Photo by Ron Sinfelt

By Ed Harp

The electric motor is one of the most important pieces of equipment on your boat. And yet, how much do you really know about it? How much time did you spend selecting it? How should it be maintained? How much do you know about your batteries?

The answer to those questions is probably, "not much." The answer should be, "plenty." The reason is obvious. You spend a lot of time with your electric motor. Efficient fishing is darn near impossible without one.

The first and most obvious issue you must address is: How much thrust - power - do I need?

Thrust is a measure of force. It's generally measured in pounds. How much you need depends upon a number of factors. Boat size is one. You need more thrust to pull a big center-console pontoon boat than you do to push a small lightweight canoe.

Keep in mind, however, that boat size is only one factor. Consider where and how you fish. You'll need more thrust if you frequently fish windy lakes or rivers with a moderate to high current. You'll need more thrust if you travel long distances with your electric motor or if you typically fish long days.

And what about weight load in the boat? Do you mostly fish alone or with several buddies? Do you typically carry coolers, ice and livewells filled with water? Those things matter. More weight requires more thrust.

Although not directly related to the motor's thrust, the motor's shaft length is important as well. The shaft must be long enough to keep your prop in the water, even under rough and windy conditions, but not so long as to create unnecessary drag. Most models come equipped with an easy mechanism for adjusting length - use it.

Both major electric motor manufacturers, Motor Guide (www.motorguide.com) and Minn Kota (www.minnkotamotors.com) offer many models with varying thrust capabilities and with varying shaft lengths. Carefully consider what you need and buy just that. Buying less will make you miserable. Buying more will waste money - money you could use to go fishing.

Most experienced anglers and boating experts advise selecting a motor toward the high end of the recommended thrust range for your rig. (Both manufacturers have charts you can consult for their thrust recommendations.) They draw an analogy to your combustion motor. While a smaller motor may seem to be enough at first, the lack of speed and performance will soon begin to show. It will quickly sow the seeds of discontent.

All major manufacturers offer electric motors with voltage ratings from 12 to 36 volts. In theory, the higher the voltage the more efficiently a motor runs. More efficiency means more available power. That may be true in a theoretical sense but not always in the real world. Three batteries add a lot of weight and expense to your rig, especially if it's small.

Once a decision has been made about size and power, you'll need to consider features and options. Electric motors are available with just about every feature imaginable. They include simple things such as air and water temperature gauges on up to depthfinders, sonar units, remote control capabilities, autopilots and GPS navigation systems.

These features are nice, no doubt about that. They are also expensive and require maintenance. If you need them, get them. If you don't need them, don't get them.

Maintenance on the basic motor doesn't amount to much. Depending upon your make and model there may be a few places to oil or grease occasionally, but that's about all. Check your operator's manual for details.

Selecting the right prop is important to the overall performance of your motor. A two-blade prop will give you the most speed but not the most power. A three-blade will combine speed with power and a four-blade will offer the most power. If you frequently travel long distances under electric power go for a two-blade model. If you need power to handle wind and current, consider a four-blade model.

Many props claim to be weedless. Some are and some aren't. Most truly weedless props have relatively short blades. The reason for this is that shorter blades, having a smaller diameter, are easier to turn and harder to stop.

To make your current prop more weedless keep the edges of the blades sharp. This will help them cut through vegetation. You can sharpen them with a file. There are also add-ons that can be affixed to the skag that help.

Nearly all serious anglers keep two or three props in their boat and change them as conditions require. It only takes a minute or two to do this and will make all the difference in the world in how your boat performs.

At least one prop maker, Kipawa Products (www.kipawapropellers.com), advertises their props will increase power, conserve battery life and glide through the heaviest weeds. That seems like a tall order, but the owner, David Gozdinsky Jr., makes a convincing case. Check out the Web site, give him a call, and make your own decision.