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Moped Riders Association • View topic - Your Comments? 300 mpg achieved in 1929??

Your Comments? 300 mpg achieved in 1929??

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re: Your Comments? 300 mpg achieved in 1929??

Postby samsporter » Thu May 18, 2006 12:19 pm

I dated a girl from Germany back in 1997 and visited her parents. Her father, Dieter Schager was working on his version of a Stirling motor and what he had made, was what he called the Schager Handewarme-Motor. He had about 15 of these little things around the house. They drew the energy in the form of the heat from the palm of your hand. One of them he had he put a piece of felt on the top and wet the felt with a few drops of water and it ran by itself without the use of your hand to warm the bottom of it. The motors operated on a temperature difference in air that expands and contracts in a displacement cylinder that then uses a displacement piston to push the expanded air into a "arbeiten" or work cylinder. The water powered motor was started when I arrived at their home and it ran continuously for the five weeks that I was there, we would squirt just a few drops of water onto the felt pad every morning just enough to keep it wet. In that time it used up less than two ounces of water. He had also built a Stirling motor that used butane as fuel, this one he made has the world record for being the smallest combustion engine. The entire engine on its' little wood block was 1/4" wide and 1/2" long and idled at about 8,000 rpm he affectionately called it "my honey bee" because it sounded like a flying insect at idle. He also made a Stirling motor that he claimed was the simplest and had the fewest moving parts. This one he made out of a glass test tube with two pistons in it. The test tube was mounted horizontally and the displacement piston was toward the sealed end and was not connected to anything and allowed air to move around it, and the work piston was at the open end and had a seal around the edge of it and was connected to a crank and flywheel. A flame was put under the tip of the sealed end to heat up the air, when the heated air expanded it pushed its way around the displacement piston and forced the work piston outward and the displacement piston inward (toward the sealed end). Then the air cooled and created a vacuum that drew it back around the displacement piston, moving the displacement piston back toward the open end of the tube and "sucked" the work piston inward. If only this type of motor could produce enough power to do more than turn a flywheel the applications would be limitless.
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re: Your Comments? 300 mpg achieved in 1929??

Postby samsporter » Thu May 18, 2006 3:10 pm

I found some pics of Stirling Motors by Deiter Schager-
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History Of some 'New Energy' inventors

Postby Micronaut » Mon Jun 19, 2006 8:22 pm

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re: Your Comments? 300 mpg achieved in 1929??

Postby Grant Connor » Mon Nov 27, 2006 10:08 pm

I am always amused by claims for fantasticly efficient engines or electric motors. I have experimented with permanent magnet DC motors since the 1960s and studied mechanical engineering in college. My father-in-law holds several patents and is a lifetime motorcycle rider. The Pogue and Fish carbs have been legend for decades. The plain truth is that gasoline burns best at 18:1 air-fuel mixture and a gallon of gasolene holds a finite amount of energy. You can buy a 200+mpg carb for a chain saw or weed wacker engine, mine is on a 1 hp 2 stroke chain saw engine built in Canada for a bike motor set up. Fuel injection does work better as in the Aprilia DiTech. To expect an Otto cycle engine that is 25% efficient to move a two ton car shaped like a brick down the road at 55 mph on thimble of fuel is not realistic. Anyone with a high school science diploma should be able calculate the energy required to move a car. We can document the engine system of Smokey Yunick of Jacksonville, FL. The Nascar mechanic built an engine from half of a Buick 231 CI V6. The three cylinders were fed by vaporized fuel compressed by a turbocharger. The engine in a GM X body chassis produced 53 mpg highway and satisfactory acceleration. Negotiations with the Big Three automakers broke down over royalty rights. The biggest concern of the automakers is cost vs profits in a competitive market. Honda and Toyota have the edge in the small car market in part because of their quality.

The keys to high efficiency vehicles starts with low air drag and light weight. The mopeds and scooters have an opportunity to get 500 mpg at 30 mph with available technology. The "secret" is to use a fairing or body that reduces the drag coefficient to less than .2 from .65 of a normal upright rider. Start with Craig Vetter's version of the Yamaha Rifle fiberglass fairing. Then look at the human powered vehicles as in the site adventuresofgreg.com or WISIL and back issues of Scientific American (see page 142 of December 1983). There are kits for electric motors to convert motorcycle to electric power and several companies produce 200 to 250 cc single cylinder diesel engines. Hatz has been the favorite for the European economy contests. A hybrid system is within the reach of the average handyman.

The next time you are out for a ride count how many cars and trucks have only the driver in them. Do the math and smile all the way home.
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