Grach's observations:
Service ceiling: (effective) 7300m
Service ceiling:(maximum) 7800m
Best climb speed: (as per manual) 270 kph
Max dive speed: ~750kph
Stall speed Clean (at Max Gross Weight):
Idle: 180 kph
Power: 150 kph
Stall speed Dirty (at Max Gross Weight):
Idle: 160 kph
Power: 130 kph
TAKE OFF:
RPM ... 2600 to 2700 rpm
Rotate ... 190 kph
CLIMB:
Speed ... 250 to 300 kph
RPM ... 2600 rpm
Supercharger ... Above 1500m
Mixture ... Progressively Lean (Check Exhaust Colour), Full Lean above 3000m
CRUISE:
RPM ... 1700 rpm, Economy
Manifold Pressure ... 500mm
Speed ... 280 kph
Supercharger ... Select above 350 kph
COMBAT:
RPM ... 2650 to 2700 rpm
Water Temperature ... 90decC to 100degC, Max 110degC
Oil Temperature ... Max 115degC
LANDING:
RPM ... 2600 rpm
Oil Radiator ... Closed
Water Radiator ... Closed
Speed ... Below <300 kph
Gear ... Down
Speed ... Below <250 kph
Flaps ... Down
Approach ... 200 to 220 kph
Touchdown ... 180 to 190 kph
The Yak did not have a locking tail wheel. It uses the same odd differential braking system as the Spitfire.
Very grateful to Wolfhnd for the information