Oshkosh supprise -- D-Motor Aircraft Engine Users Forum

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Date Posted: 14:13:09 08/08/11 Mon
Author: Bob Widmer
Subject: Oshkosh supprise

Walking down the Light Sport lane I spy this "A" frame thing with a scale and an engine hanging from it with two mufflers and a radiator. I was blown away seeing a flathead AC engine. The man at the site had a sign that stated it weighed 103 pounds. <a rel=nofollow target=_blank href="http://eaa.org/news/2010/images/dmotor2.jpgI">http://eaa.org/news/2010/images/dmotor2.jpgI</a> said "what"? He said grab it here and pick it up, which I did. He said that the additional oil tank, coolant, and oil made for about the same weight as a fully equipped Rotax 582 with starter, gearbox, coolant, muffler, and only worth 65 horsepower.

What a novel idea. I fly an Easy Rizer with a Briggs & Stratton flathead twin. It has served my well for about 20 years of occasional flying <a rel=nofollow target=_blank href="http://www.youtube.com/watch?v=E8xF-myj0gM"">http://www.youtube.com/watch?v=E8xF-myj0gM"</a>

Now, with fuel injection, electronic ignition, and being liquid cooled, This may be the engine I am looking for for two reasons. The first is that I want a light, strong liquid cooled engine for a future Highlander project. Second is that I have been looking for a suitable engine for a Rans S-9 or S-10 that can be used for aerobatics. I have been using a Rotax 670 snowmobile engine which packs a lot of horsepower, but it is not reliable enough for me to feel comfortable making a long flight. The D-Motor is a dry sump and can easily be made to operate upside down more simply than a Rotax 912S.

The guy said the price is $15,000 which seems a little high if they want to cut deeply into the Rotax market. Nothing like a cheaper, better mousetrap. At $12,000 they won't be able to make them fast enough. Rotax makes a fine engine, but is not only too expensive, it is also complicated compared to the new D-Motor.

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