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Old Oct 24, 2009, 06:36 AM
jaymak is offline
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radion control & retracts

Radio control systems and retracts ????
Newbe questions. Have a Lexor nova 6 plus. Instructions say channel 1 -4 are controls, speed, ailerons etc. But only say 5 and 6 button. Assume 5 and 6 are one function buttons I.E. on- off used for retracts. Correct or not?

This leadís to question two. Am building a Guillow B-17, and installing retracts. On the B-17 the gear does not go all the way up. Wheels retract into wheel wells but remain over half way out. Have worked out all the details save one. The retracts will not lock in the up position because they donít travel the full 90d distance, so will the servo hold them up or will it burn up the servo?
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Old Oct 24, 2009, 07:10 AM
Andrew McGregor is offline
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Well, retracts is one of many things you can use a switch-only channel for.

As for retracts not locking up... that's bad. It might fry the servo, or it might damage the BECs in the speed controllers, or it might run the battery flat, but whatever, it's likely to lead to a loss of control. You need that gear to lock. Probably the best way is to rotate the retract units a little so they lock up, and accept that the gear won't be quite vertical down, or move them down a little.

If you search the site, that plane must have been converted before, and someone will have done a retracts install, I'm sure.

Also look up about multi-engine planes and BECs: you can't assume that just plugging in two or more ESCs will work correctly.

Which brings me to another point: if this is your first plane, by all means finish the build, but learn to fly on something else first, because it would be a shame to waste all that effort on beginner pilot mistakes.
Old Oct 24, 2009, 08:11 AM
eflightray is offline
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An itch?. Scratch build.
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Have a look at this thread - Scratch-built Guillow's B-17 I think it may be the only one I have come across that mentions retracts in the Guillows B-17.

I'm not sure the project ever got finished, the thread just runs out.

You have a major project on your hands that few experienced modelers would like to take on. Good luck.
Old Oct 24, 2009, 08:53 AM
flypaper 2 is online now
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A normal retract servo shuts off when it gets to the end of its travel, also they rotate 180 degrees, but I don't think they make one small enough for your plane. A longer arm on your servo will give you more travel as long as it has enough power to lift the gear. I've used over centre springs to help carry some of the weight.


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