What floats your boat.

There is more info on the boat you have taken as example here: http://dngoodchild.com/5246.htm

I am attaching a pdf of the GA plan of the boat, scaled to match the 16.5 ft LOA. In that drawing you can notice the following:
- the draft of the boat is approx. 150 mm
- the transom immersion is approx. 90 mm
- the LWL is approx. 4000 mm.
- the measured the immersed volume corresponds to 950 kg design weight
- the measured LCB is at 1980 mm from the transom.

Apart the LCB too far fwd and the general hull shape, which raise several doubts about that design, the above numbers are pretty much in line with the C-Dory 16' Cruiser boat (http://www.c-dory.com/boats/classic/cruiser-16/16' Cruiser.pdf), which again is pretty much in line with other similar boats on the market (C-Dory 16' chosen just as an example). So I don't think you can get much better draft than that, once the boat is equipped. Unless you opt for exotic composites and reduce all the weights to a bare minimum.

Regarding the flat vs V bottom, your "client" has two conflicting requirements there:
1) he wants a draft smaller than that of a flat-bottom Lily Pad
2) he doesn't want a flat bottom.
The only way you can satisfy these requirements is to take a V-bottomed boat and attach it to a big baloon flying above it, and to lift the hull up this way.
Any other solution will result in a draft bigger than that of a flat-bottom hull.

Nobody can make a recommendation for the hull shape with such conflicting requirements. You need to sort it out with your client first.

 

I can never get that right.
I thought I might have learned something here to the tune of "an affect (n) causes an effect (v).
So then I looked them up and both words are both a noun and a verb...
http://dictionary.reference.com/browse/effect?s=t
http://dictionary.reference.com/browse/affect?s=t
So, I am still confused. I am inclined go with affect as a noun and effect as a verb, although that seems to go with how Tom used it, and your objection because of it. So, I guess I am still confused and might just avoid using the word at all, as much as possible.

Something that burns my toast is the misuse of 'a' and 'an'. It seems to me I usually see that mistake in Tea Party types, so much so that I wonder if it's an identifying trait, ̶a̶n̶ ̶a̶f̶f̶e̶c̶t̶ ̶o̶f̶ brought about by the way a brain is arranged.

 

Chopped liver am I!
Post #160. I would add 'a long very shallow V' and no rocker.

 

This is new, What about different fuels?

And what is this 'product'?

The gas catching pan under the carburetor?

You said in post #6

and now you're talking

. ??

Perhaps you should start over or redefine the Statements Of Requirement, SOR, so everyone is talking on the same page.

 

I had missed the "built of wood" part.
Avoid the wood if your intention is to make a boat for a production line, or else you will have a hard time finding buyers (apart this current client you mention so often).

 

w

I found my boat design fulfilled all of my requirements and more whoever, I am now asked to produce a design to a customer requirements as in post #6 with improvements in consultation with the customer to produce a design for a range of boats for World sales with advantages displayed in my personal boat, such as the no external keel with a metal rub strip and shallow draft
The customer has reasons for the metal rub strip.
As in #post 6 there are requirements which go beyond just the boat bottom
and the need for sales appeal for a World market.

Are you recommending a v bottom?

 

Aside: I've long experienced the odd chuckle at the thought that advanced scientific and engineering degrees, at least here in the several States, have no additional grammar and literature requirements.

And it really can show in those theses, can't it?

Another engineer.

 

You probably missed the mention of " prototype" too.
No wood (except for comfort fittings where needed) in range of production models but new lighter stronger long lasting recyclable materials.

I have to be careful in my market research that I do not give away commercially sensitive information or I will be in strife.

 

Apart from engineers another trait I come up against is finding a competent person in applicable Maths.
Discussions can be a laugh a minute.

 

You have been reading my posts haven`t you and perhaps being sarkie..We have not yet got many recommendation for the shape of the bottom.Just think about what is ahead.

 

The customer has said no flat bottom so that is out. In previous post.
He has many reasons. He is tracking this thread.
Also said we need a boat that has as good or better possible draft as the boat in the image and built of wood.There must be a compromise and still fill customer requirements.

The balloon suggestion sounds good if filled with helium not really wacky.

 

The laughs keep coming here, the customer needs a cup of tea and a good lie-down imo !

 

I have not made decisions regarding the information given on this thread (neither has my customer) and I am not disagreeing with what is in this thread or on teachengineering.org. as some have. Some disagree with what is being put forward.

 

I gave this thread up after 4 posts, some time ago and find it amazing the fishing expedition for an SOR, that can only be defined by the commissioner and designer, continues through this many, mostly unproductive posts.

Designing by committee, has never been a good way to get anything done to a specific person's desires, nor does it help promote a well defined expression of the SOR's goals. If this is real, which I find doubtful, using a teeth pulling method to develop the various aspects of this compilation of convolutions, seems well, a waste of resources.

If this is an actual commission, dear commissioner, get a real designer or NA to develop up this design, as clearly you've been fed a line of BS about what could be done, by whomever. You'll get there much quicker, much more precisely, with defined SOR goals established and an end result that achieves them, which is the whole point behind a custom designed anything.

 

Yep. Go for it.