Want to do trim tabs for Scarab 22
 

Hi all, I would like that someone will help me cause I am stuck wheather I do trim tabs or not. I have this scarab 22 with an upgraded 502mpi in it, now my problem is when I'm running 70 + the boat tend to chine walk :( Now I was told to do trim tabs, yes ok which size?? 17" or 24"?? Do they solve the problem or not?? I only want them to for stability at WOT. Now, another friend told me not to them cause they drag and you loose mph, is this right?? :mad:

Please help

Re: Want to do trim tabs for Scarab 22
 

YOU WILL LOOSE SOME SPEED BUT GAIN STABILITY.
DO YOU HAVE FULL HYDRAULIC STEERING?

Re: Want to do trim tabs for Scarab 22
 

I agree...
FHS made a difference in my tug.

While on the trailer, if you can grab your outdrive and move it side to side (port-stern) then you may have a stability issue that should be addresed before going to the tabs. Just a little bit of slop will cause tracking problems at the speeds you are running.



btw, imo the 17" would be sufficient on a 22' speedboat.

Re: Want to do trim tabs for Scarab 22
 

Thanks Guys, So I had dual ram add on steering and now i moved to a full hydraulic Mayfair steering, Didn't yet give it a run yet with the FHS. So should I give it a run and see how it goes?? As regarding the drive there was no movement cause I had just put in a new center pin and overhauled it with new O rings gaskets etc.

Re: Want to do trim tabs for Scarab 22
 

If your boat chinewalks,the things that will help correct it are usually as follows: twin ram full hyd steering,getting rid of ALL play in outdrive (loose gibal pins/pivot pins),if that doesn't help ,and it sounds like you have already done this,then you may need to make sure hull is uniform in shape/angle on each side of your pad and vee. As a last resort mounting a set of trim rabs PARALELL to the water,not boat hull will help. My 272 baja with mini pad chinewalked between 70-75 after you were no longer acellerating,even with twin ram external,going full to the helm eliminated 95% of it so I think you probably fixed it with what you just did,Smitty

Re: Want to do trim tabs for Scarab 22
 

Is it difficult to control the chine walking using steering input ? I have had fast speedboats with big outboards that chinewalked a lot and I could always control them by steering in the opposite direction. You simply learn to keep the balance by use of the steering wheel. I think it is great fun to control chine walking, the Formula that I have now is boring in that respect.

Re: Want to do trim tabs for Scarab 22
 

Ok Thanks, So the ideal thing that I will give a run with full hydraulic steering, and see how it goes.

Thanks to all