Offshoreonly.com - expected mph gains?

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26sonic

02-13-2004 08:22 AM

expected mph gains?

3 identical boats one with 500efi( 470pshp) runs 72-73 mph gps ,one with 525sc(490pshp) runs 75 mph gps what would the same boat run with 575 efi (550pshp) ?

ursus

02-13-2004 09:04 AM

I get 79 using old rule of thumb

SQRT (new hp)
----------------------- x Old speed = New speed
SQRT (old Hp)

26sonic

02-14-2004 01:29 PM

ttt

zt260

02-14-2004 04:22 PM

80MPH no more....

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