 Complete the following phrase:  The 330 mm guns had many faults. They were complex and moved with a weak system for such turrets roughly the weight of an Italian 381 mm triple turret. They had two 100 hp engines but only one was typically used. Despite the great range, elevation was only 35 therefore the gun had a very high muzzle velocity of 870 ms. The guns were coupled in two twin arrangement, sleeved in pairs. The turrets were heavily protected, and internally had a 2540 mm bulkhead to separate the two twin mounts. This was important at 