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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityJS › fan and clutch install question
03-31-2009 08:50 PM  9 years agoPost 1
Altrex

rrApprentice

WI

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what kind of run out are you guys getting with your fan hubs? I can get mine less than .005" Also, is it me or is the clutch to fan fit extremely tight?

also, i just saw a post about changing the E Clip to a C clip but have not found any reason why? any thoughts on how important this is?

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04-01-2009 01:08 AM  9 years agoPost 2
Altrex

rrApprentice

WI

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boy oh boy
i must not be an interesting person, nobody hardly ever replies to my posts/topics. or im so intellectual, people are just stunned lol

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04-01-2009 01:14 AM  9 years agoPost 3
James Kovach

rrKey Veteran

canton, oh - US

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To be honest, I am not sure how you can adjust the runout on these machines as the hub screws onto the engine shaft and the clutch is bolted onto that and is not adjustable either.

Pretty much a "get what you get" setup.

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04-01-2009 01:21 AM  9 years agoPost 4
skew

rrVeteran

KY

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you can rotate the clutch 180deg and check to see if you can get any better that is about all the adjustment you have.

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04-01-2009 01:22 AM  9 years agoPost 5
James Kovach

rrKey Veteran

canton, oh - US

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Yet again, another "get what you get" thing. Not much adjusting you can do there.

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04-01-2009 01:26 AM  9 years agoPost 6
gftazz

rrVeteran

upstate N.Y. in the Adirondacks

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I didn't change the E to C clip. I just screwed the fan on and tightened it down. Yes the clutch is a very tight fit into the fan so may be a b*tch to get off there later. I used the 2 large cap head screws that bolts the clutch to the fan to evenly draw the clutch down into the fan as I tightened them down a little at a time.

I didn't check my runout but when I aligned the motor onto the mount and the clutch bell block slides to center it and I ended up loosening the motor on the mount and pushed up on it and it moved like maybe 1mm to get the clutch even with the bottom of the clutchbell. Then while spinning the start shaft and revolving the fan 360% I tightened up everything and it's really smooth with no high grabby tight spots, it spins very freely. That staisfies me as that is what I did with my Raptors and Trex's and they all run smooth with a free spinning start shaft and no fuel tank foaming. I'm guessing my runout must be good then.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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04-07-2009 11:44 PM  9 years agoPost 7
cybsterman

rrNovice

warren,oh

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started to build my frenzy yesterday with a good friend of mine whos also building one at the same time.we both have TT50 redlines and when it came to assembling the clutch on the fan housing his clutch pushed in by hand,mine wouldn so i put a little tri-flow on the fan housing and tapped it in place while having the two cap screws installed to keep it aligned.worked for me

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04-08-2009 08:48 PM  9 years agoPost 8
VooDooX

rrElite Veteran

San Francisco Bay Area CA, US (San Mateo)

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to get the clutch off just grab fan with one hand clutch with other and rotate it off dont try to pull it wont work also use tome wd40 only if you really need to

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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05-16-2009 01:11 AM  9 years agoPost 9
AzHyper

rrKey Veteran

Peoria, Az.

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Just in case you run into the same issue -
Crank runout was .0005"
Fan hub runout was .010" - at this dimension you could even see the wobble at the clutch shoes.
A-Main was very responsive and is mailing out a new fan hub. Lets hope the replacement is not a repeat!
Bottom line - check your fan hub runout as you assemble the unit. I didn't expect a $220 heli to be perfect so check it all out carefully before you trash your engine and/or pinion bearings!

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