Hunter 23 transom strength

[Bill Leathen]

I have a Hunter 23 currently with a 6 HP mercury. I would like to change this motor to a 9.9 HP motor with an electric start because of my age and the condition of my shoulder. The motor weight will increase from the current 57# up to 109#. I am planning on putting a stronger motor bracket on the back for the heavier motor. My question is, should I also put additional fiberglass in the transom area to handle this added weight? People at my sailing club with O-Day 25's who have the same motor tell me that I do not need to do this. However I am concerned and would like to hear from anyone with experience on this type of change. Thanks,

 

[Crazy Dave Condon]

Bill, I am a good one on this as I was the top dealer for buying and selling the Hunter 23.

First, sailboat transoms are designed for motors no larger than 10 hp. You are going I assume which is a four stroke engine which of course is heavier. Actually, the 8 hp with electric start with 20 or probably 25 inch shaft would be suitable.

you are working with a transverse transom or one sloped toward the cockpit which does not help. You will need to build a block to offset that reverse slop which to attach the new outboard motor bracket to. On the inside of the rear storage locker, I would have a large metal plate for example aluminum or stainless steel which to bolt to which to distribute the load on the transom. As for bolts, use stainless steel. Long bolts are hard to find but look at West Marine in their hardware section or a company called Fastenal which has locations all over the U.S.

As for the block, I would use delrin white plastic so there is no maintenance vs. wood but the cost is substantially more.

As for attaching the electrical to the hull for quick disconnect, I would suggest the trolling motor electrical plug with the female end on the hull and the male end on the line on the motor.

I hope this helps you in your thinking of what to do.