How to turn thurst into horsepower?

[THE Flying Ace]

I am just curious, but does anyone know how to turn pounds of thrust into horsepower. I remember reading or being told of the forumla, but now I can not find it. Thanks

 

[FlyFlyFly]

I turn thurst into horsepower by having my buddies ride by waving a beer out the window, then I hop on my bike and generate horsepower trying to catch them...

That is my forumla, I am sure others have their answers.

 

[avbug]

Thrust into horsepower? Eat your vitamins.

She will thank you, later.

 

[uwochris]

Thrust Horsepower= Thrust*Velocity/550.

Thrust is in pounds;
Velocity is in feet per second;
THP is in foot-pounds per second.

This is based on the following physics formulas:
Work= Force * distance.
Power= Work/ time.

In the THP formula, Thrust is a force, while velocity represents distance per time.

If you use velocity in knots, then the formula is: T*V/325.

I recommend reading "The Advanced Pilot's Flight Manual" by Kershner. It gets into all those "interesting" formulas

 

[THE Flying Ace]

Thank you, I have that book. And now I will look into it. Thanks again.

 

[Dash8]

I turn thurst into horsepower by having my buddies ride by waving a beer out the window, then I hop on my bike and generate horsepower trying to catch them...

That is my forumla, I am sure others have their answers.

ROFLMAO

 

[Cat Driver]

I own a Cri Cri and it is powered by two 15 hosepower PUL 212 engines.

The airplane has an all up weight limit of 400 pounds.

There are Dutch made model airplane jet engines that produce 50 pounds of thrust, the fuel burn is very high but I could carry enough fuel if I add an extra tank in the belly for about one hour...30 minutes flight with legal VFR reserve.

I am a very limited intelligence pilot so can someone give me some Idea of what kind of performance my Cri Cri would have with two of these jet engines?

Cat Driver

 

[FN FAL]

Thrust Horsepower= Thrust*Velocity/550.

Thrust is in pounds;
Velocity is in feet per second;
THP is in foot-pounds per second.

This is based on the following physics formulas:
Work= Force * distance.
Power= Work/ time.

In the THP formula, Thrust is a force, while velocity represents distance per time.

If you use velocity in knots, then the formula is: T*V/325.

I recommend reading "The Advanced Pilot's Flight Manual" by Kershner. It gets into all those "interesting" formulas

Thank you, I have that book. And now I will look into it. Thanks again.

Ha, it's wonder the current generation of pilots can feed themselves without mum or dad around to make dinner for them. Imagine that, a guy with "Flying Ace" for a screen name possessing a book with the answer in it and being too freaking lazy to open it up.

 

[EagleRJ]

I own a Cri Cri and it is powered by two 15 hosepower PUL 212 engines.

The airplane has an all up weight limit of 400 pounds.

There are Dutch made model airplane jet engines that produce 50 pounds of thrust, the fuel burn is very high but I could carry enough fuel if I add an extra tank in the belly for about one hour...30 minutes flight with legal VFR reserve.

I am a very limited intelligence pilot so can someone give me some Idea of what kind of performance my Cri Cri would have with two of these jet engines?

Cat Driver

The Bede BD5-J weighs about twice what your CriCri weighs, and its engine puts out about 250 pounds of thrust, so it should work. What's the CriCri's Vne?

How about mounting two of those jet engines on each pylon of the CriCri, and then add two more pylons on the tail with two more engines each. Add motors so you can pivot them 90 degrees down using a lever on the throttle quadrant. You could have the first VTOL Cri Cri!
You'd be the first pilot in the world with both Commercial Gyroplane and Powered-Lift ratings!

(Don't mind me...just postulating over an adult beverage!)

 

[sstearns2]

Don't forget to put propeller efficiency in there. You'll loose 10-20% of your Horsepower in the propeller. If you put 200HP into the propeller hub, you'll be lucky to get 180 "thrust horsepower" out of the propeller.



Also that formula is good for higher speeds, over 50 or so knots, but it doesn't work for low or no speed (like static thrust or anything to do with helicopters).



Scott

Thrust Horsepower= Thrust*Velocity/550.

Thrust is in pounds;
Velocity is in feet per second;
THP is in foot-pounds per second.

This is based on the following physics formulas:
Work= Force * distance.
Power= Work/ time.

In the THP formula, Thrust is a force, while velocity represents distance per time.

If you use velocity in knots, then the formula is: T*V/325.

I recommend reading "The Advanced Pilot's Flight Manual" by Kershner. It gets into all those "interesting" formulas

 

[Bus Driver]

Hey guy's it's been a while, so correct me if I'm wrong, but I think we're mixing apples oranges here. Using the ol' PLANK formula the last thing you do is divide by 33,000 for HP/Min. not 550 for HP/Sec. Also the velocity would be exhaust gas not airspeed. This would be a little closer to the length of stroke/number of cyls/rpm thing. With helicopters we start out with SHP which I assume is torque/33,000. Also since we are using velocity in fps I'm not sure that a corection for knots is appropriate.
Thanks