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Old 08-01-2015, 05:22 AM   #46
gaston
Guru
 
City: Sydney
Country: Australia
Join Date: Jul 2015
Posts: 1,603
Interesting thread

30ft 4.5 ton 120hp Perkins (max speed 10knots )1100rpm 6.8knots 2gph engine is smooth little vibration

Same boat 165 turbo Volvo (max speed 15 knots just on the plane) 1600rpm 7knots a touch under 3 gph engine feels to be under load


Suppose you need to take into consideration gear ratio and prop pitch
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