Verification Data (Spatial and Weight) Unguided MK66 • Weight = 23.4 lbs. (7.14 lbs fuel) • Length = 55 in. • x (c.g.) = 30 in. • y (c.g.) = 0.0 in. • z (c.g.) = .002 Guided MK66 • Weight = 34.4 lbs. Max • Length = 79.7 in. Max • Center of Gravity - Move Aft - Decrease Yaw Rate on Missile - Remain Neutral in y & z
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Verification Data (Spatial and Weight) Unguided MK66 Weight = 23.4 lbs. (7.14 lbs fuel) Length = 55 in. x (c.g.) = 30 in. y (c.g.) = 0.0 in. z (c.g.) =.002.
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Verification Data(Spatial and Weight)
Unguided MK66
• Weight = 23.4 lbs. (7.14 lbs fuel)
• Length = 55 in.
• x (c.g.) = 30 in.
• y (c.g.) = 0.0 in.
• z (c.g.) = .002
Guided MK66
• Weight = 34.4 lbs. Max
• Length = 79.7 in. Max
• Center of Gravity
- Move Aft
- Decrease Yaw Rate on Missile
- Remain Neutral in y & z
Verification Data(Performance)
Consideration #1: Design to sustain Max g’s.
• Mechanical – stress concentrations on moving parts (i.e. canards)
• Electrical – tracking, servo response
•SL-MTI DC Servomotor
•MIL spec, designed for missile fin actuation
G Load vs. Time
-10
0
10
20
30
40
50
60
70
0 0.2 0.4 0.6 0.8 1 1.2 1.4
Time (s)
G's
(g
)
Max G’s: 64.8g
0
10
20
30
40
50
60
70
80
90
0 0.2 0.4 0.6 0.8 1 1.2 1.4Time, s
G-L
oad
G-LOAD TREND FOR HYDRA MISSILE SERIES WITH AND WITHOUT AVIONICS MODULE
G-Load W/ Maximum Avionics Module Weight (7.3 lbs)
G-Load for Unmodified Hydra Missile
Guided Max G’s: 80g
Consideration #2: Design to sustain max jerk.
• Jerk is the rate of change of acceleration
• Commonly called pulse, impulse, shock, bounce, or jolt
• Important when evaluating destructive force on components
Jerk vs. Time
-400000
-300000
-200000
-100000
0
100000
200000
300000
400000
0 0.2 0.4 0.6 0.8 1 1.2 1.4
Time (s)
Jerk
(m
/s^
3)
Max. Jerk: 291,786.7 m/s^3
Consideration #3: Thrust and Engine Burn-out
• Engine burns out at 1.2 seconds
• Max thrust occurs at .965 seconds
• Burn-out corresponds to approx. horizontal distance of 317m (4000m range)