DRIVE BLUEPRINTING

The primary goal of blueprinting lower units is to perfect the surface that the water is encountering before it gets to the propeller. Luckily for you, we have spent the last 35 years researching and developing drives. Working with the best teams in Offshore powerboat racing for the last two decades has been essential to discovering what can be done to stabilize and improve performance at high speeds in smooth and choppy waters, and our experience in this field has put us far ahead in the class of blueprinting.

The poker run scene holds the majority of our market, where we have blueprinted drives for the fastest Poker Run boats out there. In fact at LOTO 2010 our drives were on the top ten fastest boats with Stern Drives.

It’s true that people underestimate how much speed and stability they’re losing when the drive is not shaped properly and instead of looking at their lowers go to great lengths to customize their engine.

 

skeg 3      Problematic Lowers      skeg 1

 

Imperfections or deviations in the surface of the skeg create small pockets of air that create“blow-out” holes. The propellers seek out the reduced resistance that these small air pockets create, start to hunt for the holes. Ultimately improving the water flow to the propellers can improve all aspects of a boat’s performance. If you have to rev your engines like the clappers to get on plane, it could be because your drives are flawed and clean water isn’t getting to the props. Once you’re on plane, having clean flow to the propellers means they grip better, giving them better forward bite.

Wilson Custom Marine customizes the lower unit to make it more hydro-dynamically efficient, by sharpening the bullet, thinning and changing the sweep of the skeg, all in order to feed purer water to the propeller. Having the lower units fine tuned relieves strain on the whole drive, the engine and even loads distributed on the boat’s transom. The finished result means that the more stability our drives give you allows for an increase in your speed through the water.

Many lower units also come to us with skegs off-center or twisted, creating unwanted toe-in or toe-out that their boat isn’t set up for. Handling issues such as pulling to one side or chine-walking or worse at speeds exceeding 100 mph can be dangerous, and the racing experience of our team look to banish this risk whilst creating a fast yet stable ride.

Usually, boats that need over-revving have their drives or outboards mounted too high because this is the only approach that many riggers and manufacturers know to use when tuning for top speed. However having the props so high reduces the amount of bite the blades are getting so the driver has to try to make up for the loss of grip by applying excessive power. Having less skeg in the water also negatively impacts handling.

 

That’s where we come in!

 

Whatever the reason for bringing your boat to us,  without ever touching the engines, the crew here at Wilson Custom Marine will improve top speeds, acceleration and handling on every boat we receive through our doors.

 

Contact us on 772-287-8755 for your customized quote.