boats that are designed with car aerodynamic method?

Tunnels, you are the one who keeps wandering around now. Please, try to maintain your concentration.
You asked to see some example of modern-style boats. There they are, in my post #86.
Any comments on their aerodynamics? What would you do differently?

 

nice boats !!

 

So evidently things are generally not the way you said, at least not in my part of the world:

Not all designers (and designs) fit those kinds of drammatic and grim descriptions. When they do, it is done with a purpose.

Guess you have based your opinions on some retro-styled trawlers or runabouts you use to see in marinas around you. Some folks like them that way, you can't discuss about each one's personal taste. Some others have bought old second-hand boats because they cost much less than new and modern ones.

As PAR said, if you want to see how much the boating industry has changed in the last decades, you should go more around boat shows. You could be pleasantly surprised.
This website has some examples of current powerboat designs, check it out: http://worldsportsboats.com/

Cheers

 

water drag is a bit more than air drag so hence thats were the money is spent

 

ok where is your contribution to the question that was first asked , he even said please ??:?:


boats that are designed with car aerodynamic method?
Hido you know any thing about:
boats taht they are designed with car airodynamic method??!!!
please help me

 

My replies were directed to issues you have stubbornly reiterated from the first page on. They can be seen, with all the factual arguments, from the page 3 on. I wrote them based on a wrong conviction that I'm dealing with an intelligent and receptive person on the other side, but so far it turned out to be a vain hope.

The original question was answered in the first 10 replies on the first page, and Dina has acknowledged it to the repliers. Then you chimed in and have drawn all the attention to yourself in the remaining pages. You did it without giving any useful contributon, just insulting around and acting like a capricious and ill-behaved child.

You have never bothered to read any of the replies, unless asked twice to do so, instead you just kept being offensive and writing nonsense and ignorant stuff. It is called TROLLING, and that's what you are, at this point - just an internet troll: http://en.wikipedia.org/wiki/Troll_(Internet)

Considering your age, it is evident that you will not be able to ever change your rude mindset, so any other discussion with you is useless and a pure waste of time. Please remain firmly stuck to your God-blessed and irremovable ignorance, expressed through bad-mannered writings.

At this point I'm getting out of this discussion, but at least I've told you everything I think about your behavior. Things that I have patiently restrained from saying in the past days, trying to make a constructive discussion with you. All these efforts in vain, such a shame.

 

what ever !! seems i have rattled a few chains here and there !!and i wasnt even trying will have to go back and re read the posts and see how i did it !!
yeah baby !!
Touchy interlects seem to be the same in many differant countries as well Must have something to do with there training and up bringing !! !!
so how can we step this up a little more !! lets take it to another level !!
its about time we heard from the gentle man from Japan again !!
Come on put you hushi down and get in here and strick another blow for the Nihon nation !!
its ok i was married to a Japanese women for 20 years and have a pretty good idea about japanese customs and what gets Nihon Jin all excited !! was the biggest mistake i have ever made in my life and i honestly regreat it
I really should have come to China and married a chinese or even a Korean lady !! . never mind
well have a good weekend eveyone and come back after a rest fully refreshed and ready to give it you best shot .
Come on show us what you made of !! dont give up now peoples true inner personalities are really starting to coming to the surface for all and everyone that read these pages to see !! .

What is it that you missed ?? Dont you understand we are surposed to all be here to help others and to answer question the best we possibly can and give information and pass on knowledge where possible !, if i trod on a few corns it happens ,unintentional but it happens and if you take offence when people speak the truth as they see it thats your problem you dont have to read it Just close off the computer ,take a pill go lay down for a while !
NIght and have a good weekend all !!

 

I've only just come across this thread, but part of the debate seems to be what constitutes a aerodynamic car. So I hope I'm contributing with this link to images of the Aptera.

 

thats easy
lowest cd wins

now I wonder what percentage the air drag of vessel is of the total?

 

Post#22: http://www.boatdesign.net/forums/hy...ar-aerodynamic-method-44955-2.html#post587609

Post #32: http://www.boatdesign.net/forums/hy...ar-aerodynamic-method-44955-3.html#post587642

 

thanks but frontal area is not a good measure
A nascar stock car will go faster than an F1/Le Mans with the same horsepower

 

Frontal area is just a reference area which serve to obtain a numerical value of the Cd (or Cr). You can change the reference area and take one which you believe is more convenient, and the value of Cd (or Cr) will change accordingly.

That's because the overall drag will remain (has to remain) the same, regardless of the reference area used:

Drag = q A Cd , hence:
Cd = Drag / q A

where:
Drag is a given physical value, for a given speed
q is the dynamic pressure, again constant for a given speed.

Cheers

 

Ok, so the cd is not an actual load measured in a wind tunnel

 

No, it is just a coefficient which depends on the reference area used.

A same value of drag force measured on an airplane, on a car or on a ship would give three different Cd's, because airplanes use wing area as reference area, while cars use the frontal area. Ships and boats use several different reference areas, some fictitious like Vol.displacement^(2/3) and some real, like wetted surface, beam^2 etc.

 

I wouldn't be surprised if that was made by the "Hello Kitty" company.
Men who wear sensible hats might prefer a Tatra...
http://www.darkroastedblend.com/2007/06/tatra-car-other-aerodynamic-marvels.html