Hydrodynamic and Aerodymanic Effeciency

[Shane Bastick]

Does anyone know the various formula's to calculate the Lift/Drag coeficient for the aerodymamics on the the top of the hull, and the drag formula's for hydrodynamic drag

any info would be appeciated

 

[lohring]

The definitive engineering reference on this subject is still Fluid Dynamic Drag by Sighard Hoerner. It was once available from his estate, but now can be purchased from several sources for around $100. It is fairly straightforward reading but requires a good understanding of algebra. A review and copies are available here:

https://oscommerce.darcorp.com/product_info.php?cPath=1&products_id=76&osCsid=2cf56ec91b859f5e298d8db829059856

Lohring Miller

 

[Shane Bastick]

Many thanks for the reference guide

cheers

Shane

 

[Charles Perdue]

NASA has a lot of free info online. It is a little difficult to navigate directly to the exact thing that you are looking for. Most of the time you just have to follow the internal links. It is some VERY INTERESTING reading. A lot of math but also some good pics, drawings and graphs on wind tunnel testing.

Charles

 

[shoboat]

NASA huh!

I was wondering where you are getting your information from.

I will have to get out of my shop a little more and start reading.

Thanks,

Mark

 

[kcvnd]

NASA used to have a fluid dynamics lab at the Ames research center in Mountain View CA, they may still I am not sure. This was to support their wind tunnel testing. When I was there they also had the largest bank of super computers in the nation to support their fluid dynamics models. It was very interesting stuff!

 

[Samuel Hagan JR]

Theres a episode on Myth Busters where they made a miniature Wind Tunnel using, water, oats and boat trolling motor.

 

[hugh hargett]

What did they find? What was the myth? Fluid dynamics is real science based on physics and mathematics.

 

[hugh hargett]

If i was going to build one id use a shop vac a 4x4x8 plexi/wood chamber and a cigarette. You also need strobe or some type of still photograpy, so you can look at the eddies. Ive seen formulas for designing monos havent seen any for hydroplanes but Im sure somewhere theres something.

just a cool photo on the subject:

some useful eq's here: http://www.engineeri...ions-d_204.html

http://www.engineeri...ient-d_627.html

 

[Samuel Hagan JR]

They where trying to figure out if you get better gas mileage with your truck lift gate up or down. . You actually get better mileage with it up. It showed how the air swirled around in your truck bed creating less drag and more aerodynamic. It was really neat.