These are again sub-divided, usually making three tanks abreast, i.e. a rather large centre tank with small wing tanks to port and starboard.
Ezi kwakhona zahlula-hluliwe, ngako oko zenza isithathu seetanki ezikwilungelo kunobukhulu betanki ngaphakathi ngephiko elincinci leetanki elikwizibuko kunye necala elizinzileyo lenqanawa.