Marinette Boat Forum

A buddy welding up the second design

I bet no one here has seen a hole that big in the stern of a Marinette before!

Wild!

I hope you're reinforcing the hell out of the transom to take the huge bending loads from those outdrives....

Of course, you are!

Great project!

Jeff

Full transom weld up!

Inside transom welding

Transom assembly cut outs

I made a jig to get the location of the new stringers and engine mounts.

Stringers laid out and a relief cut out for the power steering actuator.

Looking good, but you must install some substantial 'knees' to brace the transom to the keel (and in at least four places). The twisting down force load on the transom from those huge motors is significant!

Example: One of tests I use to determine if an I/O boat's transom is rotted is to stand on the cavitation plate and jump up and down. If any visible flex is seen the transom is on its way out.

Good luck on your fascinating project!

[attachment=0]Marinette Knees.JPG[/attachmenteff

Jeff

I 2nd Jeff's reinforcement suggestion. Marinette hulls do crack. I've seen 2 models that cracked up near the chine and the welder told me he has repaired a handful of Marinettes.