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Slow Cruising Speed Question
Something's not right. Was the bottom clean? The next thing I'd check is
the size of the props against the original equipment and find out what RPMs they spec'd at WOT. It's hard to believe a hull could be that inefficient but it's certainly possible. You're right about the rpms and secondaries. Normally they open about 3400 rpm and when they do, most fuel consumption curves start to hockey stick. jps "Steve Helling" wrote in message ... I recently did a sea trial on a boat I'm thinking about buying, a 1990 Thompson 288 Adventurer flybridge cruiser with twin 350 mercruiser inboards. I was disappointed to find that at 3200 RPM, trimmed for max speed, it could only make 13-14 knots, as indicated by GPS, and at WOT, around 4800 rpm, it topped out at about 24. This was in glass-smooth protected waters with little wind. The engines seemed to be running fine, but this seems a rather slow boat. It's my understanding that much over 3200 rpm the 4bbl carbs open up and send fuel consumption through the roof. Any thoughts or advice for this beginner? Steve |
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