May be you can explain to me
I went on the Kasten site " Beam vs ballast" and at one moment he wrotte :
« …For example, 2,000 pounds of ballast located 5 feet from the roll axis will yield a Rigting Moment (Torque) of 10,000 lb-ft, and a Roll Moment of Inertia of
5^4 x10,000 = 3,125,000 lb-ft^4. By comparison, a 200 pound mast located 25 feet
from the roll axis will introduce a Heeling Moment of 5,000 lb-ft, but will have a Roll Moment of Inertia of 25^4x200 = 78,125,000 lb-ft^4... »
I don’t understand why on this example for the ballast the 2000 pouds was multiplicated by the 5 feet for obtain 10000 and after 5^4x 10000 and at contrario
for the mast the designer took directly 200 (and not doing like the ballast 200 x 25 before appliced the formula)
I could understand if the same way is used for both , but I don’t understand when it is not the same.
Did you have an answer ?
and just for the "fun" of see 'disaster' made by the roll
Le roulis paramtrique