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Old 30 October 2001, 12:43   #1
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Deep versus medium V

I am aware of the argument which states that Deep-V will give a softer ride in lumpy conditions but requires rather more power to attain a given speed in comparison to a medium-v hull. What I have not been able to nail down is what is the generally accepted deadrise angle where medium stops and deep starts?

Secondly are there any owners of medium-v hulls who can advocate for or against them on practical experience?

Being mean (or rather having to consider things like fuel consumption as we expect to spend a lot of time afloat in the new rib) I would like to try and work out the shallowest deadrise angle that will still give a good ride on the lumps. Your opinions would be much appreciated.
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Old 30 October 2001, 13:49   #2
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Something around 20 degrees would be the "cross-over". It might be better to think of various known models of ribs, and what they perform like, as you are unlikely to be able to buy a rib with a specific angle unless you make it yourself. A typical "moderate" deep vee would be 23 degrees and give a good balance between soft ride and power. The angle is normally quoted at the transom, and it is equally important to consider what the angle is further forward and how it changes towards the transom.
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Old 31 October 2001, 16:18   #3
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Thanks Alan, point taken, I had not intended to seek a specific deadrise angle, but knowing the "crossover" point at least is a starting point for comparisons when looking at various models.

I have seen a boat that looks as if it may do the job but the manufacturers info described it as a medium-V, now I have a reference point to see how "medium" it is!
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