B747-200 OA411 - Gear retraction during stall
Regarding the issue of the drag effect of the landing gear doors opening up during gear reatraction, I think that many people are unaware of this old, very similar, incident of Olympic Airways back in the 70s with the 747 classic.
On 12-8-1978 the OA411 flights from Athens Hellinicon (LGAT) airport experienced an engine flameout (engine two) during takeoff (at v1).
Additionally even though the takeoff procedure included the use of "water methanol injection" providing additional thrust during the very hot Athens august afternoon, due to cockpit miscommunication, the flight engineer turned off the injection just around V1.
The airplane eventually took off at Vr at the end of the runway just barely managing to pass the first hill (209ft) at 215ft (climb rate less than 200ft/min). During climb, engine 3, also suffered damage and become inoperational.
Under pilot's orders, the landing gear was not retracted due to the fear of drag from the huge landing gear doors opening. This was against company SOPs.
He continued on a level flight aiming for the nearest uninhabited hill near Piraeus but the flight engineer did manage to get a bit more power, thus increasing IAS and letting him reach the sea where he began dumping fuel and eventually retracting the landing gears performing a successful go-around.
Boeing did run the scenario many times in simulators all resulting in a crash ...