Not CL - Enjoy😉

[Paul Taylor]

[FLOYD CARTER]

AMAZING!  They have to be careful because the Spit engine does not run inverted (not very long).

Floyd

[Glenn (Gravitywell) Reach]

WOW!!!

[Hoss Cain]

AMAZING!  They have to be careful because the Spit engine does not run inverted (not very long).

Floyd

None with Carburetors did the inverted for more than about 15-20 seconds. The P-51 (F-51) was restricted from inverted flights and  any negative G's.
At least that is what my Dash-1 Manual says. I never flew one, got a ride in one, but I do have a flight manual.
In the years of privately owner-ships, the owners have changed to fuel injection, same as the Germans had in the ME-109s and others.

One of the cute things that one can catch a judge on in CL inverted flight is, "Does that specific P-51 have  fuel injection modifications as the subject real P-51 ?"

[Steve Thomas]

The Merlin negative-g cutout was largely solved by mid-1941 with the adoption of Miss Shilling's Orifice (stop sniggering, you lot). Inverted time was still restricted compared with something like a DB601, but I don't know why you'd want to use negative g for any length of time in combat anyway.   The problem was solved properly with the introduction of pressure carburettors in 1943.

What's interesting is that it wasn't just an issue with early Spitfires and Hurricanes  - the Zero was found to have the same thing.

Nice clip, btw!