|
|
|
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.............
Lynn E. Hanover
In a message dated 7/28/2015 12:23:28 P.M. Eastern Daylight Time,
flyrotary@lancaironline.net writes:
Hi Bill,
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!
Ed
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
|
From: |
Bill Bradburry
<flyrotary@lancaironline.net> |
|
Subject: |
RE: [FlyRotary] Re: Alternative
redrives |
|
Date: |
Tue, 28 Jul 2015 10:22:59
-0500 |
|
To: |
'Rotary
motors in aircraft'
<flyrotary@lancaironline.net> |
|
|
|
|
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
|
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.
This message, and the documents attached hereto, is
intended only for the addressee and may contain privileged or confidential
information. Any unauthorized disclosure is strictly prohibited. If you have
received this message in error, please notify us immediately so that we may
correct our internal records. Please then delete the original message. Thank
you.
No virus found in this
message.
Checked by AVG - www.avg.com
Version: 2015.0.6081 / Virus
Database: 4392/10324 - Release Date:
07/28/15 |
|