Horsepower to torque

T=((5252*HP)/RPM)

The units are foot-pounds.

that formula does not take into account any friction losses. a straight 1:1.

Thanks very much for your help guys.

Much appreciated

scott

All answers look fine, as I'm a perfectionist, let's try the calculation is SI-units:

150 hp = 111.855 kW

8000 RPM = 133.333 / sec

If all variables in SI-units, then

P = 2 * pi * n * torque ==> torque = P / (2 * pi * n)

so torque = (111.855 * 1000 W) / (2 * 3.141592654 * 133.333 * ( 1 / sec)) = 133.517 Nm

on the same subject can someone tell me the definition of 'mean torque' and 'transient torque' ?

thanks in advance

also confirmation of what 'micro strain' is and how is it relevant to my project - what do i need to bear in mind - and mV/V - i've had various specifications thrown at me.. again what do I need to take into account.. ?

Sorry... this is a totally new field to me guys..

Not sure about microstrain, but it appears to be related to material examination techniques. Unfortunately, I'm not familiar with strain gauges.

See http://en.wiktionary.org/wiki/Transwiki:Microstrain

Mean torque = the average amount of torque over a number of revolutions. Mostly, this is based on the nominal power output of your application.

Transient torque = the max. amount of torque your application is expected to endure over its lifetime for a limited number of times. When you have an application that needs to reverse torque every now and then, then you estimate the number of times this could happen during its lifespan. Many standardized calculation techniques take this number and the peak torque in account for rating purposes.

So transient torque is the amount of torque your appication needs to survive during short term operation (mostly during changing conditions like changing rotation direction or sudden accelerations, hence the term "transient") or at unusual circumstances for a limited number of times.

Thank you very much.. I really do appraciate all of your help.