relation of Engine HP to RPM

how can we relate the engine's horsepower to its rpm? without any given torque.. is there any formula for this? thanks and kind regards.

 

Hi,

check this post, might help you: http://www.boatdesign.net/forums/di...ed-small-disp-diesels-25338-2.html#post254035

Cheers

 

You may find this of assistance too:
http://www.boatdesign.net/forums/props/propeller-calculations-help-45742-3.html#post604927

 

In general, smaller engines can rotate at higher rpms without flying apart.

 

horsepower is the rate at which it holds a given torque. You have no hp without torque.

hp is in direct relationship to both torque and rpm, you can not related it to rpm only without reference to a torque value.

 

hp = T x RPM / 5252

For each given hp and rpm there is a corresponding torque.

 

The formula shows that at 5252 RPM HP=torque in ft/lbs

 

Simply by looking at it's RPM to hp curve (graph).

 

I think that it pretty much it. Otherwise, torque and RPM are the two variables in the formula for HP.