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Old 08 March 2013, 05:24   #1
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Airhull

Hello RIB fans!!

Have you seen the Airhull RIB with the innovative 2-step, dimpled hull?



Check out this beautiful boat, the Airhull 25 S, which is high rated from the greek magazines for its incredible performance, top construction quality, unbelievable performance in high seas and low fuel consumption, due to the use of Dimpled Hull Technology.

.: AirHull :.
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Old 08 March 2013, 05:34   #2
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Think it would be very interesting to see how this hull would be performing without the dimples. Are there dimples on the planning pad just before transom?
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Old 08 March 2013, 05:39   #3
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In this photo you can see the dimpled hull area.

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Old 08 March 2013, 05:51   #4
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In this photo you can see the dimpled hull area.
As per the golf ball concept....interesting
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Old 08 March 2013, 06:35   #5
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Att high speed those parts of the hull in the water, are those not having dimples....exept maybe a small area before the first step. On the other hand, with well designed spray rails
most of the whisker spray is not touching the dimpled area so how much are their impact anyway?

I know its not that simple, and it is positive that new innovations are made but really would like to understand why this is working, if it is.
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Old 08 March 2013, 10:07   #6
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Looks as though they will provide nice footholds for algae etc?
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Old 08 March 2013, 11:31   #7
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Idea is clever, but isn't the bit that's going to be in the water when it's planing all smooth - so am I either missing something or do the dimples only work in displacement mode?

Scaling the idea down I do remember that the last thing you wanted to do was polish an optimist dinghy. Sanding it with somethiong like 800 or 1200 grade wet'n'dry gave you a tad more speed through the water, so the concept isnlt as crazy as it sounds......
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Old 08 March 2013, 12:25   #8
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Att high speed those parts of the hull in the water, are those not having dimples....exept maybe a small area before the first step. On the other hand, with well designed spray rails
most of the whisker spray is not touching the dimpled area so how much are their impact anyway?

I know its not that simple, and it is positive that new innovations are made but really would like to understand why this is working, if it is.
I've made a trip on this boat and the way that the boat responds when travelling in heavy seas, is really outstanding. It seems that the dimples provide this smoother ride, compared to other similar boats.

Keep in mind that in heavy seas the wetted surface of the hull becomes much larger when you hit the waves, compared to the water surface when travelling in calm-flat water sea.

The tests in the magazines confirm the exceptional performance of the boat and the low fuel consumption.
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Old 08 March 2013, 15:16   #9
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Keep in mind that in heavy seas the wetted surface of the hull becomes much larger when you hit the waves, compared to the water surface when travelling in calm-flat water sea.
This one I buy. Already the steps improve the drag, but If the dimples further improves it, that is an achievement. This boat seams to have the spray rails in same position after each step, often the position changes after each step on stepped hulls.

Its a very interesting science, just read a test of a Beneteau Baracuda 9 with "air step", this test team was not that impressed about the "air" feature and its benefits.
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Old 09 March 2013, 05:25   #10
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This is the Airhull 25 Cabin version, which is expected to be launched in a few weeks time.

Real beauty, isn't she?

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