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Help needed understanding turbojets
rec.aviation.homebuilt
Help needed understanding turbojets Horsepower is defined/measured as 550 foot pounds per second. ie, lifting 1 pound 550 feet every second is 1 hp. If you lift 550 pounds one foot every second and keep that going for 12 hours or so every day, you are a horse. Similarly, an airplane with a one horsepower engine that travels at 550 feet per second at full power is pushing with the force of one pound. Conversally, as above, if the plane's max speed is 1 foot per second the thrust is 550 pounds. Handy for gauging such questions. Hul |
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Help needed understanding turbojets
On Sat, 20 Jun 2009 13:13:43 +0000 (UTC), Hul Tytus
wrote: rec.aviation.homebuilt Help needed understanding turbojets Horsepower is defined/measured as 550 foot pounds per second. ie, lifting 1 pound 550 feet every second is 1 hp. If you lift 550 pounds one foot every second and keep that going for 12 hours or so every day, you are a horse. Similarly, an airplane with a one horsepower engine that travels at 550 feet per second at full power is pushing with the force of one pound. Conversally, as above, if the plane's max speed is 1 foot per second the thrust is 550 pounds. Handy for gauging such questions. Hul I thought it was originally defined as lifting a Ton a Foot a Minute. ie what a shire horse could achieve lifting stuff out of a mine on a windlass. |
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Help needed understanding turbojets
Stealth Pilot wrote:
On Sat, 20 Jun 2009 13:13:43 +0000 (UTC), Hul Tytus wrote: rec.aviation.homebuilt Help needed understanding turbojets Horsepower is defined/measured as 550 foot pounds per second. ie, lifting 1 pound 550 feet every second is 1 hp. If you lift 550 pounds one foot every second and keep that going for 12 hours or so every day, you are a horse. Similarly, an airplane with a one horsepower engine that travels at 550 feet per second at full power is pushing with the force of one pound. Conversally, as above, if the plane's max speed is 1 foot per second the thrust is 550 pounds. Handy for gauging such questions. Hul I thought it was originally defined as lifting a Ton a Foot a Minute. ie what a shire horse could achieve lifting stuff out of a mine on a windlass. I think you dropped a zero. 1 HP = 33000 ft.lb/min or about 15 ft.tons/min But a shire horse can really manage about 10 ft.tons/minute, without Watt's fudge factor. Brian W |
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