This document provides information about the geometry, material properties, self-weight, and 4G load cases of a helicopter structure. It includes the elastic modulus, density, yield and ultimate strengths of the materials. Under self-weight, the total forces on the helicopter floor are summarized. For the 4G load cases, the document lists the forces applied in the X, Y, and Z directions to simulate 4G accelerations in each direction.

2. Contents
Contents........................................................................................................................................................2
..................................................................................................................................................3
Information Provided ................................................................................................................................................3
Camera ......................................................................................................................................................................3
Geometry ..................................................................................................................................................................3
Other Information.....................................................................................................................................................3
.....................................................................................................................................4
........................................................................................................................................4
.................................................................................................................................5
Material Properties ...................................................................................................................................................5
Springs.......................................................................................................................................................................5
Helicopter Floor.........................................................................................................................................................6
Point Mass.................................................................................................................................................................6
............................................................................................................................................6
Self-Weight................................................................................................................................................................6
4G Loads....................................................................................................................................................................6
..........................................................................................................................................................7
Self-Weight................................................................................................................................................................7
4G Load X ..................................................................................................................................................................9
4G Load Y.................................................................................................................................................................10
4G Load Z.................................................................................................................................................................12
..................................................................................................................................................14

3. Information Provided
Camera
Geometry
Other Information




5. Material Properties
Elastic Modulus 2.10E+11 Pa
Poissons Ratio 0.3
Density 7850 Kg/m3
Sy 520 MPa
Su 750 MPa
Springs

6. Helicopter Floor
Point Mass
Self-Weight
4G Loads

7. Self-Weight

8. X = −177.92 − 177.58 + 177.9 + 177.6 = 0
Y = −299.93 − 299.74 − 299.96 − 299.74 = −1199.37
Z = 190.86 − 190.63 − 190.68 + 190.56 = 0.11
1Y -299.93 N
1X -177.92 N
1Z 190.86 N
2Y -299.74 N
2X -177.58 N
2Z -190.63 N
3Y -299.96 N
3X 177.9 N
3Z -190.68 N
4Y -299.74 N
4X 177.6 N
4Z 190.56 N

9. 4G Load X

10. 4G Load Y
4G in X
X1 1338.4
Y1 -967.19
Z1 -1.377
X2 1338.2
Y2 -967.28
Z2 -2.446
X3 1338.2
Y3 1211.6
Z3 1.5541
X4 1338.4
Y4 1209.3
Z4 2.2344

12. 4G in Y
X1 0
Y1 -1008.3
Z1 0
X2 0
Y2 -1008.4
Z2 0
X3 0
Y3 -1010.9
Z3 0
X4 0
Y4 -1009.2
Z4 0
4G Load Z

13. 4G in Z
X1 1.5899
Y1 1030.5
Z1 1373.8
X2 -1.1654
Y2 -1030.5
Z2 1373.8
X3 -2.1857
Y3 -1032.5
Z3 1374
X4 0.9237
Y4 1032.5
Z4 1374