Choosing the Correct Boat Propeller

Choosing the Correct Boat Propeller

Is your boat struggling to perform? Do you feel like it’s working hard, but isn’t moving fast enough?

If your boat is struggling, there’s a good chance your propeller is old, outdated, damaged, or wasn’t designed for use with your boat. Choosing the correct boat propeller is one of the most important considerations for your boat.

With the wrong propeller, you can never expect your boat to perform the way you want. And with a damaged propeller, your boat might not work at all.

If you are looking to improve performance, speed, handling, and fuel efficiency, you’ll want to upgrade your boat prop as soon as possible. 

Wondering how to choose the right prop for your boat? Keep reading to learn why it’s so important, as well as how to choose the right one. 

How do Boat Propellers Work?

Propellers sit under or behind your boat, in the water. When the motor is running, fuel burns, causing the rotor to spin. This, in turn, causes the propeller to spin.

The blades on the propeller then push water behind it, causing your boat to move forward. Without a boat prop, there isn’t anything to thrust your boat forward, and you are essentially sitting in an oversized kayak.

Propellers are one of the most important pieces of equipment on board your vessel. But because they are often unseen, many boat owners overlook them.

Why Boat Propellers are So Important

So why exactly is having the correct prop so important? Few other boat parts will dictate performance as much as the propeller.

The right boat prop can help you maximize the power generated from your motor. Having a prop matched to the size of your boat can allow for maximum acceleration, so you can get up to speed quicker.

Plus, having the right-sized prop can give you more control over your boat, letting you handle it with greater ease. 

How to Choose the Correct Boat Propeller

Every boat is different. As a result, every boat would benefit from a different propeller. There is no one-size-fits-all when it comes to boat props.

Even different uses may require different propellers for maximum performance. When water skiing vs. cruising, for example, a different propeller would benefit your boat. Here are the main factors to consider when choosing a new prop.


Most boat props are made from either stainless steel or aluminum. Aluminum is cheaper and lighter. As a result, many boats come stocked with an aluminum propeller.

They still offer great performance but are generally considered lesser than stainless steel. Stainless steel propellers are much stronger and more durable than aluminum. So if you use your boat a lot, or if you use it in questionable waters, stainless steel will last much longer for you. 

In the event your prop hits a rock or other sunken object, steel will withstand damage much more than aluminum. And while steel is heavier, it offers better acceleration, letting you get up to speed faster.

Of course, the benefits of stainless steel come at a cost, as they are much more expensive than aluminum. Solas propellers are available in both steel and aluminum varieties and are among the best and most affordable. 

Size and Pitch

The larger the propeller, the more water it will push with each rotation. This creates more power. Consult a propeller sizing guide to see what the ideal prop diameter is for your boat.

Likewise, the boat prop pitch is the distance that your boat is going to move after a full rotation of the propeller. Therefore, a higher-pitched propeller will let your boat move faster and further. A lower-pitched propeller moves the boat slower.

But it’s not simply a matter of buying the propeller with the most pitch. It’s about matching the diameter and pitch of the prop to the size of your boat and the engine.

When operating your boat, you want the engine to maintain a certain RPM. Check your boat and engine’s manual to determine the optimal RPM range.

A propeller that operates under the recommended RPM range will cause the boat to lag, making the ride less than pleasant. But a propeller causing the boat to strain and revs the engine too high will overwork your engine. 


Most boat props come with three blades. These offer the best balance between power and efficiency. But it’s not uncommon to see props with four or five blades.

More blades often reduce vibration when operating your boat. This offers a smoother and more enjoyable ride. However, you can generally expect less power and efficiency.

Other Prop Factors

There are a number of other factors to consider when choosing a propeller. The rake angle, the degree of cupping, and other factors are also relevant to your boat prop purchase. Research these factors thoroughly before selecting a prop.

Carry a Spare

It’s always a good idea to have a spare boat prop and to keep it stored onboard. If you are far from shore and your prop sustains damage, you may need to replace it while in the water. In these instances, having an emergency boat kit tucked away can also be a lifesaver.

Many suggest storing a prop with a lower pitch onboard. If you ever needed to tow another watercraft, the lower pitch would be more useful. 

Or, if you buy a new prop for your boat, just keep the old one as a spare for emergencies. It might not work great, but if it can get you back to shore, that’s all you really need. 

Find the Right Prop for Your Boat

It can be difficult to find the correct boat propeller for your specific boat. Even after poring over a propeller chart for hours, you may still be left scratching your head.

The best thing you can do is consult an expert. Visit your local boating shop, or consult online forums to get recommendations from people who know what they are talking about.

Looking for other tips like this? Check out the rest of our blog today to keep reading.