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Old 27 October 2009, 07:28   #11
Country: UK - Scotland
Town: Ardfern
Boat name: Moon Raker
Make: Humber Destroyer
Length: 5m +
Engine: Honda BF 90 D
MMSI: 235035994
Join Date: May 2006
Posts: 694
Originally Posted by two stroke mick View Post
I adjusted the trim tab (on the cav plate behine the prop) the steering is no relativy light when fully trimmed in. In a choppy seas the engine fully trimmed in makes the rib much more comfortable to use. As a result I now can travell at higher speeds with comfort in choppy seas.

That's really interesting. I wonder why the trim tab has made such a difference?

I may give that a try next season as I can trim the engine in until I can't steer at all. . There are times when I would like to trim in more than I do to keep the bow down, but my limit is the steering effort required.

This phenomenon is actually mentioned in my engine owners manual. In fact, having just re-read it..... "Trimming In or Down Can: Increase steering torque or pull to the right (with normal RH prop).".... I've probably answered my own question.

I have mechanical 'No Feed Back' steering, so it's not obvious that there is an excessive pull in one direction - the steering just gets very stiff when trying to turn either way, presumably because the NFB clutches are working overtime.

So, two stroke mick, while standing behind the boat and looking forward, which way did you turn the trim tab - clockwise or anticlockwise? And by how much roughly? (I've tried, I've had it explained, but I just can't get my head round engine trim tabs )

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