These assumptions made in this calculation:
Head on collision
Bird is riding with the airliner after the collision
Bird’s velocity is negligible compared to that of the airliner
Total time taken to crush the bird (estimated impact time) = Length of the bird / Speed of the airliner
Impulsive applied to the bird
Impulse
Use this simple tool to solve physics problem related to collision between airliner and a bird.
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Useful conversion you may need in this kind of problem
Force
1 lb = 4.45 N
1 N = 1 kg m s-2
1 N = 105 dyne = 0.225 lb
Mass
1 kg = 2.20 lb (where g = 9.8 ms-2)
Speed
1 mi/h = 1.47 ft/s = 1.61 km/h = 0.447 m/s
1 km/h = 0.278 m/s = 0.621 mi/h = 0.911 ft/s
Length
1 ft = 30.5 cm
1 m = 3.28ft
1 mi = 5280 ft = 1.61 km
1 km = 0.621 mi
( mi = mile, ft = feet, km = kilo meter, m = meter, h = hour, s = second )