How To Determine Shaft Length For Trolling Motor

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Can a trolling motor shaft be too long?

However, if the shaft is too long, the propeller creates turbulence deep beneath the boat that will spook any nearby fish. And if the shaft is too short, the prop won’t be adequately submerged, which will create noisy chop in the water and also scare away the fish.

How far should your trolling motor be in the water?

Setting your trolling motor at an appropriate depth will help it to function properly, while at the same time reducing the risk of it becoming damaged. Remember, the general rule is to keep the motor submerged 12 inches below the waterline.

How do you size a Minn Kota trolling motor?

General rule of thumb: you need at least 2 lbs. of thrust for every 100 lbs. of fully-loaded boat weight (people and gear included). If things like wind or current are major factors where you fish, you’ll want a little extra thrust.

How does Minn Kota measure shaft length?

Measure down from the mounting surface of the transom or bow to the water level. Add 5″ to waterline measurement for fishing in rough water. Add 12″ to waterline measurement for steering a hand control motor while standing. Use this measurement and the tables below to find the appropriate trolling motor shaft length.

Can I run my trolling motor out of the water?

Your motor is cooled by the water around it, while running it out of the water for a very short time would be OK, it would take a long time to drain the battery much running the motor out of the water with no load. Why risk damaging a very expensive TM to just drain the battery down.

How is engine shaft length measured?

For electric outboards, the shaft length is measured from the top of the clamp bracket to the center of the propeller. For gas outboards, it’s measured from the top of the clamp bracket to the anti-ventilation plate.

Can you adjust shaft length Minn Kota?

The only motor that the shaft is unable to be shortened on is the Ulterra. The Ulterra shaft is not able to be shortened because of the Auto Stow/Deploy and Trim features. To shorten the shaft of an Ulterra, you would have to replace several parts including the the shaft and the control board.

How do you measure a transom?

Take a straight piece of wood, rod, or tubing the same length as the platform you desire. Mark the center of the straight edge, hold it level and square against the transom with the center marks matched. Measure from the ends of the straight edge to the transom.

How can I speed up my trolling motor?

The safest way to increase the speed of the boat is to duplicate the propulsion system, i.e. add another battery, trolling motor, and whatever else goes with it. That way, you get a higher speed and you still get home if one goes wrong.

How long will a deep cycle battery run a trolling motor?

A marine battery will typically last for around 5 hours when running a trolling motor. However, this can vary depending on the age and condition of the battery, as well as other factors such as the weather.

What size battery do I need for a 55 lb thrust trolling motor?

Using a Newport Vessels 55lb thrust motor continuously for two hours at full speed would require a battery with a 100-120 AH rating.

How far below boat should cavitation plate?

The cavitation plate should be nearly even with or slightly below the bottom. For a short shaft the vertical measurement of the transom should be about 15 inches.

Should cavitation plate be underwater?

your cavitation plate should be right at the water level. As a rule of thumb it should be 1 inch above the hull for every 12 inches back. (if you have a eurotransom, or bracket or something.) If your cavitation plate is under water you might get better performance if you raise the motor.

Do trolling motors need grease?

Lubricating Your Trolling Motor Next time you give your boat a wash, don’t forget to lubricate your trolling motor shaft. This can be done after you have cleaned your trolling motor with water and a mild soap solution and wiped dry.

How do you clean a trolling motor after salt water?

Saltwater can be harmful and damaging to any watercraft, so cleaning the boat itself as well as the trolling motor is vital after exposing it to saltwater. Make sure the saltwater trolling motor is thoroughly washed and rinsed with freshwater until all salt deposits are washed off.

Is it OK to leave trolling motor in the rain?

If you want to protect your trolling motor from substantial water damage, it’s best to keep it away from heavy rain. Trolling motors that suffer water damage can lead to your motor not functioning properly.

How long can you run a boat motor on muffs?

For larger engines, use the flush port or a set of flushing muffs. Water pressure should be set to one-half or more to ensure adequate flow to the intakes. The engine should be run for five to 10 minutes.

Will saltwater ruin a freshwater trolling motor?

Yes. A freshwater trolling motor can be used without immediate damage in saltwater. However, there is increased risk for corrosion on metal components. Apply a thin coat of oil or grease to exposed metal and rinse the trolling motor with freshwater after using it in saltwater.

What size trolling motor do I need for a 18 foot pontoon boat?

For most pontoon boat purposes, you’ll probably want a 60″ (152.4 centimeter) trolling motor shaft.

How big of a motor can you put on a 16 foot boat?

To achieve maximum efficiency, you’ll have to give it 50 to 300 horsepower. There’s a range of the required power as you take into consideration the size and usage. An aluminum boat that is 16 feet long needs to have a 60 horsepower motor. Once equipped, it can have a speed of 25 to 30 miles per hour.

What is the biggest motor you can put on a 20 foot pontoon boat?

For 20′, 21′, and 22′ pontoon boats, you should have at minimum a 90HP motor. For 23′, 24, and 25′ pontoon boats, I don’t recommend going below 150HP. The “all-around” performance can be achieved by a 175HP motor. If you want the best of the best, go for a 200HP motor.

How do you tell if your boat needs a short or long shaft?

To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. If it measures 15″ or with in a inch of that you will need a short shaft outboard. If it measures anywhere from 17″ to around 22″, then your going to want to go with a long shaft motor.

Can I use a long shaft on a short transom?

Re: Longshaft motor on a short transom skiff? It will will *run* fine, but it can cause bad handling. Also trim position settings will have a greater effect. No harm to try it, carefully, and see how it goes.

Can you put a 25 inch motor on a 20 inch transom?

You will get a definite performance drop using a 25″ shaft on a 20″ transom. Engine will be way too low. Options could be too lift the transom by building it up. If that is possible that will also help the low engine issue.

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