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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › hawk pro tail twitch
10-15-2005 08:05 PM  13 years agoPost 1
gymmshoes

rrNovice

Phoenix Arizona

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Seems I have a problem I cant seem to pinpoint.

I have a hawk pro OS50, 401/9254 combo, with constant tail drive and triple bb tail hub. I installed the speed up gear.

The heli is stable and flys great, but an annoying tail twitch seems to point to a problem i cant find. Ive leaned\richened the engine, tried gyro sensitivity adjustments from 30 all the way to 100%. gyro does its job as I can punch it and stays steady.

Its in AVCS mode and tail response is great to inputs. My gyro is mounted up on the servo tray with nothing touching.

its not too bad of a twitch, only about 2-3 inches but does it most of the time.
It does have the stainless dual coupled torq drive, but did it with the old torq tube as well.

Help me solve this annoyance!....Fun fly is in a couple a weeks...
Thanks,

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10-15-2005 10:35 PM  13 years agoPost 2
bellecrank

rrVeteran

Canada

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Open yuor tail gearbox and check to insure that both pins that secure the tail rotor gears are centered and properly locked down by the allen screws that are inserted into each end of the input and output shafts.

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10-16-2005 04:13 AM  13 years agoPost 3
gymmshoes

rrNovice

Phoenix Arizona

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thanks bellecrank, I found the allen missing entirely from the input shaft,
pin was flush with gear sides but actually fell out while l was looking for a replacement allen. you prob saved me a future crash. for the twitchy wag i went ahead and put in another gy401 to test tomorrow.

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10-17-2005 01:27 AM  13 years agoPost 4
gymmshoes

rrNovice

Phoenix Arizona

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turned out to be the clutch of all things. changed the bell with factory replacement with liner installed, same clutch shoe, no more twitch...

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10-17-2005 02:50 AM  13 years agoPost 5
BC Don

rrElite Veteran

Calgary, AB Canada

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Gymshoes, glad you found the problem. I HATE glitches like that which you can't find for love nor money (well a whole new kit usually resolves it but that's more money than I want to pay).

My prior glitch seems to have been due to a bad 401. Not 100% sure yet but I'll get it figured out.

Got Money? Send it to me, I'm a Heli Addict.

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