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Dang! Two guys we haven’t heard from in a
long time coming out of the woodwork at the same time!
Lynn and Ed! What has been going on with you
guys lately?
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Tuesday, July 28, 2015 12:58
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re:
Alternative redrives
The Ross unit had no thrust bearings and
used the engines thrust bearings for that function. OK on most engines where
plain bearings control thrust but in the rotary small needles do that and
cannot survive long.
Tracy's units have a thrust set installed.
Ross units built after the principal died
had suspect quality.............
In a message dated 7/28/2015 12:23:28
P.M. Eastern Daylight Time, flyrotary@lancaironline.net writes:
I flew around 200 hrs with the Ross Drive before
finding that the sun gear was galling. Apparently marginal lubrication in
some of the Ross units was a problem.
By that time, Tracy
had his Re-drive on the market, so rather than mess with the Ross (still have
it), I purchased one of Tracy’s
and never had a problem. Well, one – I had the entire aluminum area
nickel plated for corriosion and appearance. They erroneously coated the
inside of tunnel for the shaft area of the nose part reducing the area
for oil flow. Went out one morning and noticed that it was hard to pull
through, I tried to start the engine and it rotated a few degrees and just
stopped. Fortunately, I desisted at that point and stopped. Got out
and found the prop frozen. Took it off and shipped to Tracy, he milled a few 1/10000 off the inside
of the shaft tunnel and I now have around 400 hours on it. Love it!
Sent: Tuesday, July 28, 2015
11:56 AM
Subject:
[FlyRotary] Re: Alternative redrives
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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