Re: single step - double step
 

Bigger motors over comes all that :cool:

Re: single step - double step
 

My take is if a boat company can design a boat that goes 90+ with "stockish" power and market it and sell "speed/$$" a fast boat with less power is more profitable.

But in reality it is good we have choices....

IN some ways I wish steps were never brought back in vogue. If nothing else they break up the lines of a boat....

But I am a knob...been here and done this...wish some companys offered 2 versions. :D

Yup bigger motors...like 1050 Sterlings and a 42' non-stepped
Cigarette. Why can't I give this up? :p

Re: single step - double step
 

Yes, Hydrocruiser, this uses the exact same formula. The constants are usually called Crouch constants, named after the guy who came up with the formula, who was also a very famous designer of gold cup and other high speed powerboats in the first half of the 1900's.

By collecting data from boat tests, I find the following constants. NOTE that the constants are sensitive to weight, and as fas as I could tell, all the weights quoted in all boat tests are provided by the manufacturer -- the boats were not weighed by the publication doing the test. Therefore, these numbers are not precise:

1992 Fountain 47, no step: 209
2000 Fountain 47, two big steps: 277
2006 Fountain 47, slightly improved bottom: 284

The early boat needs 50% more power to reach the same speed. That also mean 50% more fuel.

Very similar big double stepped bottoms:
2001+ Fountain 42: 267
2000+ Formula 383: 267
2000+ Cigarette 42 Tiger: 258

My boat, single but pretty big step:
2000 Fountain 32 Sportfish Cruiser: 245

Non-stepped bottoms:
Baja 442: 237
Excalibur 47: 236

Big fat tubby powerboats:
Cruiser 405: 200

Playing with the numbers to compare my fuel burn this weekend with a theoretical identical boat with no step, and two steps:
No step: $275
One step: $235 <- actual
Two step: $215

Re: single step - double step
 

If it's not fast enough change pulleys! :drink:
Dan