flyrotary@lancaironline.net Mailing List Archive

Bill,

The RD-2C uses the Ford 6-pinon planetary, so you would have all six planets in contact with the sun gear at all times. The planets are about 1" wide, so you have 6" tooth contact area.

Another benefit of the planetary design is that the clearances remain constant.

Another benefit is the output shaft is concentric with the eccentric, which helps in packaging.

Mark

On Tue, Jul 28, 2015 at 10:56 AM, Bill Bradburry <flyrotary@lancaironline.net> wrote:

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

From: Mark Steitle [mailto:flyrotary@lancaironline.net]
Sent: Monday, July 27, 2015 7:05 PM
Subject: Re: [FlyRotary] Re: Alternative redrives

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

On Jul 27, 2015, at 2:38 PM, Tom Mann <flyrotary@lancaironline.net> wrote:

That was during the Canard Fly-in at Rough River 2011

http://www.ntsb.gov/_layouts/ntsb.aviation/GeneratePDF.aspx?id=ERA11FA512&rpt=fi

From: Mark Steitle

Sent: Monday, July 27, 2015 2:02 PM

To: Rotary motors in aircraft

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.

Mark

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.

From: Tom Gillespie

Sent: Sunday, July 26, 2015 1:59 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Anyone or everyone in Oshkosh?

Tracy,

    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.

Thanks for your time!

~~~tg~~~

From: Tracy <flyrotary@lancaironline.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sunday, July 26, 2015 10:04 AM
Subject: [FlyRotary] Re: Anyone or everyone in Oshkosh?

The design is royalty free. Anyone who wants to build it is more than welcome.   I can help with info if you need it.

Tracy

Sent from my iPad

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