British FM killing the fun of the game for allied pilots.

[Osprey]

Which type?

I recently read in a RR Heritage book on the Merlin that rolling in the Hurricane eventually caused lubrication problems and rough running but not to the point of seizure. RR had to test this and ran tests of 150 continuous aileron rolls before any of these signs appeared, but no seizure. IIRC the pilot doing this was the same one who managed that .92 mach Spitfire dive @ FAE (major parts fell off during the dive and the engine oversped to something like 4200rpm, but he still landed OK)