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Old 03-25-2019, 10:40 AM
Capt. Debbie's Avatar
Capt. Debbie Capt. Debbie is offline
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Join Date: Mar 2008
Location: Suffern NY / Sandy Hook
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Default Re: Proper Trim

You ideally want the prop thrust parallel to surface for maximun cruise efficiency. Not angled up or down at the slightest

HOWEVER getting on plane it should be down. Then back off trimming up when on plane. Bow plowing (trimmed too far down) is inefficient and slows the boat and makes it harder to steer since the buried keel is steering too with each wave it hits.

Get on plane. Set throttle(s) and study your GPS. See what trim does WITHOUT touching throttles. Gaining or lossing mph over the bottom with each touch of button. It will vary as much as 2 knots. REMEMBER you are getting 2 more knots for the same amount of fuel. People misunderstand that throttle position controls fuel fuel flow NOT RPMS

Ideal max efficiency trim is on plane with prop thrust parallel to water surface. No pushing up or down- just straight ahead thrust. No wasted power. If you look back with OB's the top of the O/.B is also flat without incline decline parallel to the water surface.

Additionally sparingly use trim tabs. These run on DRAG. Engine trim is the most efficient.
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Last edited by Capt. Debbie; 03-26-2019 at 11:09 PM..
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