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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Predator Gasser Fan...How tight???
11-07-2004 07:41 PM  13 years agoPost 1
Skypig

rrNovice

Citrus Heights, CA

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OK...I need a little help here. Have read all the buildup info on the gasser,and I got the fan onto the engine and the runout to about .0005. I found that as I tighten the fan the runout would increase, so I tap it and bring it back to about .0005 with no problem. But how tight does it need to be. I put a plastic hanger in the exhaust and tighten the bolt down very tight (fearing if I go tighter I will break something). I check the runout and if it is off I can still tap it back to .0005. Then if I try to tighten the bolt, it it VERY tight. I'm afraid that if I go any tighter I will break the piston rod or something. I'm guessing that it is OK since the fan does not get whacked by anything once it is all set up, I just found it unusual that no matter how tight I got it I could always tap it back to a very low runout. BTW, I am whacking it pretty good with a hardwood 1X2 to make these adjustments.
Anybody got any responses to this?
Thanx

PS: This looks like it is going to be one awesome heli. Can't wait to fly it.

Taking off and flying are easy, It's the landings that will kill you.

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11-07-2004 11:29 PM  13 years agoPost 2
SteveH

rrProfessor

Texas

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Skypig,

I understand your situation, because I've had a fan come loose after tightening as per the Century specs of 1/4 turn. All I can tell you is the one that I put on before reading the spec , did not come loose, but it was a real bear to take apart. So based on that experience, I'd tell you to make it tight, but not too tight. Remember with the collet system, the tightening you do on the nut is sort of exponentially applied to the collets, meaning they tighten at a faster rate than the nut.

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

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11-08-2004 03:52 AM  13 years agoPost 3
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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Gasser, Steve, Gasser!!

Chris D. Bergen

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11-08-2004 10:03 AM  13 years agoPost 4
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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OK
I use an old toothbrush thru the exhaust port, note that I also use a hex bolt, not an allen head that they supply in the kit. It is also important (for fan removal) to replace the bolts that hold the lower fan shoud onto the engine under the fan. I use a 6 inch ratchet with a socket on it, and hold the fan with a rag while tightening. I get it darn snug, while holding it with both the toothbrush and by hand (this done in the vise). Be SURE to use a grease on the crankshaft.....when it is snug, a whack with your stick isn't going to move it.
Be sure to check the clutch runout as well. Of course, that is only on the solid sections (2) of the clutch.

James

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11-08-2004 12:52 PM  13 years agoPost 5
SteveH

rrProfessor

Texas

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Thanks Chris,

Must have had my mind somewhere else.

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

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