JiminGA said:
Basically whenever I slow down at the no-wake zone upon entering a marina or boat ramp area the very first thing I do is trim 'er up.
FWIW I ran a fuel computer on my big Parker, with OB on a full transom bracket, and now have a fuel computer on my new-to-me GW Tournament (now the 'Freedom' model) 225G. Trimming UP the OB at headway speeds also increases miles-per-gallon fuel efficiency by a good 20-30%! I'll take that any day of the week
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Other tips using trim tabs. I've found most hulls like a little down trim and have been able to dial in 10-20% more fuel economy by adding a little tab. This is tough to do, of course, without a fuel computer, but here's how I do it if you have one. Once at cruise, trim the OB out until you hear the prop 'vent' and/or the RPMs climb without an increase in speed. Drop the motor in a tad to elimiate the venting. Make note of OB trim setting. Then, if equipped with trim tabs, watch you MPG or fuel GPH burn readout and apply trim tabs. Most likely you will see an increase with tabs deployed for around a 2-4-second DOWN burst.
Another way to save fuel is when using tabs to make the ride more comfortable in a quartering sea. Normally once would drop the nose. Again using the fuel computer, I found dropping the nose to give a good ride can cut MPG a good 10 to 30% from typical, or more!, in a heavy chop or sea. So what I learned to do was to lower the side AWAY from the quartering sea, which raises the side of the hull into the waves out of some of the slop. Doing so, I have actually not only got back to my typical MPG performance, meaning 10-30% increase over where I would have been running if I had not been using a fuel computer, but sometimes can dial-in an extra 10% boost in fuel efficiency, while maintaining an equally pleasant ride!
But a safety note here, you will be running with a heel to the boat, so make dayum sure it's safe for your crew and you and also make sure to level the boat before taking any drastic turns.
I gotta say ... I won't ever run a boat again without
trim tabs and a fuel computer, as the combination is really quite unbeatable!