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Old 12-15-2015, 03:01 PM   #19
City: Carefree, Arizona
Country: usa
Vessel Name: sunchaser V
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 8,254
Originally Posted by Baker View Post
The boost comes on about 2200rpm....obviously depending on load but I am willing to be it would be right around there. Anyway, much like the 4236 is considered Perkins best engine....this engine is held in the same regard as it relates to Yanmars.
The vessel is designed to cruise comfortably at around 7.7 - 8.2 knots. At 7.7 in flat water the total HP required is no more than 40 per engine. Just guessing, 1900 or so RPM should do it. Top speed, hull limited, is about 11 kts with 8.5 the high end of the economical cruise range before boost climbs up on my engines.

But, survey and sea trial will reveal the prop/RPM/load data for these engines.
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