Start-up to take-off
...Still haven't seen a plausible answer to HALTONAPP's original post: why does the C130 'noise' go on so long? Other threads at other times have mentioned ground runs for maintenance/test purposes. Is that what he can hear?
As for start-up to take-off, I notice that commercial airlines (generally with newer kit than RAF) don't start-up until they are being pushed back. Contrast with RAF (albeit with VC10 and Tristar) who seem to start-up well before push-back. Maybe out Voyagers don't start until being pushed back?
Regards
BATCO