So I'm down at THE US Air Force Museum in Dayton, Ohio, and what did I find there, but a non-mobile 4x20mm Germain antiaircraft gun platform. We see it in Aces High as the mobile version, known as the Wirbelwind. One thing I noticed, it has DETACHABLE clips, so it has to have someone remove the clips when they are empty and replace with full clips. Unlike the US shipboard quad 40mm's that could be continuously reloaded, the Wirbelwind cannot fire the specific gun during the reload process, or if the clip is empty. There were 2 re-loaders, one on each side of the gunner, each responsible for 2 guns. What I couldn't tell is how many rounds per clip, though they looked shorter than a 30 round AR-15 clip, and being 20mm shells, it looked like it might hold 20 rounds each if they were staggered, though it could have been less, especially if it weren't a staggered loaded clip, and I wasn't trying to confirm that at the time. Too bad I didn't take any pictures.
So, as this is the whishlist area, what I wish for is some realistic reload delay between clips in the Wirbelwind, to make it have a more realistic firing rate.