AX3/4 female World Altitude record
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Uploader Comments (IrishHopper)
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Great video! I have a question about cold descents. Just how cold is a cold descent? Can one safely fly from 14k feet to the maybe 1000 feet AGL with no heat applied at all? I've done some chilly descents, but never have allowed it to go 100% cold yet.
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Further comments - On a record flight where fuel conservation is important, there is no point whatsoever putting in small burns during a cold descent (unless the mouth is showing signs of wanting to close!) as any heat is immediately cooled (and therefore wasted) - Malcolm
IrishHopper 3 years ago
The internal temperature on a true cold descent is that of the ambient. The descending airstream maintains the internal pressure. The terminal velocity will depend on how heavy the balloon is. We flew a 60 in Italy last week with an ultralight basket, one-up, and it wouldn't exceed 450fpm in a descent from 10,000 feet. without venting further. Pauline arrested her descent at around 1000 feet agl. Malcolm
IrishHopper 3 years ago