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Date: Mon, 11 Dec 2006 22:46:42 -0700
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Backflow preventer
Message-Id: <20061211224642.047dba92.rlwhite@comcast.net>
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OK, what do you use it for? and what have you been reading lately?  Old
English novels maybe?  YHS indeed!

I particularly like the technical terms 'insy' and 'outsy'. 

Bob W.


On Tue, 12 Dec 2006 02:38:21 -0500
Ernest Christley <echristley@nc.rr.com> wrote:

> My fellow Rotarians, and any other that would dare fly behind the
> Triangle of Cast-Iron, I submit for your perusal and intrepid
> consideration what may very well be the lightest, the cheapest, and,
> dare I say, the easiest Wye fitting and backflow preventer yet presented
> in these fair halls.  After much consideration, soul searching, and
> homemade spirits, this device was designed and constructed in a single
> evening session by your humble servant.  Fashioned from lightweight
> aluminum components, available off the shelf in many well stocked
> venues, I choose now to provide you with instruction and necessary
> elocution that will make it possible for you to experience the pleasure
> of constructing such a simple, albeit functional, device.
> 
> The primary parts were ordered at once from one McMaster Carr.  The
> order consisted of:
> - two 3/4" hose barb fittings for $6.84 each
> - two 1" to 3/4" couplers at $3.80 each
> - a 1" Tee, for $8.98
> - and a single 1" hose barb for $6.84
> The remainder of the  materials consisted of a scrap of .100 aluminum, a
> 4" lenght of 1/4" threaded rod, two nuts, two washers, and a little heat
> shrink; all free material as surely intrepid builders and inventors such
> as ourselves have this sort of crap lying all over the place.
> 
> A 1-1/2" hole saw with a 1/4" guiding bit was first used to obtain a
> disk of the aluminum scrap.  The sides must be flattened so that it will
> slide into the center of the T.  Spin a nut halfway down the rod, add a
> washer, then slip it into the plate through one arm of the Tee.   Apply
> the other washer and nut from the other arm, and squeeze the plate in
> the middle.  A wrench through the leg of the Tee, and a deep well socket
> through one of the arms is the prescription for the necessary locking
> force.  Heat shrink the rod extensions to both protect the inside of the
> aluminum fittings and to smooth the water flow.  What you will have for
> your slight trouble, is a 17oz device that will automatically keep insy
> water from flowing through the outsy port.
> 
> 


-- 
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
First Flight:  11/23/2006 7:50AM - 0.7 Hours Total Time
Cables for your rotary installation - http://www.roblinphoto.com/shop/