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Old 16 September 2012, 14:40   #11
ncp
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Country: USA
Town: California
Make: Avon 5.4m Searider
Length: 5m +
Engine: Yamaha 90
Join Date: Aug 2011
Posts: 1,187
17 1/4 x 23 @2650rpm, 36mph, 10.81% slip
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Old 07 October 2012, 01:12   #12
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Country: USA
Town: Hood River
Boat name: Seal Team 7
Make: Zodiac SRA-750
Length: 7m +
Engine: Evinrude ETEC G2 300
MMSI: WDI 8895
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Now I'm running the 17 1/4 23 as well.

I just clocked 30kts or 34.5mph at 2650, but the real improvement is between 1900-2400 rpm.

2300 rpm
mph kts mpg
29.33 25.50 3.5
So this is very close to the numbers quoted.

And then nice economy at 1900

1900 rpm
21.3 mph 4.43 mph

2100 is the real sweet spot for economical speed and the boat is really happy here.

2100
25.9 mph 4.11 mph
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