# Recent Content by hwsiii

### Prop Efficiency Formulas

Prop Efficiency Formulas Please Help I am trying to find if there is more than one formula for finding the efficiency of a prop, NOT the...
Thread by: hwsiii, Feb 28, 2010, 4 replies, in forum: Props
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### Can a motor produce the same HP at different RPM with different Loads

Gentlemen I appreciate your time and answers very much. The only reasons y'all are disagreeing so much is My fault. I tried to state the problem...
Post by: hwsiii, Jan 27, 2010 in forum: Props
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### Can a motor produce the same HP at different RPM with different Loads

Hough, would you please show me how you arrived at the statement that says, I will also agree with your statement that I do agree with...
Post by: hwsiii, Jan 25, 2010 in forum: Props
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### Can a motor produce the same HP at different RPM with different Loads

I am sorry everyone, I did not give you all of the correct information for you to do a full analysis of the problem. I was having a discussion...
Post by: hwsiii, Jan 24, 2010 in forum: Props
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### Can a motor produce the same HP at different RPM with different Loads

Yellowjacket, here is the Motor analysis worksheet, and the HP at each RPM is directly from the manufacturers HP curve. [IMG] H
Post by: hwsiii, Jan 23, 2010 in forum: Props
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### Can a motor produce the same HP at different RPM with different Loads

Apex here are power curves for this motor with different props, maybe this will help. Prop 1 [IMG] Prop 2 [IMG] Prop 3 [IMG] I was told...
Post by: hwsiii, Jan 23, 2010 in forum: Props
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### Can a motor produce the same HP at different RPM with different Loads

Apex it is a 350 Mercruiser, and the peak Torque is 370 lbft at 3,200 RPM, with maximum HP at 4,800 RPM of 292 HP. H
Post by: hwsiii, Jan 23, 2010 in forum: Props

### Can a motor produce the same HP at different RPM with different Loads

My question is can a 292 HP motor produce 280 HP at 5,000 RPM and also produce that same 280 HP at 4,130 RPM. If that is true then my next...
Thread by: hwsiii, Jan 23, 2010, 40 replies, in forum: Props
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### Propellar question

Wynand, You also might try reading this for a better understanding of changing props for better performance....
Post by: hwsiii, Dec 8, 2009 in forum: Props
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### Can anyone give me some pointers/opinons on designing a 8m motorboat?

Newkid1, if you will look at Bateau I am sure you can find something that will fit your desire for a home built boat. Jacques, has many proven...
Post by: hwsiii, Dec 7, 2009 in forum: Boat Design
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### Help with Prop specs

Allen,you need to remove 2" of pitch to get your motor to 4,800 RPM. H
Post by: hwsiii, Dec 1, 2009 in forum: Props
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### Prismatic Coefficient

Ad Hoc, can you please post the formula with that diagram. H
Post by: hwsiii, Aug 9, 2009 in forum: Boat Design