[PSUBS-MAILIST] basic hidrodynamic question

["Alec Smyth" <asmyth@hsomail.com>]

Hello all,

Over time I've accumulated a fair little sub-related library, but I've come
across a VERY BASIC calculation I can't find a formula for in any of my
books. I need to work this out as part of dimensioning the axles for my dive
planes.

Lets say I have a perfectly flat, rectangular dive plane, with a surface
area of 120 square inches, and I am doing 8 knots. Suddenly I incline the
dive plane downwards by 30 degrees. What's the magnitude of the resulting
force? I do realize the force is normal to the plane surface, and I expect
one gets to it by calculating the pressure and then multiplying by the 120
square inches... but that pressure is eluding me.

I wonder can anyone help?



Alec Smyth

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