Porpoising at idle speeds

your not going fast enough for that to happen at idle??????????? or do you mean the motor rocks back and forth?????????????
 
Porpoising is bow up and down... not left to right.

With an Alpha outdrive, left to right while idling is normal.
 
Single prop and single motor Alpha will do this.
 
Lol yep, slow waddle club I like that! My Sport 190 does the same...
 
The trick is to make very slight corrections when trying to track straight. Also, giving it a little more throttle will help with the waddle.
 
Try trimming the motor up. I found a sweet spot that almost eliminates the waddle for me.
 
This sounds like cavitation. A single engine has the tendency to do this. If you hold course steady does it wander left and right but over a distance track straight?


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That is very common with smaller boats. Its not just the Alpha drives either. All small boats are prone to it. I think it has more to do with hydrodynamics and the waterline to beam ratio and how strakes adn chines are set up to optimize stability at speed and impact slow speed. Its normal. As others have said, once you learn the rythym of your particular boat you will just match and offset the rythym with steering corrections until you get one plane. It makes long no-wake sections a pain in the butt though.
 
Yep, a normal thing.
Our 22 Pachanga with a big block bravo was terrible with the wander. Constant steering at idle speeds.
 
I will try trimming up some.

It waddles left to right, but over a long course, it eventually veers off one way or the other.

It really is not a big deal, but makes pulling into the stall of my dock a little tricky.
 
For my 175, the wander is MUCH worse when I trim up, as it tries to lift more hull out of the water (obviously not much at idle/no wake, but that's the direction of force). Trimmed all the way down gives me the most stable ride, but it still wanders quite a bit.
 
Even my old 270 with a Bravo III would wander but I could get the wheel set to the right direction and just let it wander and still maintain the general course. Let it chime back and fourth... if you fight it, you're just wearing out your steering components.

Not sure this will work for you... just thought I'd throw it out there.
 
JimG said:
Even my old 270 with a Bravo III would wander but I could get the wheel set to the right direction and just let it wander and still maintain the general course. Let it chime back and fourth... if you fight it, you're just wearing out your steering components.

Not sure this will work for you... just thought I'd throw it out there.
Click to expand...

+1:smt038
 
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