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McCready ring for my PW-5 vario

 
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PJ



Joined: 12 Aug 2004
Posts: 10
Location: SOSA Gliding Club - ON - Canada

PostPosted: Thu Aug 12, 2004 1:01 pm    Post subject: McCready ring for my PW-5 vario Reply with quote

Hello everyone.

This BB is a great idea!

Does anyone know if PZL makes an already maked speed to fly MC ring? Mine came from the factory black.

Thanks
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Jaime Pinto
SOSA Gliding Club
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pinf



Joined: 10 Aug 2004
Posts: 34
Location: Knoxville, TN

PostPosted: Fri Aug 13, 2004 3:44 am    Post subject: Reply with quote

Have you asked Charles Yeates, who is the Swidnick dealer and in your area (Halifax)?
I had mine engraved by a local shop after calculating the speeds from the polar (the 300Kg polar since I fly near that AUW). I could send you a copy if you need.
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Francois Pin - FP
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PJ



Joined: 12 Aug 2004
Posts: 10
Location: SOSA Gliding Club - ON - Canada

PostPosted: Fri Aug 13, 2004 3:23 pm    Post subject: Reply with quote

Please do so. If nothing else I'll do the same.
Please make a link to a picture. I'm sure there are others wondering the same thing.

I also asked Charles, which BTW is in his way to Poland right now. He'll look it up for me. If they have those plates already marked it would be great.

Thanks
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Jaime Pinto
SOSA Gliding Club
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pinf



Joined: 10 Aug 2004
Posts: 34
Location: Knoxville, TN

PostPosted: Mon Aug 16, 2004 3:52 am    Post subject: Reply with quote

It is relatively easy to find from a polar the best speeds to fly while in sink (tangents to the curve at various environmental sink rates, i.e., tangents from points up on the vertical axis from the origin) and arrive at a set of best speed-to-fly for given vario indications (the environmental sink rate in the case of a NETTO-compensated vario, or the environmental sink rate plus the glider sink rate in the case of a regular non-NETTO vario). Here is (hopefully my attempt at inserting a picture will work) a picture of my McCready ring that I derived from the 300 Kg polar for the PW-5 for my regular mechanical PZL vario. I had the numbers engraved by a local shop, but I am sure that stick-on numbers would do, too.


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Francois Pin - FP
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PJ



Joined: 12 Aug 2004
Posts: 10
Location: SOSA Gliding Club - ON - Canada

PostPosted: Mon Aug 16, 2004 12:11 pm    Post subject: Reply with quote

Beautiful!

Thanks from all of us.
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Jaime Pinto
SOSA Gliding Club
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PJ



Joined: 12 Aug 2004
Posts: 10
Location: SOSA Gliding Club - ON - Canada

PostPosted: Tue Aug 24, 2004 1:15 am    Post subject: Reply with quote

I couldn't get the engraving done yet, but here is a temporary solution I came up with over the weekend, using Mylar seal and a bit of patience with the scissors. In flight it works like a charm. (sorry, it's a cell phone picture).


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Jaime Pinto
SOSA Gliding Club
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ptuckey
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Joined: 07 Aug 2004
Posts: 38
Location: Fort Worth, Texas, U.S.A.

PostPosted: Tue Aug 24, 2004 5:12 am    Post subject: Reply with quote

Jaime,

Although Francois' engraved ring is the best way to go, yours looks perfectly serviceable.

It is not always easy to find an engraver who can handle something like speed ring numbers. I used some small white rub-on letters that I got from a model train shop. They are reasonable easy to apply and very easy to read, but unfortunately they are not very durable. I made mine last longer by overcoating them with a clear flat spray paint.

Pat
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Pat Tuckey - I fly PW-5 N105PW "4K"
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PJ



Joined: 12 Aug 2004
Posts: 10
Location: SOSA Gliding Club - ON - Canada

PostPosted: Fri Aug 27, 2004 6:04 pm    Post subject: Reply with quote

I got a shop to do the engraving for me. Very nice!


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Jaime Pinto
SOSA Gliding Club
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pinf



Joined: 10 Aug 2004
Posts: 34
Location: Knoxville, TN

PostPosted: Sat Sep 11, 2004 3:51 pm    Post subject: Reply with quote

Beautiful ring, Jaime. Your engraving shop did a beautiful job.
Some engraving shops will be reluctant to attempt the engraving because of the beveled surface of the ring. I had to make a little jig fixture when I took my ring to my engraving shop to help them setup the engraving area in an horizontal plane.
For those interested in such a jig fixture, I have posted on the WCSA Website a brief writeup about calculating and then engraving a ring, including some discussion of the very simple-to-construct jig that I made for mine. Go to www.wcsa.org (or click the link button above), and check under the section on "PW5 Info"
Happy flights.
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