Originally Posted by
dixi188
RET = Rapid Exit Taxiway. ie. 15 to 30 degrees off the heading of the rumway.
If you line up via one of these then you can have 20 knots or more before you start the take off roll.
Theoretical considerations:
20 knots =37km/h=10 m/s
Assuming the 737 accelerates at 0.2g, that takes approximately 5 seconds / 25 meters / 80 feet, which is the runway distance you could save.
"rolling out onto the runway at 8kts with 40% set and pressing TOGA 50 or 60 m further down the runway" would be worse?
8 knots is about 2 seconds of acceleration, so 4 meters of runway?
I've not considered engine spoolup here, but in that regard, putting the brake on and going to 70% before commencing the roll is probably beating any rolling start.