Video showing G006 clip from Ron Gray's film.   An English Electric Canberra powered by 2 Armstrong Siddeley Sapphires as a testbed, makes a run-in and break but before touching down, retracts undercarriage and illustrates it's phenomenal rate of climb on the two Sapphires. There is no sound with this clip.   This clip runs for 22 secs. (Thanks to Ron Gray for original film.)