1m 8sLength
Exciting twilight steam traction engine dyno run. WMSTR's Rumely 2-cylinder steam tractor on the Prony Brake at the WMSTR show in Rollag, Minnesota USA. The announcer is reading the scale on the brake. After doing the math, the result was about 130 HP (97 kW) and 3,400 ft-lbs (4610 Nm) of torque. This type of steam engine can produce maximum torque at any RPM. The Prony Brake is an early form of dynamometer See http://en.wikipedia.org/wiki/De_Prony_brake
Comments
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The beauty of steam is it produces it's max torque from 0 RPM all the way to full power
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what you said is not true. that's not the reason cellphone have a short life.
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I believe this is how the steam enthusiast relax enjoy life and on occasion blow off sum steam....
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What e beast!
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I've seen a couple of old steam tractors in person. While they ran. Amazing.
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Western Minnesota Steam Threashers Reunion rocks every year on Labor Day weekend in Rollag, MN!
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that is incredible
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@mweverett Have you made it yet?
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Rollag (the show) has grown a lot. I try and make it back every few years & hope to this Labor Day. It almost seems like it's getting big enough to expand the dates, but then again, most all the operators plan their year around the "Labor Day" weeks & it's all volunteers, so it might be safe from going commercial. Any steam or gas engine fans who have not attended the "Western Minnesota Steam Threshers Reunion" (WMSTR) at Rollag MN on Labor Day weekend, you are missing out! Do a Google search!
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@logic2reason You're right, at twice the rpm with the same torque, you are generating 2x more power (hp). I think the way these tractors (or the steam engine itself) are setup is different than conventional engines, in that they generate more power as the load is increased until they hit a max ceiling, through some kind of governor (which acts as a kind of secondary throttle?) to keep the power output at a certain level the driver desires (like cruise control for a car's speed)?
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whats the video called?
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In ground tests, these guys measured the drawbar HP of this tractor at 94 HP. They said it will "put on a line pull of 25,000 lbs at 2 MPH."
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I think it's a 1912 or so.
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how old is this thing?
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That's the interesting thing about steam engines. Horse power is not relative to speed. With and internal combustion engine, maximum horsepower is only achieved at a certain speed. With a steam engine, the horsepower is the same no matter how fast it is going. Same with an electric motor.
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true, but using gears is really poor. It's better using a big slow engine which is naturally full of torque instead of a fast running low torque engine like a F1. It will live much longer when running slow. Look at the fast engines how they die fast. Today diesel engine like those on tractors can run 15000 hours or even more. A car engine will live 300000 kms maximum. When you say it was driven at 100 km/h average (which is a fast average) it holds 3000 hours. lol
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They say it pulls about as hard as a medium-large sized modern bulldozer. See the first couple minutes of my "Torque and HP Explained" video for a description of how they tested the drawbar HP of this tractor.
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Nice finish with the two little blips on the whistle. Great video.
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A trip to Rollag has been on my agenda for several years. But I get a yawn from the wife when I mention it. Got a new neighbor though who is as big a gear head as I am. Sooo.... Mark
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I highly recommend it! This is just the tip of the iceberg, you really have to see the place to believe it.