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fastone93 · 03-16-2010, 06:23 PM

I have a 401 w/9254 on a raptor 50. I have been flying this setup as is for a few months now with no issues. Today I went flying and the tail twitched a few times, twice during normal flying and twice in a hover. It seems to always go to the right, and then it comes back to where it was originally (pretty much). Is this a gyro issue, or rudder servo issue. I have no idea how old either of these are, they came on the heli used.

Thanks,
Brian

Creaky Cactus · 03-16-2010, 06:54 PM

My twitching problem with my 401 was due to insufficient vibration isolation. I added more foam tape and the problem went away. Your mileage may vary.

fastone93 · 03-17-2010, 07:05 AM

thanks cactus, I'm going to try to resolve the issue this evening!

ShankBones · 03-17-2010, 11:16 AM

Could it possibly be a sticky oneway bearing, engine fuel mixture or a questionable glow plug?

Just a thought

fastone93 · 03-18-2010, 01:58 PM

I think I found my problem. I took the case apart on the 9254 and there was a small amount of fuel residue on the circuit board. I sprayed it full of contact cleaner and let it dry and have had no further problems (for 6 tanks at least).

Brian

Bob O · 03-18-2010, 02:13 PM

Wow, clever of you to look there Brian. Glad it solved your problem!

dhc8guru · 03-18-2010, 02:52 PM

Mine has developed this same problem. I already had the servo out for a cleaning and inspection so I am going to try the other suggestions. I added a piece of velco strap around the gyro and think it maybe the problem or need to add some more foam tape under it.

Finless · 03-18-2010, 03:00 PM

The 9256 servo has rubber O-rings to help seal the servo from fuel. Older helis mostly had boom mounted tail servos in the day, and they would always get messy with fuel. Many guys would seal up the 9254 with shoe goo or silicone sealant to keep the fuel from getting at the circuit board.

Bob

dhc8guru · 03-18-2010, 03:07 PM

I sprayed some Corrosion X on my 9254 circuit board while I was in their. Ever since it fixed my Align 2-1 switch, I seem to be spraying it on everything.

My servo is located way away from any Nitro oil, so I doubt it is an issue.

03-16-2010, 06:23 PM	#1 (permalink)
fastone93 Registered Users My HF Map location Join Date: Nov 2009	Gyro Question I have a 401 w/9254 on a raptor 50. I have been flying this setup as is for a few months now with no issues. Today I went flying and the tail twitched a few times, twice during normal flying and twice in a hover. It seems to always go to the right, and then it comes back to where it was originally (pretty much). Is this a gyro issue, or rudder servo issue. I have no idea how old either of these are, they came on the heli used. Thanks, Brian __________________ Trex 700L Dominator X 2, Trex 450L Dominator X 2

03-16-2010, 06:54 PM	#2 (permalink)
Creaky Cactus HF Support Join Date: Dec 2008	My twitching problem with my 401 was due to insufficient vibration isolation. I added more foam tape and the problem went away. Your mileage may vary. __________________ The Cactus - Just pick up the sticks, and FLY! Blade (mCX, CX2, mSR, mCP X, mCPX BL; 180 CFX, 400) * T-Rex (450SE2, 600E) Blade (Nano QX, 200 QX) * DX7 * Phoenix v5.5k Helis and MRs wrecked while-U-wait since 2008-05-27

03-17-2010, 07:05 AM	#3 (permalink)
fastone93 Registered Users Thread Starter My HF Map location Join Date: Nov 2009	thanks cactus, I'm going to try to resolve the issue this evening! __________________ Trex 700L Dominator X 2, Trex 450L Dominator X 2

03-17-2010, 11:16 AM	#4 (permalink)
ShankBones Registered Users Join Date: Sep 2007	Could it possibly be a sticky oneway bearing, engine fuel mixture or a questionable glow plug? Just a thought __________________ *"Whats Right is Right and Whats Wrong is Not Flying"* 600EFL,Vbar,BLS251&451,12s,Sahara reg 7.4 ion,Maverikk blades. x2 Align 700e & 700n, Futaba, Align servos, Vbar, Helicom x 3 Align 600n, 600ePro, esp. Radix,Mavrikk,Align Blades.

03-18-2010, 01:58 PM	#5 (permalink)
fastone93 Registered Users Thread Starter My HF Map location Join Date: Nov 2009	I think I found my problem. I took the case apart on the 9254 and there was a small amount of fuel residue on the circuit board. I sprayed it full of contact cleaner and let it dry and have had no further problems (for 6 tanks at least). Brian __________________ Trex 700L Dominator X 2, Trex 450L Dominator X 2

03-18-2010, 02:13 PM	#6 (permalink)
Bob O Member My HF Map location Join Date: Dec 2008	Wow, clever of you to look there Brian. Glad it solved your problem! __________________ ):>

03-18-2010, 02:52 PM	#7 (permalink)
dhc8guru Registered Users Join Date: May 2008	Mine has developed this same problem. I already had the servo out for a cleaning and inspection so I am going to try the other suggestions. I added a piece of velco strap around the gyro and think it maybe the problem or need to add some more foam tape under it.

03-18-2010, 03:00 PM	#8 (permalink)
Finless Team Taco VP My HF Map location Join Date: Nov 2005	The 9256 servo has rubber O-rings to help seal the servo from fuel. Older helis mostly had boom mounted tail servos in the day, and they would always get messy with fuel. Many guys would seal up the 9254 with shoe goo or silicone sealant to keep the fuel from getting at the circuit board. Bob __________________ "Don't Taco My Pack Dude!" NEW Video Link -> Safety Video #1 Video Link -> CAUTION using powerful tools! Video Link -> How to CRASH TWICE in one flight! Video Link -> Don't Taco!

03-18-2010, 03:07 PM	#9 (permalink)
dhc8guru Registered Users Join Date: May 2008	I sprayed some Corrosion X on my 9254 circuit board while I was in their. Ever since it fixed my Align 2-1 switch, I seem to be spraying it on everything. My servo is located way away from any Nitro oil, so I doubt it is an issue.

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