ORIGINAL: Mikecam
ORIGINAL: cappaj1
ORIGINAL: Mikecam
I have the 7C and being new had no trouble with the th-cut feature. Use the end point on the throttle servo to set idle and then program the th-cut to close the carb just enough to stop the engine. This way if you hit the switch with anything other then idle speed the engine will keep running. Meaning at half throttle if you hit the switch you will hear the engine slow just a bit but because you are not at idle it will not quit. Remember though to set the switch back before flight, I left the th-cut on and couldn't figure out why my engine would not idle properly. I was ready to start adjusting the needles when I noticed the switch in the wrong position. If you forget the switch and turn the radio off and back on you will get a beep telling you the switch is in the wrong position. Getting close eh. LOL
Thanks for the tips. Just one thing I don't understand. If you use the end point of the throttle servo to set idle, how can it move behind that point to close the carb?
Well No expert but thats the beauty to the computer radio. The servo is not at the endpoint just the computer radio. You can close the carb completely with the endpoint but instead you back it off so it idles. That way the th-cut moves the servo that much more to shut the engine off and you can set that amount of movement as well. I tested mine so the th-cut would just close the carb, that way if you hit the th-cut switch while flying at say half throttle the th-cut movement isn't enough to stop the engine. Basically the th-cut amount of movement does not change whether your at half throttle or idle, just at idle the small amount of movement is enough to stop the engine while at half throttle it only slows it a little. I hope I'm not confusing you more. I know what I'm trying to say but not sure how to express it. I knew nothing 2 months ago and just worked on reading through the manual, at first it was very overwhelming but as you learn the simple things the more complex become easier. I kind of laugh at myself now for how I felt that I would never learn all this stuff. At first the manual can feel very complicated but take it one step at a time and it gets much easier. My first RC radio ever was a 7C so I had everything to learn all at once.
Thanks, Mike, for taking the time to explain. I too have alot to learn all at once. Glancing at the 7C manual on line, as I don't yet have the radio, is intimidating to say the least!
Sounds like what your saying is when you set up the airplane you move the servo all the way by moving the stick all the way down, then connect your linkage to the carb to servo. But the servo is actually not all the way down as the computer in the radio is smart enough to leave a little more travel for the th-cut feature. Am I getting it now?