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scoreshot · 06-18-2014, 07:28 PM

Rebuilt my 300x. Replaced servos with 3 Turnigy TSS-10MGs and a TGY-212DMH on the tail. Ran thru SETUP and PARAMETER all was well. First few flights were just fine, no problems, very smooth, with stable hover. No crashes. Now it will not lift off!! Rechecked ALL settings. No sheared bolts, pinion secure, servos very strong against moderate resistance. All systems ck out on bench test.

Should I fear a 7200 problem...

Any help greatly appreciated.

puppydog_taz · 06-18-2014, 08:49 PM

Put throttle hold and check the pitch. This is assuming your throttle hold pitch curve is 0 - 100.

scoreshot · 06-18-2014, 10:48 PM

Thanks for your reply puppydog.
Yes I have done that. Everything checks out "on the bench", I;m thinking it must be a weak or failing servo when under load. Going to remove and ck em out completely.

James Recard · 06-18-2014, 10:56 PM

Disconnect two motor wires and check pitch

scoreshot · 06-19-2014, 12:23 AM

Yes I did that several times. The problem was in fact a bad Elevator servo. Glad I bought 4 of them. These Turnigy TSS-10MG looked pretty good on paper. Wasn't sure of the right frequency so I was running them at 120Hz. Reset them to 50Hz to be on the safe side. 3 packs so far and all is good.

06-18-2014, 07:28 PM	#1 (permalink)
scoreshot Registered Users Join Date: Apr 2009	No Lift Off Rebuilt my 300x. Replaced servos with 3 Turnigy TSS-10MGs and a TGY-212DMH on the tail. Ran thru SETUP and PARAMETER all was well. First few flights were just fine, no problems, very smooth, with stable hover. No crashes. Now it will not lift off!! Rechecked ALL settings. No sheared bolts, pinion secure, servos very strong against moderate resistance. All systems ck out on bench test. Should I fear a 7200 problem... Any help greatly appreciated.

06-18-2014, 10:56 PM	#4 (permalink)
James Recard Registered Users Join Date: Oct 2013	Disconnect two motor wires and check pitch __________________ Anything worth doing, is worth doing badly.

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06-18-2014, 08:49 PM	#2 (permalink)
puppydog_taz Registered Users Join Date: Oct 2007	Put throttle hold and check the pitch. This is assuming your throttle hold pitch curve is 0 - 100.

06-18-2014, 10:48 PM	#3 (permalink)
scoreshot Registered Users Thread Starter Join Date: Apr 2009	Thanks for your reply puppydog. Yes I have done that. Everything checks out "on the bench", I;m thinking it must be a weak or failing servo when under load. Going to remove and ck em out completely.

06-19-2014, 12:23 AM	#5 (permalink)
scoreshot Registered Users Thread Starter Join Date: Apr 2009	Yes I did that several times. The problem was in fact a bad Elevator servo. Glad I bought 4 of them. These Turnigy TSS-10MG looked pretty good on paper. Wasn't sure of the right frequency so I was running them at 120Hz. Reset them to 50Hz to be on the safe side. 3 packs so far and all is good.

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