Looking at 56 Hat's 8V92's Problem??

[Trojan]

My boilers produced steam not heat. The fire box did that. What happened to the torque ranges? The HP does not move the boat the torque does. You should prop for the best torque if you want to be efficient. In all cases you are loosing torque at WOT and are trying to make up for it with brute HP. That is where the over load comes in at and why you prop for WOT.


BILL

[Brian Degulis]

Props are always sized based on RPM Reduction Ratio and HP. Boats are driven by HP which is a total measurment of mechanical force very much like watts is a total measurement of electricity. RPM is similiar to volts and torque is similiar to amps. If you want to know the torque you can easily calculate it if you know the HP and RPM. Just like electricty if you know 2 of the values you can always calculate the third.

Boats are proped for WOT (or not) for all the reasons stated in previous posts it has nothing directly to do with torque.

The power curves don't take into acount prop size or reduction ratio because for the purpose of calculating what an engine is capable of it doesn't matter. It could be a large wheel turning slow requiring high torqre delivered from a deep reduction. Or a small wheel turning fast requiring little or no reduction. It's still based on a total measurment of power expressed as HP.

If for some reason you had an engine that was low on torque at a certain RPM range then that would be reflected in the HP rating in the curve at that range. If the torque drops off and the RPM remains the same then the HP must drop.

Brian