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HelicopterMain Discussion › Did I fry my servo?
03-19-2009 03:44 AM  8 years agoPost 1
splitboarder

rrApprentice

San Diego,​California

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Im using a futaba 9254 tail servo with a 401 gyro on a Trex 600E I have a secondary pac for the electronics thats 7.8 vots. I forgot to use the in line step down regulator and flew 4 flights at 7.8 volts on the servo.

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03-19-2009 03:50 AM  8 years agoPost 2
dave75d

rrKey Veteran

Jacksonville, FL

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doubt it, id be more worried about the gyro. do you smell anything burning? if not, you're in good shape.

ten grand in helis and all i can do is hover

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03-19-2009 03:52 AM  8 years agoPost 3
Furious Predator

rrProfessor

Kitchener, Ontario,​Canada

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a step down is just a diode and will only drop your voltage by 0.7 Volts. you have a little ways to go with 7.8, and thats a nominal voltage. i also dont believe the 401 itself can handle that kind of voltage.

if your servo still works, its not fried, but you may have shortened its life.

Shawn
Team Leisure-Tech
Team HelixRC

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03-19-2009 03:54 AM  8 years agoPost 4
Dood

rrProfessor

Wescanson

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Give that servo a GOOD testing on the ground before you think about using it again.

I had some 9252's I killed once running a 9.6v pack into (on the bench).(it's embarrassing and would rather not go into detail)

After I caught my mistake and went back to 4.8v, the servos lasted another 3 or 4 minutes on the bench, and have been toasted ever since. (I still keep them around as a reminder not to run 9.6v into a 4.8v servo)

I think you are the 9254 lasted as long as long as 4 flights.
If it's not dead by now, I'd bet you shortened the life of the servo significantly.

Test it on the bench, and if it's OK after a while, I might just go with it.
But I think the WISEST thing you could do is send it to Hobby Services and tell them what you did to it.

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03-19-2009 04:00 AM  8 years agoPost 5
Heli 770

rrProfessor

USA.

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I think the 401 starts to fry at 6.5volts.

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03-19-2009 04:45 AM  8 years agoPost 6
splitboarder

rrApprentice

San Diego,​California

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I didnt smell anything but here is whats going on . The heli spins up and hold good untill the head speed is enough to unweight the skids. The tail holds then kicks clockwise about 5-10 degrees then holds....then kicks and if I keep the head speed at the same amout so the skids are unwighted but the heli is still on the ground it will eventually go a full circle

I have taken my 401 from my 450 and swapped it out , no change. I replaced the gears on the servo no change. The servo I changed the gears on had the step down (output to tail servo is 5.1 volts with in line step down)installed and with that servo the tail started its problems

I then bought a servo from a runrder member put it in and flew 3 flights .This servo is the one I forgot to install the step down and flew for 2 batteries and then it started twitching again. But, when I took it to the LHS it didnt do it The guy at the LHS s says there was some binding on the tail shaft and I bought a new slider so I hope that is the problem

Gears and belt are ok belt is tight , not twisted

Dont know what to change or if I should buy a brand new servo.

But the problem started with the old servo and it did have the step down

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03-19-2009 05:21 AM  8 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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You did neither your servo OR your gyro any good. The 9254 is rated for no more than 5.8 volts, the 401 is rated for 6.0. If they were cats, you used up several of those famous 9 lives.

You may have gotten lucky that the magic smoke is still inside both.

I wouldn't recommend doing it again.

Your heli problem sounds more like a setup or mechanical issue, however.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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03-19-2009 05:33 AM  8 years agoPost 8
MANCHA

rrVeteran

Cabo San Lucas,​Baja- Mexico

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your servo is dead but,

it and/or you do not know it yet !

save your heli and buy again.

MANCHA

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03-19-2009 11:49 AM  8 years agoPost 9
BarracudaHockey

rrMaster

Jacksonville FL

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That 6v rating is for a 5 cell pack on the 401 but I'd be worried about the servo.

Andy
AMA 77227
http://www.jaxrc.com

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