|
|
|
|
|
|
|
Ok...time for me to admit that I am an idiot when it comes to setting up throttle servos in an airplane. I have alwasy been able to do it and it works, but is there a recommended servo arm for a DA-100. The throttle servo is a 8611a (it was dirt cheap) and I am using a SWB 1.25" arm. What hole should it be in...what should the endpoints be....any other advice would be helpful to. Radio is a JR 12x...for what its worth. The particular plane is a QQ Python using the stock servo location. |
|
|
|
|
Pepatrick, I got this from Dean Nistetter: following is how I set up my carb servo linkage. I first set my transmitter ATV's to 130% for both ends of the throw. Then with the transmitter on I place the throttle stick in the center throw position. With this done and still on I set the throttle linkage such that the carb butterfly valve is roughly half way to full open (it will look like its at a 45 degree angle). This sets a good starting point to get everything mechanically linear. Next you'll need to adjust each end point of the servo throw through your transmitter so that at full throttle stick up the butterfly valve just reaches full open and at full throttle stick down the butterfly valve is just slightly open (showing a tiny bit of gap/air in the carb throat). If you have the mechanical idle stop backed off far enough you'll still be able to adjust your trim from this position to completely shut the butterfly valve and kill the motor. Once you start the motor for the fist time after setting this up you'll likely need to make some small transmitter adjustments for the end points to get the idle where you want it. I also program a transmitter switch to stop the motor by closing the carb without messing with the trim tabs. You can also accomplish stopping the motor by activating a choke servo if you use one. I actually set up both ways to kill the motor but deactivate them through a condition switch when I'm in the IMAC mode.
One other thing that I did in addition to what Dean describes is to measure the length of the carb arm from the center pivot point of the shaft to the center point of the servo hole. I try find a servo arm the same length (i.e. from servo center to hole center). Also, put a piece of masing tape on the carb insulating block and put a mark at full and idle points. This gives you a set reference points.
Good luck,
Bobby