7.1 Rolling Period Test (inclining test)

7-1

For the purposes of paragraph 7.0 above, the ship may be subject to a Rolling Period Test and the GM obtained from the following formula:

	GM =	(F r B)2
		Tr
	where
	GM =	metacentric height (metres)
	B =	moulded breadth of ship (metres)
	T =	time for one complete oscillation (ie for one complete roll port-starboardport or vice versa) (seconds)
	S-506
	Fr =	rolling period factor determined from the following table:

Conditions of ships	Rolling period factor
(a) Emptyship......................... ......................... ......................... ......................... ......................... ......................... ......................... ......................... .........................	0.88
(b) Ships carrying ballast......................... ......................... ......................... ......................... ......................... ......................... ......................... ......................... .........................	0.88
(c) Ship fully loaded and with liquids in tanks comprising the following percentage of the total load on board (ie cargo, liquids, stores, passengers etc)
(1) 20% of total load......................... ......................... ......................... ......................... ......................... ......................... ......................... ......................... .........................	0.78
(2) 10% of total load......................... ......................... ......................... ......................... ......................... ......................... ......................... ......................... .........................	0.75
(3) 5% of total load......................... ......................... ......................... ......................... ......................... ......................... ......................... ......................... ......................... (Order of accuracy of factors + or − 0.05)	0.73