Rick, "9.8 is the gravitational constant. A mass of 1kg experiences a force of 9.8N under the influence of Earth's gravity.
A moment is a force by distance. It has units of Nm in the MKS system."
Yes, that is correct. That is why we use it in the equations like calculating the Fn Froude number, F = V / √ gH, you are probably more familiar with the equation in the hull speed calculation where the g is hidden in the 1.34 constant.
The lift on the wing is proportionate to the effect of gravity, hence the 9.8 conversion factor. Physicists love to simplify all their equations and turn everything into a spherical horse, because many of the problems are intractable otherwise.
Talador
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Posted by: taladorwood@yahoo.com.au
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