Fuse 13
To get back to the original thread, the reason that The Reds flew with fuse 13 removed was that they flew clean wing, i.e. no slipper tanks. This reduced the risk of roll-coupling when they "twinkle" rolled. Incidentally, they also had the Mark 4 Hobson unit which reduced pitch sensitivity compared with the Mark 5 fitted to the Valley Gnats. I think the roll rate was something like 415 degrees /second with the fuse out.