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HelicopterKyosho Caliber/Quest Neo-Caliber series › Cal 30 main gear tooth strips occasionally
12-03-2007 01:31 AM  9 years agoPost 1
hansuha

rrNovice

Republic of Korea

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My Caliber 30 suffers from stripping a tooth of the main gear after 15-20 flights. I usally fly FFF, stall turn, loop and roll, not aggresive 3D flight. The bird is equipped with OS37 and Hatori #415, and uses 30% nitro fuel.

How can I fix this sympthom? Any advice would be appreciated.

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12-03-2007 02:29 AM  9 years agoPost 2
cyclic fever

rrApprentice

Seymour Indiana

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Are your bearings in good shape? I've been pretty rough with my C30 from crashes and running a 37 and havent had a gear strip, yet. I'm only guessing but, if you've got some bearing issues and they're trying to lock up, I wonder if that might be causing a high load on the drive train. Other than that, I cant offer any other ideas.

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12-03-2007 02:34 AM  9 years agoPost 3
hansuha

rrNovice

Republic of Korea

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All bearings are good and no lockup. and one-way bearing is good too.
I have injected bearing oil occasionally and insfect them. and have no found any flaws.

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12-03-2007 06:13 AM  9 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

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I had one of my three Caliber 30's do this several times in the course of a year. I finally replaced the one-way clutch, and it appears to have solved the problem. The one-way clutch can be asked to absorb some nasty loads that you can't reproduce simply by hand.

-----
Dave

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

Team Heliproz

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12-03-2007 08:54 AM  9 years agoPost 5
hansuha

rrNovice

Republic of Korea

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One-way clutch means one-way bearing, Dave ?
If it means one-way bearing, is it helpful to upgrade to HG one-way bearing?

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12-03-2007 04:48 PM  9 years agoPost 6
Optech

rrKey Veteran

San Diego, CA.

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is it helpful to upgrade to HG one-way bearing?
I was wondering this myself. Is there any difference between the CA5111 one-way and the CA3510 HG one-way???

Correct me if I'm wrong but I thought the 3510 HG part was an upgrade to the original CAL30 one-way. But when the CAL5 came out, it was included as a standard part...CA5111.

Later,
Mike

Viva La Airtronics!

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12-03-2007 11:47 PM  9 years agoPost 7
heli-cuzz

rrElite Veteran

Pittston, Pa. USA

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I've flown over 130 gallons of fuel on my Caliber30 and have not had any probs with the main gear stripping. The one-way has always been good with no slipping or lock-up. My Caliber5s have had the one-way locking up usually after ten to 15 gallons of fuel.

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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12-04-2007 02:45 AM  9 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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One-way clutch = one way bearing.

It's actually a clutch, not a bearing. Bearing is a misnomer.

-----
Dave

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

Team Heliproz

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12-04-2007 02:47 AM  9 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Of the three Caliber 30's I had (I still own two), one of them stripped out the main gear several times over the course of a summer until I replaced the one-way clutch. The other two, even after nearly six or seven years, never hurt a main gear, and when the one-way died in one of the remaining two, I replaced it, and continue to fly, trouble free.

-----
Dave

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

Team Heliproz

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12-04-2007 04:37 AM  9 years agoPost 10
hansuha

rrNovice

Republic of Korea

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Thanks for all of the advices and hints.

I reviewed my Cal30 flight and maintenance logs and past threads in RR about this. and found the reason of the problem. The reason is vertical free play that exists in main mast (about 3~4mm).
I got symthoms that occasionally looses mast stopper and that causes the vertical free play, so main gear has half engaged vertically in pinon gear.

Fixed this problem with applying two mast stopper and red locktite.
After test flying (about 20 flights), I could post the result.

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12-04-2007 10:56 AM  9 years agoPost 11
heli_headcase

rrKey Veteran

Hovering around Atlanta

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Better definition...

One-way clutch = one way bearing.

It's actually a clutch, not a bearing. Bearing is a misnomer.
I've been trying to drill this naming error into all manners of heli fliers, owners, magazine writers and all just want to "go with the flow" and call it a bearing. Frustrates me no end.

The clutch is more accurately termed an "Overrunning Clutch", due to the fact that it lets the drive power disconnect when one part is spinning faster (Ex: inner spins faster than the outer) or grabs when the reverse is true. Calling these clutches "Torrington Bearings" is no good either as the Torrington company manufactures all types of bearings consisting of needle rollers intended exclusively for reducing the friction of rolling elements. Torrington refers to their needle roller clutches as overrunning clutches.

I can't imagine the teeth stripping off the CA30 main gear unless something obvious is wrong. It there was really 3-4mm vertical movement in the mainshaft you would have some difficulty controlling collective pitch under light G loading. The heli would jump up-and-down slightly even when no collective input is given...again, under light G loading, stall turns for example. Were half the length of the stripped teeth missing and half still OK? Let's hope you've found the problem.


HHC

So many heli's - too little time...

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12-04-2007 01:18 PM  9 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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Usually one or two entire teeth disappear in flight.

The mast stopper sliding on the shaft is not uncommon, once you get it tight, it will stay put. If it does slide a bit, it doesn't affect the "freeness" (new word) of the drive train, it does affect your flying as the collective and cyclic goes really weird from the shaft moving up and down.

Replace the one-way clutch. Go fly.

-----
Dave

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

Team Heliproz

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12-05-2007 04:00 AM  9 years agoPost 13
hansuha

rrNovice

Republic of Korea

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Yes, I had strange collective control when there exists vertical free play in main mast. Escpecially the end of the stall turn or loop.
Actually, I replaced one-way clutch about 2 weeks ago with new one, and the symptoms occured repeatedly.
This weekend I will test just with mast stopper fixing, and if the problem occurs again, then will replace one-way clutch.

Thanks again

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12-23-2007 08:39 AM  9 years agoPost 14
hansuha

rrNovice

Republic of Korea

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Problem Resolved.

I think the exact reason for the stripping main gear tooth is the free play in the drive pulley at one-way clutch bearing.
I had two main sympthoms that stripping main gear tooth and occasional slipping one-way clutch bearing.
After glued the one-way bearing in the drive pulley with epoxy, all of the problems were disappeared.

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12-23-2007 04:25 PM  9 years agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

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You probably should have just replaced the one-way clutch. It's NOT a bearing, it's a clutch.

The pulley is designed to allow the one-way clutch to float inside it as a self-aligning feature. It allows the clutch to align itself on the shaft so that all the rollers can engage the shaft equally. The two bearings on the top and bottom of the gear are what hold the shaft in place in the pulley.

The occasional slipping that you experienced was the clutch telling you it is going bad and that was the reason you were stripping the teeth.

-----
Dave

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

Team Heliproz

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12-24-2007 01:30 AM  9 years agoPost 16
hansuha

rrNovice

Republic of Korea

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Thanks for the detailed information, Dave.

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12-25-2007 12:44 PM  9 years agoPost 17
roys55

rrApprentice

USA

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Don't forget to take a good look at the shaft where the one-way needles ride, might be galled.

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HelicopterKyosho Caliber/Quest Neo-Caliber series › Cal 30 main gear tooth strips occasionally
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