REFLECTOR: From IVO

[Alex Balic]

Actually the springs are a factor in the clutch when it is engaged- they are
what presses the pressure plate  (containing the leaf springs) against
clutch disk (friction surface)  and onto the flywheel. you either loose
clutch when the disk wears out or if one or more of the leaf springs break.
Same for a motorcycle, except there are usually 5 or more disks in there to
smooth out the release and the disks don't have built in spring dampers.
The other springs that we might be talking about here are the small coil
spring dampers located on the clutch disk that actually transmit the power
through the disk to the spline section. your clutch will usually lock up if
one of these breaks or falls out.  On my redrive (Marcotte type from
Crossflow) there is no clutch, but the flywheel is attached to the input
shaft with  the spring damper arrangement- I have seen some urethane dampers
used also, but they probably can't take any appreciable heat. I wouldn't
think that any damping would be needed with the electric motor-like
smoothness of the flat Subaru 6, but they won't hurt anything- I would bet
that Crossflow would sell the flywheel as a separate piece, but would only
work with a corresponding bell housing, spline section, and starter.....

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
Behalf Of Wayne
Sent: Saturday, July 17, 2004 7:24 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: From IVO


After the clutch is fully engaged in a car (foot off the clutch) the springs
are no longer a factor.
Thus I'm trying a solid coupling and a heavier flywheel (Marcottes light one
doesn't help).  I understand Eggenfeller uses this arrangement on his Soob
engines.
Wayne
----- Original Message -----
From: "Brian Michalk" <michalk at awpi.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Monday, June 28, 2004 3:03 PM
Subject: RE: REFLECTOR: From IVO


> What about some sort of mechanism like what is found on clutch plates?
> It's very lightweight, and couples several hundreds(for trucks) of
> horsepower through four or so springs from the splined transmission shaft
to
> the clutch pads.
>
> Slip it in between a standard SAE ARP502 prop pad, and the corresponding
> prop.
>
> Don't need the pads.  I'll bet the one from my Dodge weighs less than five
> lbs with the pads.
> At least there would be no heat (not much anyway), because this wouldn't
be
> a damper (like a fluid filled shock absorber).
>
> Only thing is that the automotive design is strictly shear.  A prop design
> would have to handle thrust loads, which would require a thrust bearing if
> one wanted to keep the friction temperatures down.
>
>
> > Brian; that is very interesting.  The viscous damper is the best type of
> > damper for torsional vibration, and eliminating resonance.  To be most
> > effective, it could be "tuned" to a specific engine-prop
> > combination; but in
> > any case, cold make a large difference in pulse stress transmitted to
the
> > prop. Maybe with one of these on a Lyc the IVO would work there also?
> >
> > Al
> >
> >
>
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