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Old 12-23-2006, 12:19 PM
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jrf
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Default RE: Ultrasport 1000 on GAS?

Go to http://www.bmaps.net/ and click the "Goodies" tab. It is very interesting to see the differences between a large, low pitch prop and a smaller, high pitch prop on the same engine.

The ST 90 on glow is rated at 2.5 hp at 14,800 rpm, but in reality it will turn a 13x6 about 11,500, on a good day. (They have good days and bad days.) Using ThrustHP again, that is around 1.9 horsepower and 10.7 pounds of thrust. Simple physics will tell you that the gas version can never make more power than the glow version.

Never believe the horsepower ratings given by the manufacturers.

Jim