Say Earl, what was the real world startup check list, then all of the things you had to listen, feel and watch for with WW2 era engines when you flew them? How long did it take between starting the check list and wheels up on average?
Once pre-flighted there isn't much else to do. The pre-start check list and start on 4 engines takes much less time than it takes the engines to warm to 40C oil temp so you can taxi.
B-17
Preflight complete
Flight Forms checked
Fuel and oil checked
Doors and exits closed
Transfer valves and switches off
Flight controls free and correct
Generators On
Beacon light on
Strobes off
Static selector - tube
Ignition master switches on
Mag switches off
fuel valves open
Landing gear switch Off
Landing light switch Off
Flaps switch off
Fuel boost pumps off
Turbo Open
Avionic master off
Cowl flaps Open and locked
Mixtures idle cutoff
Props High RPM
Battery switches checked and on
Hyd Pump Check
Gear indicators - 3 greeen
Manifold pressure (noted for field baro power check during sunup)
Chip Lights and Hyd pressure warning lights - test
Parking brake set
Start:
Desired engine CLEAR and confirmed by ground crew
Boost pump on
Engage starter and count 6 blades
Primer on count 3 blades
Magneto On - engine will start on the 12th blade (usually) - tickle the primer to keep it running
Mixture to Auto Rich
After all started
Avionics master on
Oil Pressures checked
Boost pumps off
Vacuum checked
Temps 40C before taxiing
Oil Pressure check
Oil Pressure