Fuel Efficency

[mistercomputerman]

OK... Here's the discussion from some time ago:

http://clubsearay.com/forum/showthread.php?t=12607&highlight=yachting

The guy from Yachting magazine had his head up his ass...

Sorta like that guy that worked for Boeing or something and talked about wave drag on boats and how the stern would rise out of the water or some crap like that... he had a 240 DA if I recall... lived out west... wait a minute...

I heard there was a guy in Arizona or somewhere that fit that description...

 

[Arizona240DA]

Still hitting a nerve with you am I Gary? Sad really...

Why the subtleties, why not hit me head on. Let me guess, strategy?

Jackball comes to mind; I‘m not sure if that is worthy of an infraction or not?

OK... Here's the discussion from some time ago:

http://clubsearay.com/forum/showthread.php?t=12607&highlight=yachting

The guy from Yachting magazine had his head up his ass...

Sorta like that guy that worked for Boeing or something and talked about wave drag on boats and how the stern would rise out of the water or some crap like that... he had a 240 DA if I recall... lived out west... wait a minute...

 

[promocop]

FYI...the Newport Boats service maven called and confirmed that all else being equal...3500 RPM's is the sweet spot for the 390 dancer

 

[jkpruitt]

I prefer, don't ask, don't tell!

 

[rwvw415]

I agree I have a gas 390 in fresh water and 3500 rpm is my sweet spot for the best fuel burn at the highest speed.

 

[melida]

+1 Mr Salt.

I recall the hull speed formula for a displacement hull (think sailboat, cruise ship, etc) is:

Hull speed = Square root of waterline length multiplied by 1.34.

This gives you the theoretical hull speed in knots in a displacement cruise.

Hi
According to this formula my boat is 280DA/315 LOA 9,47 m LWL 8m so √8x1,34=3,2 knot? or √8 x 1,34=3,79knot?
or the lengt in terms of foot √26x1,34=5,9 or √26 x 1,34=6,83 ?
thanks a lot