Stress on Transom From Jack Plate

Post by **Ron Wilson** » September 10th, 2007, 6:27 pm

General question: Was wondering if the extra distance created between the transom and the motor when a jack plate is installed creates extra stress on the transom? As I look at the motor set back, it would seem like there is potential for added stress. Anyone know, or am I the only one who doesn't know the answer?

Post by **tin can** » September 10th, 2007, 6:34 pm

Most transoms are over built. You don't get nearly the stress from the jack plate as you do from.........oh, hitting a rock at 40 MPH.

Post by **Chalk** » September 10th, 2007, 6:36 pm

You are the only one

It can add a little more stress, but the entire transom is built to a standard and designed to take a certain amount of torque and stress, usually much more than needed.

The jack plate bolts to the same holes as your engine...The jack plate is designed to hold the engine, the transom is designed to hold the engine...It will be fine Devil Dawg

Post by **birddog** » September 10th, 2007, 6:40 pm

I've seen the jack-plate fail but never the transom (without running into something.)

They've broken several jp's on the redfish tours

Post by **Ron Wilson** » September 10th, 2007, 7:03 pm

Was hoping for a coordinated response from The Council, and as usual, not disappointed. Thanks Gents. Glad I went with the jack plate. Ready to try it out now.

Post by **Redbelly** » September 10th, 2007, 7:05 pm

What kind of boat do you have ron Wilson?

Post by **Ron Wilson** » September 10th, 2007, 7:11 pm

Just put the JP on a 1910 NauticStar.

Post by **birddog** » September 10th, 2007, 7:20 pm

How bout a pic Ron.

grim reeler · Post by **grim reeler** » September 10th, 2007, 9:08 pm

To answer your question, yes the jack plate does add extra stress to the transom because of the added distance. Think moment and fulcrum - you know, like a see-saw - the further you are from the pivot point, the less force it takes to move the other end.

But like others have said, most transoms are over built and can take it without any issues.