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stepped hulls create multiple contact points and stagnation lines, which increases longitudinal and lateral stability, and lift coefficient. This allows for a better balance and effective trim, which reduces the risk of launching bow high, tripping the transom and stuffing. |
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nice steps on the DW360 for more pics ==> https://www.performanceboatcenter.co...=xNewInventory https://farm2.staticflickr.com/1877/...3b77ecdd_k.jpg . |
Heres a question on stepped hulls, i understand all the theory, etc and how its supposed to help. I own a 33 scarab AVS, runs 85 w 500efis, the mpi 502 versions run 76 to 78ish. The boats titled as a 31, if you look at a slightly older 31 or 33 scarab they look identical except the bottom with its agressive steps. So, if it only makes them faster in smooth water, how come the non stepped versions are 6 to 10 mph slower in rough water and smooth water? How come.my boat still runs 84 or 85 in rougher water, how come the non stepped ones DONT go 6 to 10mph FASTER in rougher water. Serious question, thanks, Smitty
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^^ Once upon a time in the early days of the development of the deep V hull it was claimed that they were faster than other hulls in rough water because they were designed to run fast in those conditions without smashing the boat and its occupants to pieces .
Now ignoring that for a minute , if you have 2 nearly identical V bottomed boats in terms of size and power but one is a slower straight V and the other is a faster (by virtue of its bottom) stepped hull then as far as I see it the slower boat will always be slower . It's not suddenly going to pick up 6-10 mph simply because it's rough . Wouldn't the step bottom also pick up the same 6-10mph ? Am I missing something here , or maybe over simplifying ? |
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One other major variable in the comparison is that once you’ve really got air on the hull, your prop may be out of the water. Meaning you aren’t putting all of your power into to the water to achieve max speed. |
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