While shooting at shorter or " regular " ranges, one usually has to adjust the sights only in regards to gravity ( which is constant ) but, when the range is extended, wind drift will be the first factor affecting precision to the extent that it must be taken into account.
42.
The base contains several complicated sets of air-driven bellows to create movement, a vacuum pump which both drives the bellows and provides input to a number of aircraft instruments, a device known as a Telegon Oscillator which supplies power the remaining pilot and instructor instruments, and a Wind Drift analog computer.
43.
Although the . 338 Lapua Magnum delivers less kinetic energy to the target compared with the . 50 BMG, both cartridges have similar trajectories, resistance to wind drift and penetration, while the . 338 Lapua Magnum unquestionably outperforms the 7.62?1mm NATO and . 300 Winchester Magnum, especially at ranges beyond and.
44.
At 08 : 15 : 32 UTC, it reached Advent and entered a base turn, reaching a magnetic heading of 160?at 08 : 16 : 28 UTC . While the crew had adjusted for the wind drift, they did not attempt to intercept the magnetic course 155?outbound from Advent.
45.
The ladder aperture sight moves vertically on a slide, and hence was not able to correct for wind drift . The rear sight element was protected by sturdy " ears " and proved to be faster and more accurate than the typical mid-barrel sight offered by Mauser, Enfield or the Buffington battle sight of the 1903 Springfield.
46.
Most center pivot systems now have drops hanging from a u-shaped pipe called a " gooseneck " attached at the top of the pipe with sprinkler heads that are positioned a few feet ( at most ) above the crop, thus limiting evaporative losses and wind drift . There are many different nozzle configurations available including static plate, moving plate and part circle.
47.
Difficulty with the 5.56?5mm NATO at range has been attributed to training; Swedish ISAF units relied on . 50 BMG heavy machine guns for long-range shooting due to resilience to factors such as range and wind drift . Underperformance is thus attributed to errors in range and wind estimation, target lead, firing position, and stress under fire, factors that can be resolved through training.
48.
The second major component is an external instructor's desk, which consists of a large map table; a repeated display of the pilot's main flight instruments; and the Automatic Recorder, a motorized ink marker also known as the " crab . " The crab is driven by the Wind Drift computer and moves across the glass surface of the map table, plotting the pilot's track.
