Sappelbaum

Bow Steering

20 posts in this topic

I have an troubling issue with my 256ssi. At low speeds, off plain I'm constantly correcting my heading.  Any suggestions?

 

 

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It's called bow wander and very common with single stern drives. Trim tabs can help but you'll just learn to deal with it.

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If you have trim tabs, run them all the way down, this will help.

Mine are over sized for my boat, and I get very little wandering.  Denny.

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Bow wander is normal, you sort of zig zag but ultimately follow a straight course.  My current boat's bravo 1 wanders much worse than my previous Alpha 1 but presume you have a Bravo3.  

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Add in some wind ? It really gets terrible in no wake zones.  I put on a " Whale Fin "  it almost eliminated all the wander.

It has 2 vertical plates hanging down right in the prop thrust path. It straightens the flow to the back.

Sloww speeds NEED REAL keels under the boat. You would think a deep vee hull with all those straight edges running to the stern would really help. Not mine.

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Never heard of a Whale Fin. I have see Whale Tails but they are horizontal and really provide no benefit.

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www.wanderfin.com Affects the wandering at off plane speeds.

On my 186 SSI it also reduced steering effort to almost very light effort.

I like it..

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3 hours ago, cyclops2 said:

www.wanderfin.com Affects the wandering at off plane speeds.

On my 186 SSI it also reduced steering effort to almost very light effort.

I like it..

Where exactly does it mount?

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On the anti cavitation plate above the prop.  Few holes & bolts. Done

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21 minutes ago, cyclops2 said:

On the anti cavitation plate above the prop.  Few holes & bolts. Done

Does it add extra strain on the out drive when under way?  Denny.

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Mine never cracked any thing. But I do tighten things very evenly.

I did put 2 S S flat washers where they were needed to remove spaces between the fin & plate.

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Trim tabs stopped 99.5% of it on my boat. Straight as an arrow now.

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my 256 doesn't wander much as the twin prop drives help alleviate that.  Also trip tabs.  But it's a completely normal thing that is worse with a single prop drive like Alpha 1 or Bravo 1.  If you come on plane and keep the tabs down and the drive down, you will have major bow steer that can be dangerous.  The bow will "plow" and steer the boat. 

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20 hours ago, cyclops2 said:

Mine never cracked any thing. But I do tighten things very evenly.

I did put 2 S S flat washers where they were needed to remove spaces between the fin & plate.

I'm talking about stress on the unit it's self.

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None. The 2 vertical fins are fixed to the horizontal plate. I DO extreme turns at WOT with nutty PWC jumping the wake.

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6 hours ago, cyclops2 said:

None. The 2 vertical fins are fixed to the horizontal plate. I DO extreme turns at WOT with nutty PWC jumping the wake.

Ok,  Thanks.

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On 7/27/2017 at 9:00 PM, brclark82 said:

It's called bow wander and very common with single stern drives. Trim tabs can help but you'll just learn to deal with it.

More so with single prop drives. With the duo props , it takes most of that walk out since the counter rotating.

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