Tom, you came into this saying that you wanted to use Speed as the trigger for Flap Retraction rather than Height, we argued that you couldnt due to the acceleration portion of the takeoff and the height to initiate this acceleration. You are fixated on 400 feet an 1500 feet, but in reality we can use any altitude with the thrust limits.
Gross
Gross Track Gross X Lateral Gross
Distance Distance Offset Height
FEET FEET FEET FEET
-------- -------- -------- --------
Screen Height 7443 7443 0 35
Gear-Up 11320 11320 0 173
Level-Off 100000 100000 0 3175
Start Final Climb 136643 136643 0 3175
Or
Screen Height 6551 6551 0 35
Gear-Up 10565 10565 0 245
Level-Off 59064 59064 0 2855
Start Final Climb 82945 82945 0 2855
Both of these are clearing the same distant obstacle. So for aircraft like these, the only way that you can ensure that you will clear obstacles is by following the specifed flight path, you must use an altitude for flap retraction/acceleration and not a speed.
So to end, you have 0 flap performance data in the Hawker, so you can accelerate in the climb and retract the flaps. But for a lot of other aircraft that need to accelerate more than the Hawker does, then you cannot use a speed reference for Flap Retraction/Acceleration.
Mutt