| I have just acquired a 2nd hand, excellent condition, electric "old timer" | style aircraft from a very experienced flyer. The aircraft came without a | receiver and I'm told my current TX/RX are fine (Hitec Flash 5X and Super | Slim 7 channel RX).
It's also possible that it doesn't have a throttle control at all -- some electrics just run until the battery dies.
| So, can anyone explain where the magical 3rd throttle channel comes from and | how I should connect everything to my RX? Ah Hah! Just noticed that the | speed controller may double as the RX power supply lead. Can this be | connected to any of the RX channels (I've remember hearing comments this is | possible)?
Sounds like you do have a speed controller, and if so, then yes, it goes into the throttle channel. Which may vary from radio to radio.
But that's ok -- it's easy to figure out via trial and error.
| I won't try this until others confirm it, for fear of smoking the | RX.
As long as you don't reverse the polarity on the ESC plug, you'll be ok. You can plug any servo into any channel without damage, but if you get the polarity of the ESC plug (which also provides power) backwards you may fry something. Red -> +, Black -> -, and the remaining wire is the signal. Depending on the plug, you may not be able to put it on reversed at all, but it's best to be sure before you apply power (lest you risk releasing the magic smoke.)
To figure out which channel is what is easy. Remove the prop -- you don't want it biting you. Plug the ESC into channel 1, and your two servos into ch 2 and ch 3. Wiggle your sticks, see what moves. Adjust things until the right control surfaces move when you move a given stick.
Once you've done that, you'll also have the ESC in the right plug (it can provide power on any slot, but only one will have the right stick control it.) The motor may not go, however (but it might -- which is why the prop is off.) If it's not going, put the throttle to the minimum setting and disconnect and reconnect the plane battery. If it still doesn't work, reverse that channel, and disconnect/reconnect the battery again, making sure it's still set to zero throttle. If things still don't work, check that the battery is fully charged.