This particular boat is a perfect example. It’s a brand new Dale Classic 37 with a semi-displacement hull driven by twin Volvo engines on shafts and rudders. There’s a shallow keel running the length of the hull, which gives it slightly better grip on the water than a full- planing hull, but the tall bow means it’s likely to have a reasonable amount of windage too. The drive system’s power delivery to the water and how to use it can be split roughly into thirds.
Both propellers turn outward in ahead gear and inwards in astern. However the positioning of the propellers, offset to either side of the centre line, gives one third of the turning ability; put port ahead and it will induce a turn to starboard and vice versa, with a pivot point about a third of the way back from the bow. Putting that same port engine in astern will produce a similar turning motion by pulling the stern to starboard but this time with a pivot point closer to the stern. It’s a bit like pulling or pushing on one side of a shopping trolley’s handle.
This story is from the December 2023 edition of Motor Boat & Yachting UK.
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This story is from the December 2023 edition of Motor Boat & Yachting UK.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
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