Module: Ballistics::Utils

Defined in:
lib/ballistics/utils.rb

Class Method Summary collapse

Class Method Details

.free_recoil(bullet_weight, propellant_weight, velocity, firearm_weight, propellant_velocity = 4000) ⇒ Object 



25
26
27
28
 
# File 'lib/ballistics/utils.rb', line 25

def self.free_recoil(bullet_weight, propellant_weight, velocity, firearm_weight, propellant_velocity=4000)
  recoil_impulse = recoil_impulse(bullet_weight, propellant_weight, velocity, propellant_velocity)
  return (ACCELERATION_OF_GRAVITY * recoil_impulse.to_d / firearm_weight.to_d)
end

.kinetic_energy(velocity, bullet_weight) ⇒ Object 



13
14
15
 
# File 'lib/ballistics/utils.rb', line 13

def self.kinetic_energy(velocity, bullet_weight)
  return (0.5.to_d * bullet_weight.to_d * velocity.to_d ** 2.to_d / 7000.to_d / 32.175.to_d)
end

.recoil_energy(bullet_weight, propellant_weight, velocity, firearm_weight, propellant_velocity = 4000) ⇒ Object 



30
31
32
33
 
# File 'lib/ballistics/utils.rb', line 30

def self.recoil_energy(bullet_weight, propellant_weight, velocity, firearm_weight, propellant_velocity=4000)
  free_recoil = free_recoil(bullet_weight, propellant_weight, velocity, firearm_weight, propellant_velocity)
  return (firearm_weight.to_d * free_recoil.to_d ** 2.to_d / (ACCELERATION_OF_GRAVITY * 2.to_d))
end

.recoil_impulse(bullet_weight, propellant_weight, velocity, propellant_velocity = 4000) ⇒ Object 



21
22
23
 
# File 'lib/ballistics/utils.rb', line 21

def self.recoil_impulse(bullet_weight, propellant_weight, velocity, propellant_velocity=4000)
  return (bullet_weight.to_d * velocity.to_d + propellant_weight.to_d * propellant_velocity.to_d) / UNIT_CORRECTION_FACTOR
end

.sectional_density(bullet_weight, bullet_diameter) ⇒ Object 



9
10
11
 
# File 'lib/ballistics/utils.rb', line 9

def self.sectional_density(bullet_weight, bullet_diameter)
  return ((bullet_weight.to_d / 7000.to_d) / (bullet_diameter.to_d ** 2.to_d))
end

.taylorko(velocity, bullet_weight, bullet_diameter) ⇒ Object 



17
18
19
 
# File 'lib/ballistics/utils.rb', line 17

def self.taylorko(velocity, bullet_weight, bullet_diameter)
  return ((bullet_weight.to_d * velocity.to_d * bullet_diameter.to_d) / 7000.to_d)
end