Reinforced transom

Outboard designs up to 14'

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Reinforced transom

Postby jno3441 » Wed Sep 21, 2016 4:44 pm

I recently read about a build of a zip. The guy reinforced the transom to accept a 25 horse. I was wondering if there is any certain way to do this.

I understand this may not be something that is commonly done or even recommended. I am merely curious about it as the zip will probably be my first build.

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Re: Reinforced transom

Postby joshuab » Wed Sep 21, 2016 7:43 pm

I am currently building a ZIP, it is rated up to 40hp with the transom as originally designed without any modifications, my plan is to run a 40hp, not sure where the "25hp" numbers came from but most zip builders are running 30+hp hope this helps.
I cut twice and it's still too short :mrgreen:

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Re: Reinforced transom

Postby Roberta » Thu Sep 22, 2016 5:01 am

Installing the motor well will give the transom extra support. Also added two extra mini knees on battens outside the keel and some diagonal bracing. I ran a 50 hp Merc on my Zip. Also, use a transom saver brace when towing to relieve strain on the transom. Here are some pics of the motor well and bracing.

Bumpers 004.JPG
Motorwell 012.JPG
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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Re: Reinforced transom

Postby Moeregaard » Thu Sep 22, 2016 5:51 am

We've been running a 40-horse Mercury Mk 55 (~125 lbs.)on our Zip for eight years now. The transom and surrounding areas were built to the plans and we've had no problems. Adding a motorwell and surrounding deck obviously adds strength by "closing the box," but it's adequate as designed unless you're running a larger and heavier motor. As Roberta says, make sure you use a transom saver when the boat is trailered.

-Mark Shipley
A boat is just a wooden box with no right angles.

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Re: Reinforced transom

Postby Hercdrvr » Sun Sep 25, 2016 8:27 am

Transom by design + motor well+ decking= plenty strong.
Mr. G L Witt knew what he was doing

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