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Tracy wrote a string of newsletters which he then published in one of two
books explaining all of this..
One of the main things that he noticed was the fact that under operation
the Ross gears caused the drive shaft to hammer, I believe it was the end of the
eccentric shaft and deform the metal. I'm not that familiar with the Ross, but
the lubrication system is totally different in the RWS.
Since the RWS is a planetary reduction with either 4 or 6 planets (6 in the
1-C), the contact, is probably considerably greater, but that is just a guess.
Additionally the planetary setup does not put side loads on either
the eccentric shaft or the drive shaft bearings.(for whatever that is
worth)
Rich
In a message dated 7/28/2015 10:58:25 A.M. Central Daylight Time,
flyrotary@lancaironline.net writes:
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: |
Bill Bradburry
<flyrotary@lancaironline.net> |
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Subject: |
RE: [FlyRotary] Re: Alternative
redrives |
|
Date: |
Tue, 28 Jul 2015 10:22:59
-0500 |
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To: |
'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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