Is it stable enough for a powerboat?

[tom28571]

Originally Posted by magwas

Don't underestimate the power of internet. I have managed to do that with IT security (another interdisciplinary topic which needs deep knowledge of multiple disciplines) with a great success.

Magwas,

People here have tried to help you but you refuse any help that does not conform to your ideas of how things can be properly learned. Your demands that you be spoon fed by those who gained their knowledge in the fields of books, schools, expert advice and experience of both failure and success is arrogant in the extreme.

Your present state of ignorance of the basic physics of boat performance and design is all the proof needed to show that your preferred method of learning is fatally flawed. Fiddling around with Savitsky while ignorant of what a chine flat is is completely absurd. Children should not play with guns.

I never meant to get into this thread and am here only to defend those who have gone beyond reasonable expectations to help an unwilling novice.

Edited to add:

Maybe I have dumped on you pretty hard and should have something constructive to say. To answer your original questions:

Will the boat plane? Yes, this boat can plane but not very well and will take considerable power to do so. It will have a very bow high attitude that will not be satisfactory. This will be the result of the aft bottom shape that is not at all how a planing boat should be built. A study of any basic book on hull shapes and how they affect performance will explain this. Dave Gerr and Ted Brewer have two excellent basic books for this information.

Is it stable? How stable is the question. The answer is, based on the drawing, not very. The slack bilges and extensive superstructure dictates a fairly tender boat.

You may note that I have not referenced any of your numbers in forming these opinions. It was not necessary since the basic performance of the hull form is fairly obvious from the drawings. In the end, they are only opinions but are based on experience with careful observations of many different hull forms.

Good luck with your quest.

[magwas]

Originally Posted by tom28571

Good luck with your quest.

Thank you for your encouragement.
Interestingly, Norman 20 (to which Vazer asked to draw a similar boat) is described in some used boat site as having full displacement underwater hull.

I have started a new thread because this one became too noisy. You can find my next try there. What I have learned about planing hulls so far