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Ryan P. Ryan P. is offline
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First recorded activity by BoatBanter: Aug 2015
Posts: 114
Default My 1985 Mercury 75

On 5/23/2016 10:05 AM, Keine Krauseschei�e wrote:
On Mon, 23 May 2016 08:33:24 -0500, "Ryan P." wrote:

On 5/17/2016 1:48 PM, Ryan P. wrote:

There was great debate over whether to lower the engine a peg, since
now it sits a little higher when vertical, but with the additional
setback (about 7") and additional down tilt, we figured the water would
be quiet enough to give me good performance. I can always lower it a
notch if I don't like the way it performs this weekend.


And the answer is... I don't like the way it performs. Oh, it gets on
plain super fast, but now I have a HARD pull to the right. I know I
should be able to tilt the motor back up to about vertical, but now at
cruising speed, vertical brings the prop up too high and I get excessive
revving.

Am I right in thinking that the hard pull is because the motor is
tilted in too far? Will lowering the motor a inch (or two) actually
alleviate the problem by letting me tilt out farther?

Thanks!


Here's a link to some info you've probably already looked at.

http://www.thehulltruth.com/boating-...uld-cause.html


Yes, that is one of the first threads I read. I had thought about a
NFB helm when I was replacing it last year, but I'm glad I didn't.
While it stay on tack if I let go of the helm, I think I'd still have
the issue of it being very difficult to turn the wheel to the left.

The best line I got out of that thread was:

"I can't find it right now but Mercury Marine used to have words and
music describing propeller torque. It was crystal clear that when the
motor is trimmed down/in torque will want to make the boat turn to the
right. When the prop shaft is parallel to the surface of the water the
torque (effort to turn right or left) will be the same. When the motor
is trimmed up/out the boat will want to turn to the left.

The procedure is to find the trim setting that provides most efficient
operation. Then adjust the trim tab anode, if necessary, to eliminate
steering torque at that trim position. "