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April 22, 2026
/Columns/The Boat Doctor

The Boat Doctor

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Columns

Hull design dictates propeller type

December 2, 2009 Hank Johnston

The design of your boat’s bottom will affect the type of propeller you will need. In the simplest of terms, there are two hull designs: displacement and planing.[…]

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Columns

Pitch, slip and cup vital terms for props

October 23, 2009 Hank Johnston

Last month’s column just barely scratched the surface as it pertains to propeller technology. In order to better understand propeller designs and their applications it will be necessary to understand the language of propellers.[…]

Columns

Select best prop for your needs

September 30, 2009 Hank Johnston

I have been in the boat business for many years. I know and appreciate the technological advances that have occurred in that time, but I do occasionally find myself reminiscing about the simple good-old days.[…]

Columns

Is it cavitation or ventilation?

September 1, 2009 Hank Johnston

In a recent e-mail, a reader requested help with what he believes is a cavitation problem. He described his boat as a 1994 16-foot center console with a 1994-model 70-horsepower engine.[…]

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Fishing

Give your boat a makeover

August 4, 2009 Hank Johnston

In today’s uncertain economic climate, many boat manufacturers and dealers are reporting lower-than-normal new boat sales. I believe I have discovered a new trend. I call it the boat makeover.[…]

Fishing

The Boat Doctor provides valuable information about use of ethanol in boats

June 29, 2009 Hank Johnston

I look forward each month to receiving my issue of Soundings Trade Only Magazine. This magazine is full of information and news for and about the marine industry.[…]

Fishing

Avoid pitfalls when rewiring your boat

June 1, 2009 Hank Johnston

Accessory wiring in your boat can be a blessing if it is done correctly or an absolute nightmare if not. Wiring is relatively easy, but there are many pitfalls to avoid in order to have a reliable and safe system.[…]

Fishing

Manuals provide flushing directions

April 30, 2009 Hank Johnston

I have been writing columns for more years than I care to admit. In all those years, I cannot remember a single column that generated as much reader response as the one I wrote about flushing your engines.[…]

Fishing

Flushing will save you big bucks

February 25, 2009 Hank Johnston

I have asked many customers how often they flush out their engines, and the answer is almost always the same. They tell me they flush their engines every time they use them.[…]

Fishing

How do 4-strokes, 2-strokes compare?

February 3, 2009 Hank Johnston

I recently received the following e-mail from a reader: “I have a 22-foot bay boat with a 200-hp motor on it. The boat is heavy, but does an honest 52 mph. I want to upgrade to a new 225 hp.[…]

Fishing

Don’t forget winter preparations

December 31, 2008 Hank Johnston

As we move into the colder months of the year, you may be questioning whether or not you should winterize your boat. In Louisiana, our winters tend to be mild compared to our neighbors in the northern half of the country.[…]

Fishing

Boating gifts keep on giving

December 2, 2008 Hank Johnston

Christmas is just around the corner, and you are probably busy trying to figure out what gifts to get for your many friends and loved ones on your list.[…]

Fishing

Don’t forget the basics of ownership

October 23, 2008 Hank Johnston

I don’t think I will ever forget one day when my dad and I were working behind the parts counter at our dealership, Big M Marine. […]

Fishing

You can salvage your submerged boat

September 23, 2008 Hank Johnston

It was just a little over three years ago when Louisiana was dealt a horrific one-two blow from Katrina and Rita. […]

Fishing

Time for duck hunters’ wake-up call

August 30, 2008 Hank Johnston

Each year when duck season closes in January, most hunters simply park their mud boats and forget about them. We usually have other things such as fishing, cruising and water skiing on our minds.[…]

Fishing

Easy ways to save fortune in fuel

June 25, 2008 Hank Johnston

With gasoline prices soaring to all-time highs every other day, I am getting questions about how to stretch the fuel mileage of my customers’ boats.[…]

Posts pagination

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