Outboard shaft length

[apshutt]

The transom is 15.5" the leg from bracket to cav plate (lower) 17.5" is this correct?

[Nos4r2]

Yes, your tube bottoms are lower than the bottom of your transom.

[chriswood]

I have exactly the same setup with my Sib and due to cav plate being lower than transom, I get loads of spray. I'm told the cav plate should be level with bottom of transom - how does your boat perform?

[apshutt]

That's why I'm posting 2 up no faster than 6mph on a canal. Oooops max 4mph. 3.1 fr 6hp Evinrude 2 stroke.

[apshutt]

Doesn't go onto the plane but not tried shifting the weight about much besides moving forwards a bit. One cannot mess about on the canal..

[office888]

Wood block to raise it up a tad?

With a SIB, you'll want the engine tilted up a little bit so the bow does not dig.

[apshutt]

I have tilted it 1 notch which makes no difference really and no prop splash. I will try another notch next time.
Thanks for your replies so far

[apshutt]

Max recommended hp is 8 as per plate! .......methinks???????

[chriswood]

I've got a 2 stroke 30hp on a 380 - and it shifts, so no major lack of performance but it does spray. Is the engine you've got powerful enough to get boat and 2 adults on plane? Did you say it was 6hp?

[apshutt]

Yes 6 max recommended is 8hp. I might have to try an 8 on it.

[MrSkill]

I have a nice 8hp for sale ;-)

Not sure how fast but managed to get my Excel Sd330 to plane easily with 2 and 3 up;

http://www.rib.net/forum/f10/mariner...0-a-67361.html

[humberrib1]

Hi Guy's,

There is a simple but very good diagram shown on the "Barrus" Mariner website.

Engine Choice | Barrus

If you copy and paste the images so that the outboard engine is adjacent to the transom you will see how the anti-ventilation plate lines up with the bottom of the transom and advice on the mounting position at the transom head. I have a Mariner 20hp and the instruction manual recommends the anti-ventilation plate is inline with the transom bottom with a maximum tolerance of 2 inches below. I don't seem to be able to paste the image on this site but can e-mail it to any forum member on request. Hope it helps?

Kind regards
Jon B.