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HomeAircraftHelicopterHIROBOOther › strange problem!
10-11-2005 06:58 PM  12 years agoPost 1
bparro

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indianapolis,in

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The other day I went to fly my evo 50 and went up to do a single stationary roll. The problem was that when I wanted to stop the roll and returned the stick to neutral the heli kept rolling! It compteted another full roll before full opposite stick stopped it. My first thought was that the servo (9202) is sticking. So I put it on the ground with the engine still running at idle and checked the servo over and over but could not get it to do it on the ground. I have already ordered 2 9252 servos but I want to make sure the problem is in the servo. Is it possible that the head itself is sticking somehow? And has this ever happened to anyone else? I tried just today to get the servo to stick again but it wouldnt. Any ideas?

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10-11-2005 07:03 PM  12 years agoPost 2
RCHeliJim

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Orem, UT USA

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Did you cut the notch in the canopy by the swashplate control ball on the "passenger" side? It may be binding on the canopy in flight.



Go Fly, Have Fun!!
-Team Quick UK

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10-11-2005 07:08 PM  12 years agoPost 3
bparro

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indianapolis,in

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yes, cut the canopy when it was first built.

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10-11-2005 07:27 PM  12 years agoPost 4
Defiant

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usa

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Is the phasing at your swash plate correct??....make sure there's no binding there, and that your radius block has'nt turned causing it to be out of phase.

*

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10-11-2005 07:35 PM  12 years agoPost 5
jaxrotor

rrKey Veteran

Jacksonville FL

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pcm lockout maybe? radio interference and pcm kept the servos where they were at until it got the signal again?

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10-11-2005 09:51 PM  12 years agoPost 6
bparro

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indianapolis,in

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the phasing block is solid and in the correct position. It is the aluminum one so it is'nt cracked either. Iam using FM so there was no pcm lockout. Iam pretty sure that it is not a glitch. I have noticed it before but this is the worst. My setup: airtronics 94758Z servo for collective, 9202's for cyclic, hitec 525 with TJ Pro for throttle, duralite 4000mah with 5.1 volt regulator. Airtronics rd8000 radio. I cant find anything really wrong here so Iam leaning towards the servo going bad.

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10-11-2005 10:06 PM  12 years agoPost 7
goof2

rrApprentice

Bristol,CT

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check your regulator!

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10-11-2005 10:17 PM  12 years agoPost 8
Defiant

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usa

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Try applying a load to the servo in question..........see if it acts up under pressure. I saw a similar issue but with a 8700g.. used as a throttle servo...it did'nt lock-up until it was uder a load, sitting on the bench..it was fine.

*

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10-11-2005 10:28 PM  12 years agoPost 9
bparro

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indianapolis,in

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I checked the servo under pressure and it still would not lock up. It does seem to move slightly slower than the other 9202 on the elevator. How would I go about checking the regulator?

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10-11-2005 11:08 PM  12 years agoPost 10
rdalcanto

rrKey Veteran

Salt Lake City, UT

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Man, be careful of that servo. Moving slower than the other one is a bad sign. I had a 9252 fail on me and crashed my Fury Extreme. The thing that pissed me off most is that it gave me warning and I didn't pay attention. The servo would hesitate slightly and I made excuses - it was the wind, etc. Two flights later I did a back flip and it wouldn't stop flipping....

Rick

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10-12-2005 03:08 AM  12 years agoPost 11
bparro

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indianapolis,in

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servo
yup, I already have 2 new 9252 servos to replace the 9202's with. I will not be flying it again until I swap the servos. Too bad, I really love my evo 50! Well I have an evo 90 I need to get used to anyway. I will report back after I swap the servos.

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10-12-2005 04:49 AM  12 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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There's a chance one of the windings in the motor is broken. That will produce a dead spot in the servo rotation -- when the dead section of commutator ends up stopped on the brushes.

You find it by VERY SLOWLY moving the servo from end-to-end. If you've got a broken winding, you should be able to get the servo to stop at that point, and then move the sticks like crazy, until you give the servo a little push to get the dead section off the brushes.

Many years ago I had a Schluter Champion that simply rolled over on its side from a hover and died. Bad servo motor.

Later, I had an Xcell heli that did about two more loops than I had planned. I got the heli down, and as I was walking up to it while moving the sticks, saw that I had aileron, but no elevator. Bumped the swashplate, and the servo started working again. The little bit of movement on the swash due to aerodynamic loads as the heli was flying was enough to move the servo past this dead spot in the air.

Dave

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10-18-2005 07:07 PM  12 years agoPost 13
bparro

rrVeteran

indianapolis,in

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solved!
Okay, Just for everyone who contributed to solving my problem I would like to thank you. I replaced the two 9202 servos I had on the elevator and aileron and the problem is now gone. Boy am I glad I did not total the heli! It still cost me $120 though! I replaced them with 9252's.

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