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Old 10 May 2010, 16:48   #21
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Very interesting So I guess the answer is not to over power.
I am hoping the rib will be quite heavy when loaded .

So would it be better to make another hull with out a planing pad .????
There are other posts on here that suggest ifs and buts or more likely just views of how people found them, but no .. I'd go for it with what youve got and let us know how you get on .. Its gonna be fine, but like Chuck Yaeger breaking the sound barrier .. You'll never really know till the last minute how it performs .. but like I said .. you just add ballast and shift some weight around to prevent it if all else fails .. or dont go into the danger zone with the throttle, if youve put a lot of hp on the back.

Some hull manufactures might offer some comment here, but my concern with a pad of that shape is that if the boat is too light, it will drag to one side very quickly, causing a sharp loss of steerage, which could be a bit nasty and even more violent than just the usual slap onto one side .. I dunno ? just my VHO
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Old 10 May 2010, 17:03   #22
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I'll take it out for the first time for you if you want, sounds like fun!

Ultimately with chine walking you'll get thrown out of the boat, although throttling back or trimming in a bit can reduce it.
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Old 10 May 2010, 18:06   #23
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I have never seen a planing section that large. I am guessing that it will actually help with the high speed performance and moderate the chine walking (depending on load). There's not that much flopping from chine to chine (hence the name) it can do. But that pad will also probably degrade the rough water performance a little bit and create some "slam". This will again depend on weight and the lift you are getting "over" the waves from the tubes vs. how much deadrise you have forward etc.

I would keep it as is for now and plan on powering with a ~115-125hp
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Old 11 May 2010, 00:58   #24
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Thinking i will have to complete it and weight it then consult the forum.
But I do know at the stage it is in now it's quite heavy.

Thanks everybody and Chewy looks like he will be the test pilot.
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Old 11 May 2010, 03:36   #25
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You say you need an 'extra long shaft outboard' but that planing pad has removed lots of rear hull height, and also your transom seems to have an engine cut-out in it.

Surely the prop will be way too low in the water if it is an extra long shaft?

I think you are being very brave designing a hull from scratch with such a radical planing pad. Manufacturers have CAD/CAM, experience and yet they still get it wrong.

good luck.

pvm
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Old 11 May 2010, 03:41   #26
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You say you need an 'extra long shaft outboard' but that planing pad has removed lots of rear hull height, and also your transom seems to have an engine cut-out in it.

Surely the prop will be way too low in the water if it is an extra long shaft?

I think you are being very brave designing a hull from scratch with such a radical planing pad. Manufacturers have CAD/CAM, experience and yet they still get it wrong.

good luck.

pvm
No this is a fletcher converted hull.

Reading through the forum ( transom height ) thread seems that the long shaft is required.

says from the bottom of the keel to the top of the transom 26" to 28"
so I made it 27" high from the bottom of the keel.

I dont know if the pad makes any deliverance on the length of the outboard.Or not.
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Old 11 May 2010, 06:45   #27
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Very interesting So I guess the answer is not to over power.
I am hoping the rib will be quite heavy when loaded .

So would it be better to make another hull with out a planing pad .????
Sonar
I would see how it goes before I started another hull. You could always add to the hull if you wanted to reduce the planing pad latter on.Looks like a nice finish on the hull.
Good luck with the sea trials.
rpm
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Old 11 May 2010, 06:48   #28
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Thanks everybody and Chewy looks like he will be the test pilot.
Happy Days!
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Old 11 May 2010, 06:57   #29
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Happy Days!
What's your insurance like .????
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Old 11 May 2010, 07:38   #30
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What's your insurance like .????
I don't mind swimming back if it sinks...... whats yours like?
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