Steven Butler Posted September 30, 2011 Share Posted September 30, 2011 Hi I have just put together a phoenix mustang with mechanical retracts. Initially I could only get them to lock in one direction only. I tried to adjust the servo travel in the servo set up menu and no matter how much i adjusted it the servo did not move despite the tx monitor showing an adjustment as I rolled the wheel and the value changed. I have solved the problem now by simply fitting a longer servo arm to give more trave lbut i would still like to know why the servo did not adjust when I tried to change the servo travel via the Tx. Any help gratefully received. Steve Quote Link to comment Share on other sites More sharing options...
Pete B Posted September 30, 2011 Share Posted September 30, 2011 If it's a dedicated retract servo there will be no electronic adjustment available, Steven. They move to predetermined limits and that's it. You can only adjust them mechanically using either the servo arm length as you've done or by adjusting the linkage lengths.Pete Quote Link to comment Share on other sites More sharing options...
Steven Butler Posted September 30, 2011 Author Share Posted September 30, 2011 Thanks for that. It seems strange then that the dx8 has this adjustment. Can you therefore use normal servos for retracts and therefore get the required adjustment using the tx. Any how thankyou for the reply. At least they are all working ready for the maiden flight tomorrow. Steve Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted September 30, 2011 Share Posted September 30, 2011 as said, the retract is non-proportional, now then, you have linked the retract servo to its own battery pack, havnt you? most important, if the leg bends back, and fowls the wheel well, the radio battery will be drained quicker than the wife spending a tenner Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted September 30, 2011 Share Posted September 30, 2011 Steve, you could use a regular servo, but as they only turn through roughly 90 degrees you wouldn't be able to get the servo to lock out. Retract servos turn through around 185-190 degrees so they are self locking. On top of that they are often low profile to fit in the depth of the wing. They also have very sturdy gearsets.The 'retract channel' is just another channel, you could use it for flaps, gyro rate or anything else you like, hence the provision of the usual adjustment As Alan said, use a separate battery! Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted September 30, 2011 Share Posted September 30, 2011 just google running retracts from a seperate battery, it only needs a Y lead, and a spare switch, Quote Link to comment Share on other sites More sharing options...
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