Re: [PSUBS-MAILIST] How much HP?

[DJACKSON99@aol.com]

Wow! And I need to move 2.5 Tons and I know gas engines HP is often over rated and jet pumps are often considered less efficient. Its incredible how far apart the too books are.  Guess I better start looking at 200 HP.  

Anyone know a Marine Architect that would have a look for cheap of free?

In a message dated 6/15/2003 7:56:05 PM Eastern Standard Time, tlohm@juno.com writes:

> On Sat, 14 Jun 2003 22:37:21 -0400 DJACKSON99@aol.com writes:
> >
> > What I need to know is how much 
> >horse power will be needed in order to get the boat to plane and at 
> >what speed the boat will plane? I am not so interested in going 30 mph 
> >but I do want to be sure that the engine selected can obtain planing 
> >speed.  
> >
> >Length 20 feet
> >Water Line Length: 17 feet
> >Beam: 50 inches
> >Hull: 12 degree V-Hull
> >Draft: Aprox 16 inches
> >Displacement: Aprox 4400 to 4900 (depending on engine weight)
> 
> >From John Teale's book "How to Design a Boat," There's a 
> chart on page 83.   Using the chart:  20 feet and 2.0 tons;.
> from "Transom and very flat stern,"  it looks like 15 knots out
> of 89 horsepower.
> 
> 
> 
> Mike Holt
> 
> >Design Images: 
> >http://members.cox.net/djackson001/sub/Sub_H7_files/Sub_H7.
> htm
> >
> >I certainly appreciate any help!
> >Doug Jackson
> >