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HelicopterMiniature Aircraft Whiplash & Fury 55 › Xcell clutch engagement
05-01-2004 04:01 AM  13 years agoPost 1
Toadster25

rrKey Veteran

Iowa

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Why do xcell clutches seem to engage at such a low rpm. I never really had a problem with it but after helping someone with a JR Voyager or venture (not sure what it was but has an os 32 in it) I noticed the clutch didn't engage at the same rpm as my xcell fury or my old xcell 30. It just seemed nice to not have the main blades tring to turn all the time.

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05-01-2004 06:00 AM  13 years agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

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A later engagement time has long been a characteristic of Japanese clutches, but I VERY much prefer a clutch that engages that moment the engine speed rises above a slow idle. I'll even tolerate a wee bit of drag. Why? Longevity of components. The sooner that clutch fully engages, the lower the liner wear with each run-up cycle. The sooner the clutch engages, the smaller the distance the shoes have had to move, which helps to minimize long term metal fatigue.

There is no reason that the engagement time be so early that the head is hard to hold or brake for adjustments, but if your clutches are simply engaging just above a slow idle, you'll be happy in the long run with how long the system lasts.

Ben Minor

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05-01-2004 07:29 AM  13 years agoPost 3
Arthur Brulé

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Reims, FRANCE

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Hi Dr. Ben,

you note : There is no reason that the engagement time be so early that the head is hard to hold or brake for adjustments

my fury clutch engage during adjustements but i was still with the break-of the YS91. Is it due to the idle high during break-in or is there a problem on the mechanic ?

thanks

Arthur
France

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05-01-2004 08:07 AM  13 years agoPost 4
SkyfoxSXer

rrApprentice

Gainseville,VA

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Your clutch is most likely engaging because your idle is to high during the breakin period. The recommeded breakin settings on the low needle for the YS91 is really rich which makes it hard to get a reliable idle without moving up the throttle stick. Once you start leaning it the idle will become alot smoother and your clutch should not engage as early. My YS91 can now idle for a 5 minutes without spinning the blades. It couldn't do this until breakin was completed and my needles were set to the running settings.

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05-01-2004 07:06 PM  13 years agoPost 5
Dr.Ben

rrMaster

Richmond, VA, USA

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In addition, MA gaps the clutch/liner pretty closely on the big models to avoid the chance for slippage under high flight loads. It takes a little while for the liner to fully bed in. You'll notice it especially with a new engine, which won't idle to a tick over for a while. Unless there are some unmentioned issues like a hot start or something, I doubt there are any problems with your mechanics. I personally like to feel a touch of drag when the system is new. I know it'll become perfect over the next several gallons of fuel.

Ben Minor

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05-01-2004 07:20 PM  13 years agoPost 6
DS 8717

rrProfessor

Here wishing i was somewhere else

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I always chuck mine up in lathe and true the linner up a little. All the ones i have done have been out of round,truing it up usually only takes a couple of thousands out and lets the clutch engage smoothly with out any drag at idle. DOUG

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05-02-2004 12:52 AM  13 years agoPost 7
Conrod

rrVeteran

Mount Dora , Florida

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ditto Doug

.010" clearance is perfect.
Went .009 and had some drag for the first couple galls.

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HelicopterMiniature Aircraft Whiplash & Fury 55 › Xcell clutch engagement
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