Seat descent time on drogue

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T-45A UJPT, E2-C2, ADV, & IUT Seat-01
Aeromedical Aspects of Emergency Egress (NACES)
C.
Seat descent time on drogue
Sg 7, fr 6
NACES Seat Descent
1.
Seat descent speed on drogue depends on
Time on Drogue
height
* Seat descent speed on drogue
a.
At 50,000 ft, approx 300 ft/sec
depends on height
- @ 50,000 ft=approx 300 ft/sec
b.
At 18,000ft, approx 200 ft/sec
- @ 18,000 ft=approx 200 ft/sec
* Example
- Ejection seat initiated @
30,000 ft
- Seat falls at approx 250 ft/sec
- In 4.8 sec seat falls approx.
1,200 ft
- 30,000 ft minus 1,200 ft =
28,800 ft
- 28,800 ft minus 18,000 ft =
10,800 ft
- Falling 10,800 ft @ 250 ft/sec =
approx 43.2 sec
THEREFORE T=43.2 SEC
(9-99) Original
Page 1-26

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