flyrotary@lancaironline.net Mailing List Archive

Great idea, Bill

I thought of that also.

I kinda wanted to let the prsu remain virgin until I mounted it on the engine after rebuild.

What I did today was using a caliper made measurements of the front disk, shaft,outside measurements of the bolt circle diameter, distance between the close bolts, distance between far bolts (all outside of head to outside of head) and the diameter of a ale bolt head

With these measurements I should be able to recreate the bolt pattern successfully. I was just hoping somebody else had done it before me ( I hate reinventing the wheel-- or prop

When I do the calcs make the piece and fit it , I will post it. Probably some time this winter when I tear into the engine

Thanks for your help

Rich

Sent from my iPhone

On Sep 5, 2015, at 10:31 AM, Bill Schertz <flyrotary@lancaironline.net> wrote:

Why not remove the three Allen head screws you are going to use, take a piece of thin poster board or vellum, and do a pencil rub to get the impression of the holes, then use this as a template?

Bill Schertz

From: Bill Bradburry

Sent: Saturday, September 05, 2015 7:12 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: redrive question

Rich,

I think the only one who would have that measurement is whoever has the plans for the PSRU. You will probably have to measure your PSRU in order to get the measurements. The other possibility is that whoever built that plane in one of Bobby’s pictures. I don’t know whose plane it is, but I suspect it is either Bobby’s or Mark Steitle’s. They probably just made the plate to fit and don’t have the measurements.

Bill

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, September 04, 2015 10:47 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: redrive question

Thanks, Bill

Almost

In Tracy's prsu, the forward oil seal is in a circular aluminum piece which is attached to the prsu by several Allen bolts which are arranged in groups of two. What I was looking for is the diameter of the bolt circle and the spacing of those bolts

My bracket will be a flat steel plate affixed to the front of this plate using 3 of the bolts. The brush/rpm sensor will be connected through an ear on this plate

Thanks,

Rich

Sent from my iPhone

On Sep 4, 2015, at 8:44 PM, Bill Bradburry <flyrotary@lancaironline.net> wrote:

Rich,

If I understand what you are asking, I think Tracy’s PSRU has a SAE 2 flange. The dimensions are in this gif.

http://acsproducts.co/wp-content/uploads/2013/07/as127.gif

Bill

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, September 04, 2015 6:29 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: redrive question

Thanks bobby,

I have already designed the mounting plate

All I really need is the spacing of the bolts so I can make the fixture before I disassemble the prsu

Rich

Sent from my iPhone

On Sep 4, 2015, at 12:42 PM, Bobby J. Hughes <flyrotary@lancaironline.net> wrote:

Two examples for MT props.

http://www.trv7.com/2009/RotorFest09/RotorFest09-91.jpg

http://www.trv7.com/2009/RotorFest09/RotorFest09-82.jpg

Bobby

Sent from my iPad

On Sep 4, 2015, at 11:34 AM, A R Goldman <flyrotary@lancaironline.net> wrote:

Greetings gentle people,

Does any body have a diagram (and measurements) for the bolt pattern of the front plate of Tracy's rd1-c prsu

I want to make a bracket to hold a ivo brush assembly.

Thanks in advance

Rich
Sent from my iPhone

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