Hi guys,
Of course....the Allison CONSTANT SPEED engine revolved at 13,820 rpm ALL the time.....therefore, instant power!!
Also, I thought the Airbus A320, especially that real early example, I think doing a little demo, for a small crowd, somewhere in France, took a REAL long time to wind-up, I think I could just hear the sound of those engines winding up as it was decending into the treeline!!
That WAS an example of how unexpectedly long it takes to wind up from ground idle (in his case!), to full power, too long!!
That's why Boeings have both a ground and flight idle setting, as mentioned prior, to flight idle when either 25 or 30 of flap are set, at least on the B747 Classic!
Cheers