Mountain Flying

Can You Out-Climb the Downdraft?

Air spilling over a ridge can sink faster than a light airplane climbs — even at full power and best rate. Density altitude has already shrunk your climb; the downdraft can erase what's left. Run the encounter and see why the fix is rarely "pull harder," it's "turn toward lower terrain."

Ridge encounter

your track sinking air—

If you hit the sink…

Density altitude6,000 ftHigher = less climb available before the downdraft even startsDowndraft strength700 ft/minIn a mountain wave, sink can exceed 1,000 ft/min

Climb at DA

ft/min

Downdraft

−0

ft/min

Net in the sink

ft/min

Reading the encounter

Net vertical speed

Your best rate of climb falls with density altitude, so the very conditions that build strong downdrafts also leave you least able to fight them. That's why the mountain rule is toalways shuttle-climb all the way to your crossing altitude andalways have an escape turn toward lower ground — you can turn away far faster than you can climb away.