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HomeAircraftHelicopterAntiques or Out of Business › T/R wire-drive
04-28-2010 02:09 PM  8 years agoPost 1
ch-47c

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san jose, ca

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Has anyone used a Heading-Hold gyro with a wire-drive tail rotor without breaking the wire. My early HH gyros like the CSM 360 didn't seem to give the wire-drive much stress, but I'm considering using something more recent on my Cricket.

Thanks

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04-28-2010 02:15 PM  8 years agoPost 2
rstacy

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Rochester, NY

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I tried this many years ago on my X-cell 60 with the CSM 360.
The wire wind up/whipping was terrible. I didn't run it long enough to find out how long the wire would last.
I suppose it would be better if you ran it in the rate mode.

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04-28-2010 02:25 PM  8 years agoPost 3
Frank Bostwick

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Cincinnati Ohio

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I flew my Hawk Sport for a couple of years with a wire drive and a trusty ole 401. Got some wind up but never broke one...

RIP ROMAN

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04-28-2010 03:08 PM  8 years agoPost 4
Clearance

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Rain Forest of Western Canada

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I used to use a Futaba 401 with the wire-driven tail of the Kalt Enforcer ZR. The 27.25 inch wire never broke over hundreds of flights. It does windup and release so it wasn't the best setup; now I use a torque tube drive.

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04-28-2010 03:42 PM  8 years agoPost 5
ch-47c

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san jose, ca

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Okay. I have to use the wire-drive on the Cricket, no torque tube. I have a JR 120 that is pre-Heading Hold period correct and a Futaba 401 that I can use in Rate mode.

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04-28-2010 05:54 PM  8 years agoPost 6
R.J.

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SF bay area, CA USA

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I don't know what others' experience was, but I broke the drive wire on my Cricket at the pulley end just from use because of the curve in the drive wire. And that was with the Kraft/GMP style gyro back in the day. I ended up going to the straight tailboom of the H300. Don't know if a good chamfer on the pulley end of the driveshaft hole might help reduce fatigue of the wire. Otherwise, maybe change the wire every so often for insurance regardless of what gyro you use.

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04-28-2010 07:00 PM  8 years agoPost 7
ch-47c

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san jose, ca

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Did it break right at the end of the pulley where the wire enters or between the pulley and the brass tube?

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04-28-2010 07:24 PM  8 years agoPost 8
R.J.

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SF bay area, CA USA

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It usually broke right at the point it exited the pulley, never in the middle or at the guide. I did fly it a lot and did not replace it on a routine basis, only when it broke. I was a student back then on a budget.

With regards to the whipping/ wind-up, the Cricket blades are pretty small and light. I'm not sure you would have a problem with it in normal flight. But to be safer, you could use the gyro in rate mode, which would be more period correct anyway.

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04-28-2010 07:34 PM  8 years agoPost 9
Four Stroker

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Atlanta

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Use the 401 in HH mode and TURN DOWN THE GAIN.

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04-28-2010 10:59 PM  8 years agoPost 10
ch-47c

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san jose, ca

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Wow, all sounds good. I have the JR 120 which is an old brass flywheel type of gyroscope. it is heavy which would keep the CG in limits. The 401 is much lighter.

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04-28-2010 11:12 PM  8 years agoPost 11
payne1967

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uk

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i'm running the 401 in hh in graupner,hirobo,morley and vario mechanics without a problem to the wire drive
i'm not stick banging with them as they are all scale machines
i hope this helps you

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04-28-2010 11:52 PM  8 years agoPost 12
ch-47c

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san jose, ca

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Sure it helps. I'm flying the Cricket strictly for sentimental reasons. It's for hovering, and loops and rolls.

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04-29-2010 12:16 AM  8 years agoPost 13
rcpilotmike

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GroveCity, Ohio, USA

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I fly a 401 on 2 cobras and my Concept srx. All wire drive with no problems. I do not use a high speed tail servo which I think helps save the wire and the beveled gear. Plus I only sport fly those machines.

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