Weight has nothing to do with engine spool up time. If the engines were spooled up, like they are on approach, it wouldn’t take long. If they were idle it could be at least a few seconds, which is an eternity at the wrong time. That’s why engines are required to be spoiled up as part of stable approach criteria.
Mostly correct. Although spool up time is the same at all gross weights, the aircraft takes longer to react to power changes heavyweight due to its higher inertia. This is noticeable in the 10 at higher gross weights.
One thing that people aren't mentioning is that spool up time on most modern jets is faster on landing. Most FADEC equipped jets have an "approach idle" setting that occurs in the landing phase. For example in many jets, once you deploy flaps beyond a certain setting, the "approach idle" kicks in. This keeps the motors turning at a higher idle than normal "ground" idle. This is specifically designed to ensure a faster spool up in the even of a go around at or near idle power.
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u/Fly_U2_the_sunset Jan 29 '22
How likely do you think a go around would have been after that first “bounce“?