CorvAircraft> redrives

[AVLEC]

Hi David
My intension with this setup was not for the clutch to act as a tortional
damper but to isolate the crank from the thrust and gyroscopic loads imposed
by the prop as this is what is reported to be the root cause of the cranks
failing. Any damping that is gained from the clutch damper springs is a
bonus. As far as I know there aren't any tortional problems with the
crank???
Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: avlec at telkomsa.net
----- Original Message -----
From: "david stroud" <dstroud at storm.ca>
To: "Corvair engines for homebuilt aircraft" <corvaircraft at mylist.net>
Sent: Friday, April 13, 2007 10:40 PM
Subject: Re: CorvAircraft> redrives


> Giday Dene and Mike. Going way back on the Soob list from the mid to
> late 90's, Dr. Steve Crow of UCLA and Dan Horton of Alabama collaborated
> to try to solve the torsional mysteries with Soob related redrives. These
two
> very clever gents worked hard and long but finally gave up and conceded
that
> they could not solve the problem. Someone, perhaps it was one of them, did
> state at one time that anyone who installs a clutch plate with various
springs
> dampening things has a clear misunderstanding of the problem. ( And I
think
> their intention was to say that it would not in itself lead to a universal
cure )
> BUT...with that in mind, there have been redrives built where the clutch
plate
> thing indeed DID WORK.  So...it may be a decent step in the right
direction.
> Not a cure for all applications, but it may work for some. That's
encouraging
> I think. Clare, you will remember Folis Jones et al promoting their
SubieLyc
> design back around 1999. A redrive unit with urethane donuts, for lack
> of a better description, taking the brunt of what torsional may have
existed.
>
> The Soob guys beat this redrive thing to death and I think some
significant
> info was produced and probably could be searched in the AirSoob archive.
>
> My Rinker did give some of my friends fits when it clicked and clanked
upon
> startup and shutdown. I'd love to see the inside of a Lyc reduction box
because
> it was a certified unit and somehow it worked...albeit with a much lower
TBO.
>
> Methinks direct drive anything is the best way to go if you can. William
has
> positioned himself very well in matching the "standard Corvair" conversion
with
> the 601. It's a heck of a nice marriage. He's proven that the 601 doesn't
need
> a redrive or a turbo in my eyes. His last web update impressed me with an
> indication of some maturing of his product line and ability to produce/
deliver
> what the standard Corvair conversion needs. I think he indicated that he
will
> continue to explore the outer edges of Corvair development too and that's
good
> to see.
>
> David Stroud   Ottawa, Canada
> C-FDWS  Christavia
> Fairchild 51 under construction
> and on the gear...
>
> ----- Original Message -----
> From: "AVLEC" <avlec at telkomsa.net>
> To: "Corvair engines for homebuilt aircraft" <corvaircraft at mylist.net>
> Sent: Friday, April 13, 2007 3:59 PM
> Subject: Re: CorvAircraft> redrives
>
>
> > Michael,
> > I would be very interested in seeing those pics if you get around to
taking
> > them. What you have there sounds exactly what I am planning on doing
except
> > I will be running direct drive. The clutch plate will only be isolating
the
> > crank from the thrust loads as well as damping some of the tortionals
> > (hopefully!).
> > Regards
> > Dene Collett
> > KR2SRT builder
> > South africa
> > Whisper assembler
> > See: www.whisperaircraft.com
> > mailto: avlec at telkomsa.net
> > ----- Original Message -----
> > From: "Michael Sharkey" <mike at rmsharkey.com>
> > To: <corvaircraft at mylist.net>
> > Sent: Friday, April 13, 2007 2:25 PM
> > Subject: Re: CorvAircraft> redrives
> >
> >
> > The gear redrive I have has a splined shaft arrangement. The gear box
has
> > the
> > shaft sticking out, and the alum. flywheel/starter ring has a center
piece
> > fabricated from the center piece of a clutch plate, including the
> > dampeners -
> > this piece allows for a bit of float.
>
>
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