trim tabs needing to be flush?

[driftah]

I have a question about trim tabs...how much does it matter if the tab when at 90 deg. sits level with bottom of hull,as in if the trim tabs were mounted a little high on a transom would this cause any issues.I ask because I have a boat that has tabs mounted up higher and they have to be screwed down far in my opinion to meet the bottom of transom line?

[Make-a-Wake]

Tabs need to be about 3-4mm above the bottom of the transom............never flush.

[marko500]

My SV27 when new had the trim tabs mounted way above the hull bottom. I took them off and elongated the holes with a small round file until the tabs were almost even with the hull bottom. Alot easier and neater then redrilling the transom.

[cpgise]

Mount them about 1/16 to 1/8 inch above the bottom of the hull.

[martin]

If you mount them level with the bottom of the hull they create more drag, as been said mount them up from the bottom.

[T.S.Davis]

Really? I've never mounted my tabs above flush.

[driftah]

ya odd my df29 has them mounted about 1mm above flush and it is a bullet,I notice zero drag but hey its worth a try movin them up a touch maybe.