I know the LW rockets leave the racks on, which affects the clib rate, turn rate, and top speed. I usually do NOT take the LW rockets. However, if you are in a 190- the 500kg bomb and the 2 rockets will take out a VH about 50% of the time. Still havent figured out why it isnt 100% of the time, but that is another story. I've heard that the p47-D25 also has tube launched rockets- and the tube would stay on the plane there as well. The D30 has rockets that don't have a tube, so I assume there is no performance degradation after they are fired, I could be wrong though.