10 M triple step monohull powerboat

[Adam Younger]

We have designed a very advanced triple step 10m (33') monohull for a foreign client. However it would now appear they are not in a position to go into production.

As a design office we have put so much work inot this and really want to see it go into production. As much of the design has been completed - full hull design and 3D CAD modelled for production etc etc - we can offer a very much subsidised design package.

The design has all our latest features and gives the opportunity of a very fast leisure hull that could also be raced or used as a fast patrol boat hull.

Any builders interested - please pm me / e-mail for more information.

Thanks
Adam

[Adam Younger]

Still hoping to do something with this design - in meantime we have been looking at a centre console version for one builder - but again it appears that current economics in that country are not helping!

Image of hull attached

[Ad Hoc]

good luck adam.
Makes a pleasant change from those days in the porta-cabin at whitegates!!!

[Adam Younger]

Those were the days....

Mind Japan seems a pretty big change!

[Ad Hoc]

yes it is...wife thing!!
I was on IoW for a few weeks in early Nov..was weird being back. Was supposed to go and see old RayT, but ran out of time...since he and a group of us met up for dinner..he didnt show....usual lame excuse.

Hope you're well...

By the way...know who I am yet?? ;)

[Adam Younger]

No - trying to work it out - but might need some clues - or just tell me!

[Ad Hoc]

does JK give it away???

[Eddy Johansen]

Hi Adam,

Have you tried any prototype hull and how does it handle?

All the best,
e

[Adam Younger]

does JK give it away???

Yesa - got it now - will PM you!

[Adam Younger]

Hi Adam,

Have you tried any prototype hull and how does it handle?

All the best,
e

Not as such - but many elements of the design have used or developed from other craft that I have designed and have been successfully launched / tested etc.

So, although it is an all new design and has some new features I'm happy that all factors of the design are backed up with proven examples. Step wise I could list many hulls that have led to this craft - certainly those that I did for Technohull are relevant. The third step does alter things - but we will soon have another (smaller) three step design on the water. Other features such as the double chine effect and spray rails, sections are logical progressions from my other work / craft. Always looking to create excellent handling craft and would be evry happy that this design would continue that.

[Eddy Johansen]

Thanks for answering my question Adam.

So there is actually no guarantee that it will not have any handling problems, nor any realistic top speed prediction, maximum turning speed within CE rules or even maximum hp rating?

All the best,
e

[Ad Hoc]

...are there ever any guarantees in design/life???

[Eddy Johansen]

...are there ever any guarantees in design/life???

Jepp. I think I can guarantee we will all eventually die someday.

As far as design regards: when I design something new the process is more or less like this:

1. Basic drawing
2. Making of testhull
3. Dynamic testing with different sea states and motors
4. Modifications and new testing
5. More modifications and new testing
6. Finishing of plugg and making of complete design project for building and certification porposes.

I realise it is possible to predict speed and handling with a displacement boat and even a non stepped planing hull.

But with a stepped hull you really never know. Please do *not* tell me you can simply scale up or down an existing hull - that is not possible with a stepped construction, neither does it exists any CAD program capable of realistic stepped hull performance prediction.

Have fun - that's why we are making boats anyway, right?

[Adam Younger]

Thanks for answering my question Adam.

So there is actually no guarantee that it will not have any handling problems, nor any realistic top speed prediction, maximum turning speed within CE rules or even maximum hp rating?

All the best,
e

I would disagree with you - I have designed enough boats and have enough data etc to guarantee that there will not be any handling problems. With reagrds to speed / power / weights then for sure they are estimates - but my track record shows my figures to be pretty accurate and mostly improved in actual build.

So this design comes with a lot of technical back-up

[Adam Younger]

Jepp. I think I can guarantee we will all eventually die someday.

As far as design regards: when I design something new the process is more or less like this:

1. Basic drawing
2. Making of testhull
3. Dynamic testing with different sea states and motors
4. Modifications and new testing
5. More modifications and new testing
6. Finishing of plugg and making of complete design project for building and certification porposes.

I realise it is possible to predict speed and handling with a displacement boat and even a non stepped planing hull.

But with a stepped hull you really never know. Please do *not* tell me you can simply scale up or down an existing hull - that is not possible with a stepped construction, neither does it exists any CAD program capable of realistic stepped hull performance prediction.

Have fun - that's why we are making boats anyway, right?

All very well - but this is a pretty rigid approach - I find my clients prefer different approaches depending on many factors. These can vary from type of craft, their experience in building, budget etc etc. As a independent design office we work with our customers to give the best design service - that assures they get the craft they want and we are proud to be associated with the craft they produce.

I never scale up / down for speed predictions. Sure I use factors - but I have formulas that I have developed and my figures are good. So using my database I can give reasonably accurate data.

If the opportunity to hydro / aero test is there then great - but most clients on small craft do not want to take this route.

So I would say the level of testing required very much depends on the level of risk you are atking with the design. For my company we do not look of our step design as necessarily high risk. There maybe other features we would like to look at - and at times we develop prototype / one off race boats and to develop these concepts - but this is not what the design I started this thread is about.

With regards to this design - yes it come with a very acceptable and proven background. I can give very good assurances of it's handling and it comes with a detailed design apckage including speed/ power / weight calculations.

[Eddy Johansen]

Adam, I must then only recognize you must be the best and most experienced stepped hull designer in the world and noone comes even close to you.

So when Fountain says they spends a couple of millions developing one of their hulls and get the steps right, they could for sure save a lot just asking you how to get it right.

Or if we stay on this side of the pond and go a little north to my ol'country Norway, it is rather amazing why Goldfish worked more than a year on one of their latest developments and still ended up making new plugs and molds, delaying deliveries of several sold boats with almost one year. After making several sucessfull stepped hull designs and testing this particular model for litteraly houndreds of hours, he came out publicly and said he had to start (almost) all over again, because some "funny stuff happended in the right circumstances". Which in my opinion was the correct thing to do.

I am quite sure your designs as pretty good, so please do not get angry with me or something. I just reckon we should all be realistic about it.

NASA have spend many, many millions since 1930 or so (of course there was no NASA in 1930:D , but their forerunners existed) to find the "ideal" step and some formulas on how to scale up and down. The main use for steps at that time was on seaplanes - to get them to let go of the water with as little power and as much weight as possible. It is evident that they did several findings and gained knowledge on how to make "more or less" the next model.

But there are no formulas, tricks or hokus pokus abracadabra to get it 100% right without testing. That was the conclussion NASA came to. Test it.

Basically you need 4 things to get a stepped hull right:

1. A little brain
2. Testing
3. Testing
4. Testing

If you want more examples on well known brands with lots of high performance experience, world speed records and offshore race wins that did not manage to make stepped hulls working, just let me know.

Keep up the good work!

[Ad Hoc]

For my tuppence penny worth...when one is on the edge of performance and/or design parameters, using known existing data counts for a lot, even more than on conventional boats. Everything we do as naval architects is based upon previous designs, not just paper ones, but real ones, made and tested and data gathered.

It is usually the "whole design" that is needed, not just once aspect.

I'm no stepped hull designer (just "normal" high speed), but having a vessel complete and tested and then alter the weight distribution or the weight or the drive line etc all influence the vessels performance. If the hulls remains the same, it does not guarantee the same performance, other factors come into play. These other factors all come into play for different reaosns and with differing affects. Hence the more "real" data one has one knows what really does effect performance and what does not, stepped or otherwise.

[Adam Younger]

Eddy - I'm not quite sure of your motives - I have read back through my comments on this thread and happy that I have not made any outrageous claims, comparisons to other peoples work / craft etc.

Yes - I believe very much in my work and feel passionately about it, so will of course defend my work. But I do not make un-just claims of my work or comment on other peoples work.

I agree with you in many ways with regards to testing - but the truth is that it is a luxury that many boat-builders cannnot afford or certainly not to the extent you describe above. As such we do as much testing as is allowed - and I feel as a design office we carry out a fair degree of test and development work through our own prototype / raceboats etc.