ImRich
Veteran
Location: Derry, NH USA
My Posts This: Topic Forum | Oops.. my mistake! By 0 and 100 I meant 0 and 100 % of servo postion! So that would be -100 and +100 ATV!  You figured out what I meant though! I went back and edited that post so I won't confuse anyone else!
With -75 and +100 it shows me that you are still not mechanically centered on your servo and carburator mechanical throws. If you are on the hole closest to the servo shaft, then you need to go out one hole on the carburator arm. You may even need a longer arm (if you have room for it). If you don't what you have will work, but see if you can get it closer to -100/+100. You should move your servo arm spline or two over to center the throw. Remember to get the carb 50% open when the servo is at half travel. To do this, be sure your throttle curve is set linear! If you like, write down all your current curve setttings, then set your throttle curve back to it's default straight line settings of 0 at the bottom, 50% mid stick and 100% for full stick. Also remember to have a 90 degree angle at both ends of the pushrod and the control arm. That's at the servo control arm and the throttle control arm.
Why do you want the governor to turn on at half throw of the throttle stick? On my X-Cell it turns on about 1/4 to 1/3 throttle. This seems to work fine for me and holds the govenor controlling the head speed though most of my flying in normal mode. In Idle-up 1 and 2 the throttle servo output is never below 20% so the governor never is disabled throughout the throttle range (which is what I want).
The governor will turn on depending on how your throttle curve is set.
If you want to confirm this, try the following. First write down all your 'normal' throttle curve settings so you wont lose them.
Then, set them all to the default straight line settings so that low stick is 0, half stick is 50% and full stick is 100% (I hope you did this when you set your mechanical throw also, but it's not as important as long as you were using 0 for the bottom, 50% for the mid, and 100 for the top points on the curve).
Now go back and check where your GV-1 will enable. It will probably be where the stick goes to 15% or 20%. But not at half.
Remember, from the GV-1's point of view, it doesn't know where the throttle stick is positioned, it knows where the throttle servo is being commanded to be positioned. This is controlled by the settings in the transmitter including ATV,AFR,Trim, sub-trim, throttle curves, and any mixing or other items which will affect the throttle servo output of the receiver.
On my transmitter I also programmed a switch to be able to disable the governor, this allows me to check my back-up throttle curves. I switch off the governor and listen for a change in head speed. It's a nice tool.
As a final note, if you really want your GV-1 to enable at half stick, then you need to change the throttle curve so that the servo output goes to about 15% at half stick. This would not be adviseable!! You want the proper throttle curve setup in case the GV-1 fails for some reason (a sensor failure, etc). When the GV-1 failes, it has a fail-safe of using the throttle position as commanded by your transmitter. If you don't have the proper throttle curve setup, you may not have a safe landing ! 
Oh, that reminds me! If you have a PCM receiver, be sure that your throttle fail safe setting is to place th throttle below the 15% point so that the GV-1 will be disabled if you lose your signal. You can test this by shutting off your transmitter and watching that the GV-1 shows OFF in the SWCd screen.
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Rich |
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