Auxiliary mount bracket ply backing

Nos4r2 · 16 February 2013, 22:40

I've got one of these (exact model) to hang the Yam 8hp 2 stroke aux for the Ballistic on.

It'll be held on by 8 M8 316 bolts through the transom.

I have a couple of small offcuts of 6mm 'Marine' 3 ply kicking around that are about the right dimensions for a backing pad where it's bolted to the transom.

1) Is 6mm 3 ply going to be enough or do I need to laminate the 2 pads together-or would I be better off using a chunk of the 18mm I have lying around?

2) Is there any real reason anyone can think of to have a ply internal pad as well or will a nice strip of 316 or penny washers be sufficient?

Festinghouse · 17 February 2013, 09:06

youve got a fair amount of weight in that engine and once youve jumped a few waves youll soon see how easily things break. use the 18mm ply, and use 10mm bolts with a spreader plate on the inside of the transom, or at the very least use big mud guard washers. if not you will find that the bolts will want to start pulling into, and then through the transom.
oh and if using 10mm bolts, id only use 4 or 6 instead of 8.

Nos4r2 · 17 February 2013, 12:12

Cheers

To be honest I'm not particularly happy at the prospect of having to fit a bracket at all, but the transom is too thick to put the Yam over.

SPR · 17 February 2013, 12:34

Quote:

Originally Posted by Nos4r2

Cheers

To be honest I'm not particularly happy at the prospect of having to fit a bracket at all, but the transom is too thick to put the Yam over.

I read on here - the mount is least of your worries. The bracket usually goes !

I would get a local company to fabricate one that does not tilt - to your specs/ recommend. not so long etc.

S.

Nos4r2 · 17 February 2013, 12:48

Therein lies the problem-the aux is a short shaft, so the bracket needs to drop.

It's a 20hp rated bracket, with an 8hp 2stroke on it that weighs the same as a 6hp, so hopefully I've avoided the bracket falling apart issues.

Festinghouse · 17 February 2013, 14:22

im about to fit one to mine, just remember not to rely on the catch, and use a strap to secure it tight (poss' around the a frame).

AMac · 17 February 2013, 15:16

hi
from personal experience of nearly loosing ob from same type of bracket i would say to you get rid of this alloy type and buy an all stainless type as they do not corrode like the alloy type

AMac · 17 February 2013, 15:17

also make sure you have a safety strap fitted
it was the only thing that saved my ob from drowning

Nos4r2 · 17 February 2013, 15:19

Quote:

Originally Posted by AMac

hi
from personal experience of nearly loosing ob from same type of bracket i would say to you get rid of this alloy type and buy an all stainless type as they do not corrode like the alloy type

I would have, but couldn't find a stainless one rated to 20hp without spending a fortune. It's food for thought though-cheers.

AMac · 17 February 2013, 15:27

bracket is still cheaper than new ob!!!!!!