Rick Ansell wrote: > I think that the article was referring to net thrust from the > propellor-powerplant combination. 2000lb of engine ;power' doesn't > necessarily make for 2000lb of thrust from the prop.
Actually, 2000 pounds of thrust doesn't sound that far off. To start with an intuitive argument: 2000 lbs is about half of what a light bizjet of the same weight as the Mustang gets, so we're not too far from the right ballpark. More numerically: The engine is listed as 1590 horsepower. Figure that it can develop that power at sea level while going at 360 knots (~180m/s). One HP is 745 watts, and figure about 80% efficiency (peak for most propellers is 85%) so we have: 1590 * 745 * 0.8 / 180 = 5264 Newtons == 1180 pounds of force. That's at max speed. If you develop the same power and get the same prop efficiency at 200 knots (which is still well within a "normal" environment), then you'll see 2000 pounds from the prop. Andy _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
