B747-400 Initial Buffet Speed 100-230 kts depending on weight, configuration and pressure altitude (0 – 10,000 feet). Based on 1G speeds, Forward CG limits and Idle Thrust.
Max Landing Weight, SL, Clean = 198 kts. The stick shaker speed is a couple of knots higher.
B747-400 Non-normal configuration landing distance, Dry Runway.
Flaps UP – VREF30 +70 Landing Distance 6100 feet based on 250,000 kgs
I’m presuming that the Flaps UP description refers to the Flaps lever position and therefore accounts for Slats and Flaps UP. I’m sure that someone who actually flies them will correct me if I am wrong.
Mutt 