questions about wave resistance and form factor

[Robert Carelli]

Hey all,

I am currently writing a paper for high school, an extended essay for the IB, and I was if you could help me with a couple of things. I have been looking at the different types of resistance on sailboats, and I can't figure out a couple of things. How is the form factor determined for the viscous pressure resistance, and does anything directly influence the wave resistance of the hull like the wetted surface area of the hull effects the frictional resistance? Well that's all for now.

Thanks,

Robert

[Not A Guest]

Taylor and Gertler formula.

[dougfrolich]

Length of waterline, speed of vessel, and displacement will directly influence wave making resistance

[sorenfdk]

Those are the major contributors, but other factors, such as the prismatic coefficient and the LCB, do play a role, too.

Have a look at "The Bare Hull Resistance of the Delft Systematic Yacht Hull Series" by J.A. Keuning. You can find it here: http://www.sailboat-technology.com under the section "Online Articles".

Best regards and good luck with your paper,

Søren

[CDBarry]

What is actually called the "form factor" is a correction used to rescale frictional resistance in model test results, and ca be found in any good naval architecture text.