Most of the Spitfire V Merlin 45 data has maximum boost is 9 lb. or 16 lb. What date was the 9 lb. boost increased to 16 lb., or 12 lb.? 
My favorite Spitfire site Spitfire Performance Testing
Boost (lb/sq.in.)
(i) Max. for climbing (normal rating)(1 hr. limit) +9
(ii) Max. for all-out level flight (normal rating)(5 minute limit) +9
(iii) Max. for all-out level in special emergency (prior to increase to +16) +12
(iv) Max. for climb and level flight (combat rating)(3 min. limit) +16
Whan date was special emergency +12 boost used?
Thank you!
My favorite Spitfire site Spitfire Performance Testing
Boost (lb/sq.in.)
(i) Max. for climbing (normal rating)(1 hr. limit) +9
(ii) Max. for all-out level flight (normal rating)(5 minute limit) +9
(iii) Max. for all-out level in special emergency (prior to increase to +16) +12
(iv) Max. for climb and level flight (combat rating)(3 min. limit) +16
Whan date was special emergency +12 boost used?
Thank you!
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