Thread: Under propped?
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Old 03-27-2014, 09:36 AM   #38
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City: Cape Coral FL\Grand Island NY
Country: US
Vessel Name: Missy
Vessel Model: 1997 Mainship 350
Join Date: Jun 2013
Posts: 190
Our CAT 3116 has a recreational "E" rating, max RPM 2800, cruise 2400. However the 2400 spec is way to high for how we use the boat. At 2400 she is plowing along at 10 knots trying to get up on plane, burning 9.7 GPH. We have found our sweet spot a 1600-1800, which gets us 7 or 8 knots burning a bit over 3gph. I think most of the turbo charged diesels are cruise rated for planing boats, not FD or SD trawlers. Contrary to popular legend, we have found no issues with running our CAT at the slower speeds. Almost 2k hours on the clock now with no problems.
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