. For example, the 9C manual has a full 2-page section on governors and setup.
Lastly, please read the remainder of this FAQ section for additional assistance.
How should I set my throttle curves?
If you are using a separate on/off switch which is not assigned to your engine cut switch, you MUST set up fully functional, normal throttle curves incase you are ever in flight and accidentally turn the governor off when you do not mean to. Additionally, it is always a good idea to have a throttle curve in place should the governor magnet come dislodged or other failure occur.
If I use the stick switching can I still fly inverted? Do I ever HAVE to use stick switching?
Stick switching operates based upon the actual COMMANDED throttle position, not the throttle stick position; therefore if you are in an idle up even though your throttle stick is pulled all the way back, IF you HAVE A PROPER THROTTLE CURVE SET UP FOR YOUR IDLE UP (so that the commanded throttle position is not 0), your engine's throttle is commanded to be wide open by the throttle curve and would not shut off the governor.
If you are using it with a radio which doesn't have a spare channel for switching you MUST use stick switching (to be able to turn the governor off) or else use one of the 3 speed positions as off. Remember, regardless, you should always set functional throttle curves as a back up.
What does +Limit and -Limit mean on my 9C in my governor programming?
If you choose to use a second channel as an on/off for the governor (the other option is to just use a single channel and have one of your 3 head speeds be "off"), then the second channel turns the governor on and off based upon a switch, and also tells the radio to turn off the governor automatically when you go to throttle hold.
The +Limit/-Limit feature simply reverses the directionality of the "off command" for throttle hold. When testing, try your throttle hold switch. If the governor races the motor to maximum setting rather than minimum, then the limit direction needs to be reversed.
Should I assign my 3 head speeds to the 3 conditions of my radio (idle up 1, 2, and normal) or should I have the head speed switch separate from my conditions switch?
It is nearly always preferable to have your head speed be changed automatically with your condition, and the logic behind this is simple. If you change the rotor pitch without a change in head speed then you are either over-working your motor (bogging down) or under-utilizing it as the load on the motor has changed but the end result—the RPM—has remained the same.
Can I adjust the speed settings in flight?
You can utilize a mix to adjust the RPM speed in flight, yes (mixing an empty channel which is on a dial to the speed channel, or with a 9C using a dial mix). However, note that doing so is really only ideal during the setup period. Again, once you have reached the optimum head speed and pitch curves for your model, you want to keep the head speed directly tied to the pitch curve and not adjust it, changing the load on your motor from the ideal setup you have created.
Can I use the GV1 with an in-flight-mixture system?
Absolutely. The GV1 has programming just for this feature.
What does max speed display do?
This feature stores the highest RPM reached by your engine at any time during the flight. It measures only if your throttle stick exceeds 95% of the total throttle throw. It is a good idea to check this reading during early set up and occasionally afterward to ensure your engine is not being over-revved by the governor.
Does the governor know what to do in throttle hold?
IF you use the stick switching function, which reads the actual throttle carburetor command and not the throttle stick position, then yes. The governor sees throttle hold as going below the 15% point, and shuts itself off.
If you are not using the stick switching function, then the only way for the governor to know you want it off in throttle hold are:
a) Put the on/off switch on your throttle hold switch (not recommended as you have no way to turn the governor off without being in throttle hold).
b) Turn both switches off together in flight whenever you go into hold.
c) Using a 9C radio, tell the 9C's software that channel 8 is your on/off in the governor programming. The software will then automatically turn off your governor when you go to throttle hold. Basically, the radio is doing option D for you; or
d) Create TWO mixes within your 9z's throttle hold condition (8-channel users: in your case, both mixes are assigned to the throttle hold switch) which are both:
master = offset
slave = ch 8 (the on/off channel)
percent = 100%
switch (same as throttle hold in the hold position)
(Why do you need two mixes? A 100% mix moves the servo from center to one extreme or, in this case, from one extreme—ON, to center; the second mix moves it from center to the other extreme—OFF.)
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