Trim tabs with twin engines?

Phil -

Sorry this post sat for so long without anybody noticing.

Unless you are having cavitation or ventilation problems, I don't think you would want any changes. If you're running flat all the time, and are good with it, then a foil will probably cost you some economy rather than save. If you do have some prop ventilation going on, and the motor height is good, then maybe the foil would have some benefit. But as I recall from running Brydman's TC when it was Dusty's TC, even on hard turns the props never lost their bite, and he didn't have foils.
 
On my twin 50s I do have this cavitation problem, in turns, sometimes even going straight ahead at 10 to 14 knots my engines change noise without changing the RPM. When you mention the height of the engines could it be that the dealer had installed them the wrong way? My C-Dory was the first C-Dory boat sold by my dealer on this Island. Is it that the C-Dory would be different than other type of hulls for height on the leg. The Dealer sells all kind of boats Orca's, Campion's, Double Eagle's, Grady White's to mention a few. You would think the would know how to rig boats! Gary
 
Gary,
My 22 has twin 40HP Hondas, but I believe the 40 and 50 are identical size. My engines are mounted 3/4" high( bracket above the tramsom). This seems to give me good performance without any ventilation in turns. As I understand it, you normally mount an outboard as high as possible without causing ventilation. The less lower unit in the water, the less drag and the more efficient. Of course determining this is by trial and error/ judgement usually worked out in advance by an experienced dealer. In your case I would have thought if you are getting ventilation you would see an increase in RPM?
 
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