Ballistics Flashcards
(25 cards)
What is projectile jump and when does it occur when firing from a hover?
Jump experienced by a projectile when it initially leaves the muzzle due to clockwise spin imparted by the barrel. Happens when barrel is pointed in any other direction other than into the relative wind. Typically does not occur when firing from a hover unless there is crosswind.
What determines the amount of lead required when firing off axis to the right or left?
Aircraft airspeed, angle of deflection, projectile velocity and target range.
At approximately ____ knots indicated forward airspeed, the influence vector is moved just aft of the rocket launcher forward bulkhead, thus reducing down wash to_____?
33 ; 0
What are the Terminal Ballistics?
A projectiles characteristics and effects on a target.
What interior ballistic characteristics can the aircrew compensate for?
Aircrews cannot compensate for these characteristics when firing free-flight projectiles.
Which Exterior Ballistic is not compensated for by the WP/MP?
Angular Rate Error (Pitch/Roll/Yaw Changes)
What is angular rate error and how do you prevent or minimize it?
Angular rate error is caused by the motion (pitch, roll, and/or yaw) in the launch platform as a projectile leaves the weapon. Steady platform.
What is the definition of ballistics and what are the four types of ballistics?
Ballistics is the science of projectile motion and conditions affecting that motion. Interior, exterior, aerial, and terminal.
What are the Interior Ballistics?
Characteristics affecting projectile motion inside the barrel or rocket tube. It also includes effects of propellant charges and rocket-motor combustion.
Fragmentation pattern length ____________ with high-angle impacts.
Decreases.
If several projectiles are fired from the same weapon with the same elevation and deflection settings, the individual points of impact will be scattered about the aim point. The degree of scatter of these rounds is called _____________.
Dispersion.
Define maximum effective range.
Distance at which there is a 50-percent probability of both hitting and defeating a target.
Why is the Aerial Rocket System more accurate when fired from an OGE hover rather than an IGE hover?
IGE launch yields greater dispersion, because the aircraft cannot apply appropriate downwash compensation due to random Induced Flow pattern.
With the _________ as the selected sight, lead-angle compensation is not computed or added to the gun turret or rocket pylon position command, nor is the target state estimator employed.
IHADSS.
The altitude from which the projectile is fired and range to target determines ___________ and ________________.
Impact Angle ; Fragmentation Pattern.
What are the Exterior Ballistics?
Influences on the motion of the projectile as it moves along its trajectory.
Is Projectile Jump compensated by WP/MP?
No.
What is it called when projectile drift and trajectory shift combine with each other?
Port Starboard Effect.
What exterior ballistic causes a clockwise spinning projectile to move to the right?
Projectile Drift.
What are the aerial ballistic characteristics affecting fin-stabilized projectiles?
Propellant force, CG, relative wind.
What causes a rocket to seek into a crosswind or impact past the target when fired during an accelerating climb?
Relative wind Effect.
__________ is additional type of fragmentation is produced by target structure itself.
Spall.
What are the Aerial Ballistics?
The characteristics of a projectile whether it’s spin or fin stabilized.
What is the cause of the greatest error for free flight rockets (besides poor pilot technique) and what is done to minimize that error?
Thrust Misalignment.
