Hi
Tempest Mk.V unit 492 in the British OOB seems to have 4 Rockets too many? amongst the many links Ive explored on the plane every one mentions that the plane only carries 8 rockets rather than the current in-game 12 rockets. This link
http://en.wikipedia.org/wiki/Hawker_Tempest
also says this about Tempest Armament,
"8× 3 in (75 mm) RP-3 rockets (post-Second World War)"
ie Wikipedia seems to think they only carried bombs not rockets during WWII