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13th September 2004 | 23:01

#5 (permalink)

Genghis the Engineer

Moderator

Joined: Feb 2000

: CPL

Posts: 14,480

Likes: 178

From: UK

Sorry Thunderball, but at 35,000 ft the air density drops to about 35% of it's sea level value, which would bring my crude back of envelope sum down to about half a tonne per second - still in the same ballpark.

G