Based on the T lower equation it can be found that the screw is self-locking when the coefficient of friction is greater than the tangent of the lead angle.
12.
The negative lead angle of the springing reduces the vertical and horizontal acceleration when driving rapidly across obstacles so that the physical load on the crew is lower compared to vehicles equipped with rigid axles.
13.
Particularly if the lead angle is small, the gear's teeth may simply lock against the worm's teeth, because the force component circumferential to the worm is not sufficient to overcome friction.
14.
The rifle was designed to have a dispersion such that a man-target running at a speed of 6 km / h at a distance of 250 m would be hit even if the lead angle error ( 2 mil ) was off by 51 cm.
15.
To compute lead angles and time fuze setting, the target motion vector's components as well as its range and altitude, wind direction and speed, and own ship's motion combined to predict the target's location when the shell reached it.
16.
The Abrams is equipped with a ballistic fire-control computer that uses user and system-supplied data from a variety of sources, to compute, display, and incorporate the three components of a ballistic solution lead angle, ammunition type, and range to the target to accurately fire the tank.
17.
If the target remained on a straight-line course at a constant speed ( and in the case of aircraft, constant rate of change of altitude ( " rate of climb " ), the predictions became accurate and, with further computation, gave correct values for the gun lead angles and fuze setting.
18.
Servos in the computer boosted torque accurately to minimize loading on the outputs of computing mechanisms, thereby reducing errors, and also positioned the large synchros that transmitted gun orders ( bearing and elevation, sight lead angles, and time fuze setting ) . These were electromechanical " bang-bang ", yet had excellent performance.
19.
Given these inputs, the Mark 1 automatically computed the lead angles to the future position of the target at the end of the projectile's time of flight, adding in corrections for gravity, relative wind, the magnus effect of the spinning projectile, and parallax, the latter compensation necessary because the guns themselves were widely displaced along the length of the ship.
20.
A solution to the problem has been developed by Bill Wylde and it bears his name . . 223 Wylde is not a cartridge, it is a barrel chamber specification-with the external dimensions and lead angle as found in the military 5.56?5mm NATO cartridge and the 0.2240 inch freebore diameter as found in the civilian SAAMI . 223 Remington cartridge-that was designed to increase the accuracy of 5.56?5mm NATO ammunition to that of . 223 Remington.
