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Radio System FAQ
I am setting up a twin engined-model and want to be able to command the engines separately at certain times. Specifically, I always want the engines to respond only to the throttle stick (never any knobs or other items), and I want the left engine to operate alone if the C switch is in the up position with the right engine at idle; the left and right engines operating together in the C center position, and the right engine to operate alone in the C down position, with the left engine at idle. Can I do this?
Absolutely! Like most things with the 9C, there are many ways to tackle this task. We've given you 3 options here. There are many more.
A. If you do not need all of the extensive pre-set programming in the radio for acro mode, you can simply select a helicopter mode, then plug the second engine servo into channel 6, the collective pitch channel. Now throttle hold will put the channel 3 engine to idle, and an idle up can be used to put the collective pitch channel to idle.
B. The easiest approach we can offer you to do this utilizes 3 of your seven available pmixes.
left engine throttle servo plugged into channel 3
right engine throttle servo plugged into channel 7
- Create a pmix mixing THR to 7, 100%, switch C positions center and down:
| ___ | Press Mode Button (twice if needed) to open Advanced menu |
| ___ | Turn Dial up or down and Press to select an open pmix |
| ___ | Press Cursor Twice and then turn Dial left to activate mix |
| ___ | Press Cursor Down once to go to MASTER |
| ___ | Turn Dial until reads Throttle |
| ___ | Press Cursor Down to SlaVE |
| ___ | Turn Dial until reads Aux 1 (channel 7) |
| ___ | Cursor Down and leave Link OFF, Set Trim ON |
| ___ | Cursor Down to Switch and select Switch C |
| ___ | Cursor Down twice to switch POSItion and turn Dial until reads Ctr/Dwn |
| ___ | Cursor Down, move throttle to bottom, and set % to 100% |
| ___ | Move throttle to top and set % to 100% |
| ___ | Cursor DOWN to leave offset 50% and press End twice to close menus |
- Left throttle operates properly on the throttle stick already with no changes needed, so that is the up switch position for the channel 3 servo. However, the channel 7 servo needs to be brought to idle, or kill, or however you want it set up. We'll assume you want it to idle. To do so, offset mix channel 7:
| ___ | Press Mode Button (twice if needed) to open Advanced menu |
| ___ | Turn Dial up or down and Press to select an open pmix |
| ___ | Press Cursor Twice and then turn Dial left to activate mix |
| ___ | Press Cursor Down once to go to MASTER |
| ___ | Turn Dial until reads OFST (offset) |
| ___ | Press Cursor Down to SlaVE |
| ___ | Turn Dial until reads Aux 1 (channel 7) |
| ___ | Cursor Down and leave Link OFF |
| ___ | Cursor Down to SWitch and select Switch C |
| ___ | Cursor Down to switch POSItion and turn Dial until reads Up |
| ___ | Cursor Down, set % to 75% (reverse direction if needed to operate properly) |
| ___ | Press End twice to close menu |
- Now, we need to operate the channel 7 throttle but not the channel 3 throttle when we move the throttle stick while in the down position. To do so, we do a pmix of throttle to throttle, -100% each direction, link off, trim off, offset 0%, switch C down.
| ___ | Press Mode Button (twice if needed) to open Advanced menu |
| ___ | Turn Dial up or down and Press to select an open pmix |
| ___ | Press Cursor Twice and then turn Dial left to activate mix |
| ___ | Press Cursor Down once to go to MASTER |
| ___ | Turn Dial until reads Throttle |
| ___ | Press Cursor Down to SlaVE |
| ___ | Turn Dial until reads Throttle |
| ___ | Cursor Down and leave Link OFF, Trim OFF |
| ___ | Cursor Down to Switch and select Switch C |
| ___ | Cursor Down to switch POSItion and turn Dial until reads Down |
| ___ | Cursor Down, move throttle to bottom, and set % to -100% |
| ___ | Move throttle to top and set % to -100% |
| ___ | Cursor DOWN and pull throttle stick AND TRIM to bottom, press and hold DIAL to select this as the "offset to" position |
| ___ | Press End twice to close menu |
- We need to turn off the channel 7 knob to avoid its position affecting your right engine. This is easy with the 9C, simply go to the Aux Ch, go to channel 7, and set to null.
| ___ | Press Mode Button (twice if needed) to open Basic menu |
| ___ | Turn Dial up or down and Press to select Aux Ch |
| ___ | Press Cursor Twice and then turn Dial left until reads CH7 NULL |
| ___ | Press End twice to close Menu |
- At this time you will need to reset the throttle trim to 0%.
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