Readers ask: What Is The Differance Between 15″ Shaft And 20″shaft On Uotboard Motors?

What length of outboard shaft do I need?

Measure from the top of your transom to the bottom of your keel. If it is from 15″ to 17″ long you’ll need to get a Tohatsu outboard with a “short” shaft. If it is from 20″ to 22″ long you’ll need our “long” shaft outboard.

Do I need long or short shaft outboard?

If your boat has a Transom Height 15″-16″ you will need short shaft and if it is 20″-21″ you will require long shaft engine. Small inflatables and dinghies tend to require ‘short shaft’ engines whilst larger boats usually require long or in some cases special ultra long shaft versions.

Can you run a short shaft outboard on a 20 inch transom?

zike Elite Refuge Member. If you set the motor back far enough without jacking it up, a short shaft will work on a 20″ transom. Never argue with idiots as they will do nothing but bring you down to their level and then beat you with experience.

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How low should my outboard sit in the water?

A boat rigger’s rule of thumb is that the motor can be raised one inch for each eight to 10 inches of distance between the transom and prop. As the prop moves further aft, it’s also likely to be in cleaner, “harder” water, and be more efficient.

How far below the boat should the prop be?

If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches. For a long shaft, I think 20 to 21 inches is correct. Some mornings it just doesn’t seem worth it to gnaw through the leather straps.

What happens if you put a long shaft motor on a short shaft boat?

Aside from losing several inches in draft, using a long shaft motor where a short shaft should be fitted will most noticeably effect your top end speed. You may also notice steering problems and will have a reduction in fuel economy.

Will a bigger prop make my boat faster?

Increasing prop pitch will make the boat go faster (provided the engine has enough power to keep the RPMs in the optimum operating range. If the engine doesn’t have enough power to run a higher pitch prop, performance suffers across the board and you could easily damage your engine.

Can you change the shaft length on an outboard motor?

If you change to a short drive shaft, you’ll need to change the other shaft that runs through the exhaust tunnel, as it will be too long as well — you’ll need to install a new, shorter shift rod.

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How do you increase transom height?

One non-invasive way of raising the transom on an aluminum boat is to create a “lift” — a bracket that fits over the transom — to increase the motor’s height. The completed bracket forms a channel, and the top of the channel holds the top of the outboard bracket a few inches above the transom of the boat.

What is the difference between a long shaft and a short shaft?

Short vs. Generally, short shaft outboards are 15 inches, long shaft outboards are 20 inches, and extra-long outboards are 25 inches. Since the length of the shaft of your outboard is associated with the size boat, smaller engines will generally have shorter shafts.

Can you use a short shaft outboard on a long transom?

For boat owners with a short-shaft outboard on a long-shaft transom, Vance Manufacturing has developed a solution for you. They act in place of a small-engine shaft extension, mitigating the issues that arise when trying to mount to a transom designed for long-shaft engines.

How deep should my prop be in the water?

The shaft length you’ll need to keep the motor head submerged at the appropriate depth is at least 35 inches. If you frequently fish or boat in rough waters, you may even want your motor a little bit deeper.

What happens if outboard is too low?

An outboard that is mounted too low will limit your boat’s optimal operation. You can often tell that an outboard is too low if you are experiencing sluggish speeds, poor handling, excessive spray, porpoising, or even water pushing up into the cowling.

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Can you use a jack plate to lower outboard motor?

You won’t be able to lower the motor with a jack plate. The transom will get in the way of controls.

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