Inverted flat/tailspins in the Mk1s (Spit and Hurr) are always bad, due to their eng cutouts.
I havent tried out Spit, but what did work for me in Hurr1 was:
Gear out!
Rudder input to try to get nose down attitude, in hopes to pick up a tiny bit of airspeed.
Once you have that, dont try to level off and startup eng immediatly, but just let gravity speed you up to 60 mph at least by nosing straight down. Than you can slowly pull out to level, get your eng running again.
Youll always need *a lot* of alt to get out of inv stall - if at all, so the best advice would be as said before. Avoid getting caught into one. Spit1 doesnt have the power to stay in a rope any way and not the firepower for those snapshots - so: keep your speed up and make them come to you
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