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Last, but not least. If we hoist the 100 pound weight to the top of the mast and apply the same 5 degree forcing step, we see that the acceleration is reduced even further to below 0.2 rads/s^2. And we see that the frequency reduces a bit more.
Now given all these graphs.. would I hoist a 100 pound weight to the top of my mast during a storm? Not likely. These graphs consider the dynamic effects of the added mass. WE need to also consider the static effects of the 100 pounds at the top of a 60 foot mast that produces a heeling moment of 6000 foot pounds. This is a quite significant heeling moment to add to a boat that may have a righting moment of 70000 foot pounds.
Even worse is that this heeling moment is a mass heeling moment rather than a hull moment. So as they say on tv.. "Don't try this at home.."
Last edited by BryceGTX; 03-01-2012 at 10:24 PM.