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I stand corrected. This drive would only
have a couple of teeth in contact at any one time. How many are in contact
with the RD1-C?
What was the problem with the Ross if you
know?
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Tuesday, July 28, 2015 10:37
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re:
Alternative redrives
No, Tracy started off with a Ross Drive …
The Marcotte drive
is a different configuration than Tracy’s
“Ford-6” planetary gear set: read for yourself … http://www.sdsefi.com/air14.html
Jeff
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From:
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Bill Bradburry
<flyrotary@lancaironline.net>
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Subject:
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RE: [FlyRotary] Re: Alternative redrives
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Date:
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Tue, 28 Jul 2015 10:22:59 -0500
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To:
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'Rotary motors in
aircraft' <flyrotary@lancaironline.net>
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Jeff,
If I am not mistaken, Tracy
started off using a Marcotte drive on his RV-4. That drive I think is
what inspired him to develop his own drive. It would take a pretty bad
experience to inspire me to that extent! :>)
Bill
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From: Jeff Whaley
Sent: Tuesday, July 28, 2015 10:17
AM
To: 'Mark Steitle'
Subject: RE: [FlyRotary] Re:
Alternative redrives
I see the aircraft
was equipped with an Aluminum Propellor – which may have lead to the prop shaft
fracturing?
I can’t vouch for
the “Marcotte Drive”
but Ross Parnham (referenced on this list for P51 style radiator install) uses
the Marcotte Drive
on his Subaru-powered RV6, mated to a composite prop. The website shows a
picture of re-drive and bell housing mated to a 13B … http://glasairproject.com/Marcotte/index.html
Jeff
Search YouTube under "LS1 Glasair 111 at Paducah, Ky"
for a video of this a/c idling. You can hear him saying the PSRU builder
is "belly up".
Sent from my iPad
That was during the
Canard Fly-in at Rough River 2011
Sent: Monday, July 27, 2015
2:02 PM
Subject:
[FlyRotary] Re: Alternative redrives
That looks a lot like
the gearbox that failed, killing the pilot when the engine disengaged from the
prop and he dead-sticked it into a hotel building. It was about a week
after the alternative engine fly-in at Ed's place in Paduka, KY.
As I recall, it was a Glasair III with a turbo-charged LS1. I have video
of a ground run around here somewhere. Real sad story. Can anyone
confirm whether or not it was the same make psru? I never read the final
accident report.
On Mon, Jul 27, 2015
at 11:31 AM, Bill Schertz <flyrotary@lancaironline.net>
wrote:
I went back to the
exhibit buildings, and took some photos of the psru’s offered by www.autopsrus.com . I will
forward these later today as every thing gets transferred . They are spur gear
drive, have there own oil supply and pump, use pressure fed roller bearings, will
provide oil for a constant speed prop, and are available in many reduction
ratios. They make a unit that can be straight through, suitable for the 13-B,
the casing is CNC machined. They use a flywheel for the torque damping, and it
has a centrifugal clutch that disengages the prop below ~900 engine rpm, so
when starting there is no prop load. Will likely be heavier than Tracy’s
I have to reduce the
size of the pictures before I can send them.
Sent: Sunday, July 26, 2015
1:59 PM
Subject:
[FlyRotary] Re: Anyone or everyone in Oshkosh?
That is very interesting! Could one be built specifically for my combination of
a high HP 20 B? I would have more peace of mind knowing how it was put together
by me along with your knowledge and experience. The thought of someone just
starting out making them does not sit well with me as they are an unknown.
Let me know what you think and I will be in touch.
The
design is royalty free. Anyone who wants to build it is more than
welcome. I can help with info if you need it.
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