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Rate of descent percentage
794400 created the topic: Rate of descent percentage
Hi all is anyone able topics me some advice on converting a rate of descent into a percentage? Any advice would be very appreciated.
bobtait replied the topic: Rate of descent percentage
The simple 'rule-of-thumb' formula is
RATE OF CLIMB (IN FEET PER MINUTE) ÷ GROUND SPEED (IN KNOTS).
The answer will be a percentage climb gradient. For example, a rate of climb of 750 feet per minute and a ground speed of 100 knots gives a climb gradient of 750 ÷ 100 = 7.5%.
The full derivation of the formula is found on page 74 of my Performance book (page 4.4 of the old book).