 Using iron construction for warships offered advantages for the engineering of the hull . However , unarmored iron had many military disadvantages , and offered technical problems which kept wooden hulls in use for many years , particularly for long @-@ range cruising warships . 
 Using iron construction for warships offered advantages for the engineering of the hull . However , unarmored iron had many military disadvantages , and offered technical problems which kept wooden hulls in use for many years , particularly for long @-@ range cruising warships . 
Using iron construction fa warships offered advantages ffathe engineering of da hull . However , unarmored iron had many military disadvantages , and offered technical problems which kept wooden hulls in use for many yrs , particularly for long @-@ range cruising warships .