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Old 03-10-2012, 08:26 AM   #11
Kyle 1974
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so to a regular schmoe like me.... what does the stepped hull do?
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Old 03-10-2012, 08:51 AM   #12
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Edit....meaning can you explain in basic terms the interaction between the hull and water.
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Old 03-10-2012, 09:47 AM   #13
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The step introduces air bubbles to disrupt friction (tension) between the water and the hull giving it more slip in turn allowing it to go faster with all other things being equal (motor, prop, weight, etc). Ever notice your boat will run a little better/faster in a slight chop as opposed to glassy conditions? Did you feel the boat speed up a bit when crossing a slight wake? Same thing...
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Old 03-10-2012, 09:52 AM   #14
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Ah, ok. Does that step way out front do anything? I would think running up on plane, that's well out of the water.
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Old 03-10-2012, 10:03 AM   #15
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Air pocket - think along the lines of a ram air system you see on high speed racing cats. On these setups compressed air helps lift and lighten the boat so the faster it goes. Also makes for a softer ride at higher speeds over rough conditions (within reason).

This Recon appears to have a smaller air pocket than some of the others with larger sponsons allowing it to run shallower at lower speeds (more hull displacement). Eric would the one answer as to just what he's looking to achieve on the sizes of each. I'm guessing a stable platform at rest with shallow draft at rest with most of the benefits of his higher speed cats using the air pocket, even if it is smaller.

Guessing this boat could see close to the mid-70's with a 300 on it.

Don't confuse SCB hulls with normal cats. Most cats do not have a ram air setup nor do they get the associated benefits like the SCB's.

Also, don't confuse these with tunnel hulls that start amidship... Tunnels will normally suck the boat down to ensure water is fed to the prop. This limits top end speed and surely you have seen the posts of people trying to gain a little speed on a tunnel hull that they feel should be going faster. The tunnel is the speed killer... Sure it will run a bit shallower, but speed is the sacrifice. The sucking down effect of the tunnel also makes for a rougher ride and pounding. Don't miss my tunnel at all for that reason!
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Last edited by ReelWork; 03-10-2012 at 10:13 AM.
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Old 03-10-2012, 10:20 AM   #16
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Moreover...

I would suggest the steps and notches are intended to vent the full tunnel and not necessarily introduce air bubbles. The air bubbles in fact are a nuisance and become aerated water at the transom, which the designer aims to avoid as it limits prop "grab" and causes cavitation at varying levels. The ultimate goal is to reduce the suction effects on the hull created by the vacuum properties of a hull that sucks water upwards, and thus, the hull down to the water.

Search Venturi Effect to get more detail on what I believe Eric is trying to achieve with this design.

As for the air pocket, search Albert Hickman and sea sled to get detail from the original designer of the last century who introduced the idea of running on an air pocket.
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Old 03-14-2012, 04:35 PM   #17
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What is the length of the recon? Any more pictures
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Old 03-14-2012, 05:41 PM   #18
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Originally Posted by stxhunter23 View Post
What is the length of the recon? Any more pictures
LOA: 23'8"
Beam: 99"
Draft: ~9"
Weight: 1600# (est)
HP Rating: Unlimited
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Old 03-14-2012, 06:23 PM   #19
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Can you clarify for us ? You have a 25' Stingray and a 23/24 Recon...right ?
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Old 03-14-2012, 08:22 PM   #20
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Originally Posted by Capt Scott Reeh View Post
Can you clarify for us ? You have a 25' Stingray and a 23/24 Recon...right ?
That is correct.
25' Stingray
23'8" Recon
22'6" Stingray
21'10" F-22
21'10" Topcat
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