ContinuousWave
Whaler
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ContinuousWave: Whaler Performance
Engine Trim: Anti-Ventilation Plate Position On Plane
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ContinuousWave Whaler Moderated Discussion Areas
ContinuousWave: Whaler Performance
Engine Trim: Anti-Ventilation Plate Position On Plane
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| Author | Topic: Engine Trim: Anti-Ventilation Plate Position On Plane |
| jimh |
posted 01-07-2006 02:59 PM ET (US)  
Below is an image of a high-speed planing hull which shows the position of the anti-ventilation plate of the motor when the boat is on-plane. (The image is a still frame from a motion picture and the resolution is not as high as a still image would normally be.) This view was taken from an aircraft or some other camera platform which was above and behind the boat. It shows quite nicely how the motor mounting height and trim are set. The upper surface of the anti-ventilation plates are above the water flow. There is not a great deal of spray coming off the lower units, and the spray that is created seems to be deflected away to the side. The view also shows the starboard trim tab is lowered. You can see the effect of the trim tab quite clearly in the wake. This view is somewhat hard to come by unless you happen to have access to a helicopter and can chase your boat around with a good camera and photographer aboard the chopper. I think it is a good example of a boat and motor combination that has been nicely trimmed Although a bit hard to see in the image, the twin engines are rigged with a tie bar mounted on the aft side of the cowlings, and the hydraulic steering actuators work in push-pull opposition from the transom aft to the tie bar plate on each motor.
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