Adding transom knees

[dada73]

So I'm planning to reinforce the new (2 years old) dry and stable transom with additional knees.

Reason is the upgrade from a 180kg Yam 4cyl to a 200kg Yam 6cyl.

The space in the back of my 18foot Driver 560 is just as limited as it is with the Phantom 18.

This made me think of using angled knees like the Phantoms have them.

Here's pictures of the mockup made of xps. (Will use Okume aw100 plywood with west system epoxy though).

What are you opinions?

Would that work? How to deal with the sharp angles? What about the inner knees? Better to have only one centered? What about reinforcing the transom to sidewall joint?

[dada73]

Or would you guys opt for a stainless steel reinforcment like this:

[Ametuer]

I would much rather prefer the foam knees rather than the stainless b******t. Also the last knee on the side i would bond it to the tub aswell for added support