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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Carbon Gasser gear mesh
11-02-2004 01:38 AM  13 years agoPost 1
cwhover

rrApprentice

El Paso, TX

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I am almost done with my new carbon gasser, but I have hit a snag. The mesh between the auto hub and the tail gear is WAY too tight, no matter how far in or out I slide the bevel gear. Anyone have any ideas what I might have wrong?

Thanks,

Carl
VISA field rep

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11-02-2004 02:19 AM  13 years agoPost 2
Bushy

rrVeteran

Tucson, AZ

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Sounds like something in the main shaft stack has the main gear setting too high in the frame?

James!! Jump in here.

Dave

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11-02-2004 02:24 AM  13 years agoPost 3
SteveH

rrProfessor

Texas

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You may need to take a few thousands of the brass spacer under the auto clutch.

The government cannot give you anything without first taking it from someone else.

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11-02-2004 02:27 AM  13 years agoPost 4
Heli-Driver

rrElite Veteran

Arlington, TX

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Carl, I just spoke with someone who is building a Carbon G26 and had the same issue. Not real sure why it is an issue.

I have the carbon frames on my 231 and it's tight but OK. I think you have to shave a bit off the large brass spacer under the auto hub to free up the mesh. You can sand it down fairly easy to get some relief.

If you do this make sure it's straight, make the mesh good and tight, it will cut the delrin crown in.

Also make sure your bevel pinion is flush with the edge of the crown for maximum mesh of the gear teeth.

Make sure you don't bottom out the main gear on the frames if you tweak the brass spacer too much.

I wouldn't recommend altering the front transmission alignment holes which is another way to correct the problem.



Raymond

Predator Gasser SE/231 X 2
Century Helicopters

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11-02-2004 03:27 AM  13 years agoPost 5
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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Yep...
reduce the height of the brass shim that is under the autohub by .018 (eighteen thousanths of an inch).

This will get 'er done.


ONLY SAND ONE SIDE.....and that side should face DOWN onto the bearing block.

PM me a number if your still having trouble.

James

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11-02-2004 03:57 AM  13 years agoPost 6
cwhover

rrApprentice

El Paso, TX

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Fixed!

It turns out that the autohub wasn't completely seated against the spacer, and I had a few thousandths up and down play. I loosened the top and bottom retaining rings, gave a good push down on the main shaft, tightened the bottom ring back, and then the top ring. This allowed the bottom ring to reseat properly and eliminated the play in the main shaft. Now the gear mesh is a little tight, but not more than I expected from new gears. Should wear in nicely. Thanks for the ideas, it pointed me in the right direction. Got to say, overall I am impressed with my first Century bird. May have to trade the Rappy 50 for a Raven... Hope to start break in this weekend!

Speaking of break in, I keep seeing references to Bill M's break in, but can't seem to hit the right combination in a search. Can you point me in the right direction or give me a quick rundown.

Thanks,

Carl
VISA field rep

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