For additional details pertinent to this video please read the description below.
The Prop is the second video in our Physics of Docking series.
Jeff Merrill and Douglas Cochrane have created this series to share some insights into the various aspects and techniques that trawler owners need to know and can learn to improve docking.
Filming for this video was done in San Diego, CA aboard a single engine Nordhavn 57 and we used the tender outboard motor for some close-up propeller feature discussions. We all know that the propeller drives us forward. In this video, we also show the details of how a propeller rotating underwater (slowly in forward or reverse) will affect the movement of your stern - essential to know when docking.
The SCREW effect of your propeller turning pushes you forward.
PROP WASH is the force of water turbulence created by the propeller that, when going slow in forward before gaining way, can be deflected by your rudder to move your stern in one direction making it easier to turn.
PROP WALK is the “paddle wheeling” effect that moves your boat to one side in reverse. The direction your trawler walks depends on whether you have a left-hand or right-hand propeller.
Propellers are designed to PUSH your trawler efficiently forward.
They behave differently by PULLING your trawler through the water when you shift into reverse.
On a long keel hull underbody shape like our Nordhavn 57, the rudder has much less effect on steering when you are travelling backwards since the propeller wash is directed towards the keel, not deflecting off the rudder.
There is much more to discuss about propellers, like pitch, the number of blades, etc.
With a better understanding of propeller effects, you can go out on your own trawler and experiment to see how your boat handles with some of these techniques. It’s fun to practice some new moves that will improve your close quarter handling and as you gain more confidence you will also have better control.
Docking success requires finesse, patience, and a sound understanding of all the “tools” your trawler has available. Anything you can do to improve your docking skills is time well spent. We recommend you practice different maneuvers away from crowded marinas, in open water, to simulate different situations.
Please keep watching as we have more to share in the PHYSICS OF DOCKING.
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