# Bird Strike Calculator for Plexiglass

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Bird Strike Calculator for Plexiglass
User enters values in blue text only; all other values are calculated.
For educational purposes only. Do not use for aircraft or structural applications.
Simplified analysis contains assumptions and rough estimates.
www.apollocanard.com

Weight of Dumb Bird:             w=          2.25   lb
Impact Area for Bird Body:            a=         18.3   in^2
Closing Speed or Aircraft Velocity:            V=         300.0   ft/sec          177.62 kts (TAS)
Angle of Window From Horizontal:                Q=          40.0   deg         0.6981316 rad
(angle should be 1 to 90 degrees)
Window Thickness Should Be:                           0.30    inch

Per FAA database: 92% of bird strikes occur at or below 3,500 feet above ground level

Weight & Area Data for Commonly Struck Birds                                                           Impact Area Estimates
Bird Type                   Average Weight             Impact Area              Average Length   Body Diameter   Impact Area   Weight / Area
Sparrow / Swallow                         0.07 lb                  1.6 in^2          >         6.2 in        1.426 in        1.59709      0.0438
Blackbird / Starling                      0.15 lb                  2.8 in^2          >         8.2 in        1.886 in        2.79366      0.0537
Pigeon / Dove                       0.70 lb                  7.1 in^2          >        13.1 in        3.013 in        7.12997      0.0982
Crow                       1.10 lb                 13.5 in^2          >        18.0 in        4.140 in       13.46140      0.0817
Hawk / Falcon / Seagull                      2.25 lb                 18.3 in^2          >        21.0 in        4.830 in       18.32246      0.1228
Raven / Mallard                       2.60 lb                 22.0 in^2          >        23.0 in        5.290 in       21.97864      0.1183
Horned Owl                        3.50 lb                 23.9 in^2          >        24.0 in        5.520 in       23.93138      0.1463
Turkey Vulture                       4.40 lb                 32.6 in^2          >        28.0 in        6.440 in       32.57326      0.1351
Eagle                      11.00 lb                 45.2 in^2          >        33.0 in        7.590 in       45.24526      0.2431
Canada Goose                        13.20 lb                 55.4 in^2          >        36.5 in        8.395 in       55.35169      0.2385
American Pelican                       20.00 lb                 91.8 in^2          >        47.0 in       10.810 in       91.77849      0.2179

Calculations
Normal Comp of Vel:          Vn =        192.84 ft/sec
Kinetic Energy:         T=        1299.19 ft-lb
Strain Energy absorbed by
volume Vo of window:      U = K*Vo

Modulus of Toughness:             K=        238.00 ft-lb/in^3   stretched acrylic
U=T
Vo = T/K =         5.46 in^3

Thickness of Window:     t = Vo/a =         0.30 inch

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 views: 12 posted: 10/3/2012 language: English pages: 1