<slipper clutch is a torsional vibration band-aid

 

A friend described his experience with torsional clutch. On approach to airport, engine quit running at idle. Suddenly you drop like a rock due to that tremendous drag. No landing options, you are just going straight down. He got rid of that thing as fast as he could.

 

-al wick

 

From: William Jepson

Sent: Monday, July 27, 2015 3:32 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Alternative redrives

 

I don't disagree. The slipper clutch is a torsional vibration band-aid. The properly designed system makes it totally unneeded.

Bill Jepson

On Jul 27, 2015 3:29 PM, "Charlie England" <flyrotary@lancaironline.net> wrote:

Yes, but that's probably not the best reason to not use the drive. If the clutch weighs as much as an entire drive should weigh, that would be a good reason to stay away. It sounds like they didn't know how to deal with the forces at work, & took a sledge hammer approach at avoiding problems.

 

On Mon, Jul 27, 2015 at 1:21 PM, Bill Bradburry <flyrotary@lancaironline.net> wrote:

Is Geared Drives the company where the owner and his (I think?) daughter were killed in a plane crash?

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Monday, July 27, 2015 11:54 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Alternative redrives

 

I think it’s about 70#’s. This is the  Geared Drives design with a few changes. Oil seal retainer is one.

 

Bobby

 

 

 

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Monday, July 27, 2015 11:31 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Alternative redrives

 

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~~~

 

 

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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

On Jul 25, 2015, at 17:48, Thomas Mann <flyrotary@lancaironline.net> wrote:

Well, barring the passage of the “Affordable Airplane Act” perhaps we should start trying to solve our own problems.

I don’t know what the transaction was regarding production of Tracy’s design but if it’s based off of royalties for every unit sold, I would say that it’s not benefiting anyone.

 

Perhaps a competitive bid is in order?

 

From: Fly Rotary
Sent: ‎Saturday‎, ‎July‎ ‎25‎, ‎2015 ‎2‎:‎38‎ ‎PM
To: Fly Rotary

 

Absent a viable PSRU solution, there probably is no, “rotary engine option”…  :>(

 

B2

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Saturday, July 25, 2015 2:01 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Anyone or everyone in Oshkosh?

 

…… no sign of rotaries.

___________________________________________________________________________

 

What I have found is that if you want there to be a Rotary Engine forum, you have to do it yourself.

If I had a flying Rotary, I would be willing to do this but as I do not, it would not be appropriate.

 

We should make an effort to have a “Fly Rotary” forum and present our case for the Rotary Engine as a viable alternative to the piston solution.

I would propose that this comes from our group rather than as a piggy-back on to any of the other alternative engine groups.

I would not want for our engine solution to be sandwich between the Corvair, Subaru and Volkswagen groups.

 

If you want to see it there, you have to make it happen.

 

T Mann