Force on an object for different wind strengths

[cameronke]

Can anyone point me in the direction of any information?

I would be interested in particular the force on a vertical, round column such as a mast.

Thankyou in advance

Cameron

 

[Shanty]

Funnily enough, I've just been doing that calculation. The formula you want is:

Force = 1/2 x density of air x area of mast x wind speed squared x shape coefficiant (for a round mast use 0.6)

Don't forget to allow for wind shear.

 

[silver-fox]

If you are trying by any chance to work out the effects of windage then look at this site by Alain Fraysse who seems to have covered all the bases and offers a few formulae too!

hope this helps

 

[cpedw]

I endorse Shanty's response but feel compelled (in my capacity as an Engineering Lecturer) to point out that it's vital to use a consistent set of units when working out the sums.
For me, the only way to get right answers is to use SI units - density in kg/cubic metre (air 1.2); area in square metres, wind speed in metres/sec (1 knot=0.51m/s).
The force calculated will be in newtons; divide by 4.4 to get a result in pounds if you must.

Derek

 

[cameronke]

Thank you all very much!

Silver Fox, do you have the link please?

Regards
Cameron

 

[pampas]

Try this site might be of use. http://www.dulhunty.com/dmp2.htm

 

[silver-fox]

Sorry about that! I thought I had included the link - obviously a senior moment /forums/images/graemlins/blush.gif Let's try a second time...

http://alain.fraysse.free.fr/sail/rode/forces/forces.htm

 

[cameronke]

Thank you all once again, very much appreciated.

Regards
Cameron