wsherif1,
You prob already know this, 0.8G is not a force its and acceleration.
As previously posted, the FDR recorded acceleration corresponding with a series of rudder movements, to the limit of those rudder movements.
There is
no suggestion by any party to say the aircraft experienced 0.8g acceleration in yaw without any movement of the rudder.
The wake vortex figure you mention (300 ft/sec) would not be the figure 4-5 nm behind the lead 747, due to mixing with the atmosphere the vortex would be significantly weaker.
The wake vortex from the preceeding 747 was reduced as the aircraft gained distance from the departure point, induced drag (hence vortex) reduced with an increase in speed, stowing of high lift devices, and burn off of fuel.
Many aircraft have experienced this level or greater vortex passing esp in the north west pacific where the sub tropical jet stream is the strongest when flying through any of the jet streams.
