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Old 05-20-2008, 04:11 PM   #11
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That's kinda good to hear. Good because it means I'm not alone with this 'issue'. Not good because you're probably losing performance and economy by not being able to trim your drive. I know that when I get to about 2/3 between the hash marks that on calm water I will have gained almost 10mph over fully drimmed in. If I understand it correctly, that's basically free speed since I haven't adjusted the throttle at all to gain it. I could be wrong about that and I'm sure there is some difference in fuel usage since I'm turning higher RPMs at that point, but it's got to be more efficient, right?
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Old 05-20-2008, 04:40 PM   #12
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Originally Posted by TBarCYa
That's kinda good to hear. Good because it means I'm not alone with this 'issue'. Not good because you're probably losing performance and economy by not being able to trim your drive. I know that when I get to about 2/3 between the hash marks that on calm water I will have gained almost 10mph over fully drimmed in. If I understand it correctly, that's basically free speed since I haven't adjusted the throttle at all to gain it. I could be wrong about that and I'm sure there is some difference in fuel usage since I'm turning higher RPMs at that point, but it's got to be more efficient, right?
Yep. The resistance of water on a deep hull boat is immense, thus the reason it takes 4000 rpm (and the gas to feed 4000rpms) in order to get and keep our boats at 40mph.
The more you can trim the boat so that it becomes more parallel with the water, the more efficient it is and the less resistance you need to overcome.
that's why some smart fella's invented hydroplanes, so that the hulls are up, out of the water and away from all that frictional resistance.
The problem with small boats like ours is that they are very susceptible to external forces i.e. chop. Chop throws trimming out the window on small boats.
That's why I don't even bother unless the water is glass. Now, I have heard from many that trim tabs help but it's just not that big of deal to me due to the water we boat on now. Now if I were on a smooth lake all the time it would be a different story.
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