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Just found this - UAV engines from Silver Arrow
Submitted by Charles Wilson on Tuesday, May 15, 2007 - 4:28pm


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Update on this symposium series
January 11, 2008 - 8:24pm
Charles Wilson's link is to a paper in PowerPoint format from the 6th Annual Israeli Jet Engine Symposium (AIJES), held in November 2006. Papers from the 4th and 5th symposia are available online, but this example is the only one relevant to the rotary engine. The intent was to show that in UAV applications this prototype rotary is competitive with a small turbine.

A few days ago I e-mailed the AIJES coordinator, Dr. Y. Levy, to ask about the 7th AIJES, which should have been held a couple of months ago. He responded that he had been gravely ill and therefore unable to organize the symposium in 2007, but he is recuperating and hopes to get back on schedule with it this fall. We'll see if any more UAV rotary engine papers appear then. :)
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Re: Just found this - UAV engines from Silver Arrow
May 28, 2007 - 1:19pm
Good find. Elbit, the parent company of Silver Arrow, also controls UAV Engines Ltd (UEL) in Britain, which builds the old Norton rotaries for unmanned aerial vehicles (UAVs).

The other ex-Norton operation, Mid West Aero Engines (MWAE), is now in Europe under Diamond. MWAE made engines certified for passenger-carrying aircraft. Diamond has shut down the old MWAE website, and new info is simply unavailable now to my knowledge.

I diddled around the Technion site by playing with URLs and examined the other papers from this symposium, but the link given is the only rotary paper. These annual symposia in Israel are primarily dedicated to gas turbines.

Note that the paper references a new engine, the R802, based on the Norton tooling, but with a greater rotor width. The new engine does not yet appear on the UEL website, and it is clear from the paper that it is still under development. This makes three UAV engines based on the ex-Norton tooling:

Rotor dimensions: radius = R, eccentricity = e, width = B or W

In all cases: R = 71.5 mm, e = 11.6 mm

208 cc/rotor: B = 48.2 mm: smaller engine with lower power for drones
294 cc/rotor: B = 68.2 mm: standard engine; 2-rotor 588 cc used in bikes
350 cc/rotor: B = 81.2 mm: new R802 engine in paper linked above

This follows the Mazda approach in the past of using the same rotor dimensions but changing the width, which is the easiest dimension to modify because it does not require epitrochoid changes. This created the 10A/12A/13B/RENESIS family, with even larger versions proposed but never put into production.

Hope this helps you rotorheads out there. :)
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