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Message-ID: <2e24f88d0705131817n502c1a38yc8a3fd9703375563@mail.gmail.com>
Date: Sun, 13 May 2007 19:17:44 -0600
From: "Hans Conser" <hansconser@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: DKM PIcs
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Lynn, here are a few scans of the DKM motors from John Hege's book The
Wankel Rotary Engine A History.

http://i86.photobucket.com/albums/k114/nucleus33/Wankelwithdkm.jpg

http://i86.photobucket.com/albums/k114/nucleus33/DKMpage.jpg

http://i86.photobucket.com/albums/k114/nucleus33/DKM125Pic.jpg


Hans Conser


On 5/13/07, Lehanover@aol.com <Lehanover@aol.com> wrote:

> Wankel says the shapes involved came to him after Christmas in 1953, and on
> other occasions says he was thinking of it since 1922. He built up two huge
> catalogs of rotary engine and compressor design shapes. The first destroyed
> during the war. So he had exposed himself to the work of others in a grand
> and organized way. He built his catalog based on the types and styles of
> motion involved in the design. Preferring only designs involving pure rotary
> motion.
>
> Wankel was working for NSU designing rotating seals for small engines. NSU
> was making 50CC mopeds. He convinced NSU to support him in his work to
> develop a pure rotary motion engine. He told NSU that he had a deal with
> Borsig to develop both a compressor and an engine in an effort to force NSU
> to back his rotary ideas. His design was the KDM 53. Drehkolbenmotor, or,
> rotary piston engine of 1953.
>
> So he had the two shapes we know of today in 1953. However his proposed
> design had the fuel air mixture moving through the hollow crankshaft as in
> the Le Rhone rotary, and spark plugs installed inside the rotor. The rotor
> housing would rotate in the same direction as the rotor, providing pure
> rotary motion. If you can imagine the outside of the engine spinning and the
> sealing involved to remove exhaust gasses, you can see Wankel's brain
> working as usual. He was known as Germany's sealer, for his work on rotary
> valves for aircraft engines during the war.
>
> But the engineers at NSU chose to work on (in secret from Wankel) an
> earlier shape, where the exterior of the engine was stationary. Wankel had
> discarded this design for its lack of pure rotary motion.
>
> Engineers Walter Froede and Dr. Paschke instead took up work on the KKM or
> Kreiskolbenmotor for circuitous piston engine.
>
> The original design was used as a supercharger on a 50CC NSU motorcycle to
> set a record at Bonneville at close to 120 MPH. Another  engine of 125CC
> produced 21 HP at 15,000 RPM and was run as high as 25,000 RPM.
>
> By 1910 there were over 2,000 patents for rotary engines on file in England,
> probably more in Germany. So, it worked as a compressor. It could be made to
> work in a laboratory with a short life. It was not at all practical for
> automotive use.
>
> Curtis Wright contributed a great amount and Toyo Kogyo  (Mazda) perfected
> the engine to some extent.
>
> When it came time to patent the features of the engine, it was discovered
> that a patent already existed. A Swiss engineer working for Truck Builder
> Saurer, Bernard Maillard had patented the design 11 year earlier. His design
> had the seals fixed in the housings rather than on the rotor tips. Same
> rotor and housing shapes. For reasons unknown, he gave up his rights to NSU.
>
> So who invented the Wankel engine?
>
> Lynn E. Hanover