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To: marcos who wrote (13117)6/10/2006 10:13:48 PM
From: E. Charters  Read Replies (1) | Respond to of 78417
 
try using a 686 computer that runs at least 1 ghz and has 500 megs of dram with a hd of perhaps 80 megs. at the very least. a 17 inch monitor LCD.. windows 2000 is slightly faster than most. If you don't run 2-3ghz with win xp you will be drumming your fingers.

if u hide a laptop in the bathroom under a whole bunch of car magazines or taped to the inside of the cistern with a couple of bottles of sol with duct tape then you go in there and log on, surf for afew hours uninterrupted. When someone comes by, you make straining sounds and ask for tp and a laxative or slosh some water around in the tub.. turning the dvd player up a tad.

greasing nipples is a task you have to get to at regular intervals. I have a few machines that need that after only few hours of op.

Coriolis corrections are part of every art off's book for everything north of a field howie. That is why they survey guns in. Direction is needed for coriolis corrections as the howitzer compass direction table indicates. Often they survey guns by map reference and sounding.

From observer point to reference point a directional line or rhumb line can be referenced by sound or light. This gives a trial line for survey point in fog or cloud cover. this gives lat, and direction. with lat and direction you can get a metric correction for bag charges x for gun elevation y to target elevation z. this translates to so many mils windage for so many mils elevation of barrel. the tragic-story of shell, which lobs semi-parabolic, changes in velocity continuously, and changes rotation speed relative to forward velocity as velocity changes, constantly throughout its path. This affects precession gyro-effects in the gravity field. As the direction changes of the trajectory, the "gyro" of the shell-spin induces precession variously throughout the path. As well, the changing drag of the air in the shell envelope induces varying speeds and envelope shape changes with increased height. There are many integrations to formulate the probable path of the shell in a real fluid. Firing for effect is most often done, but modern calcs are able to find the probably landing point very closely in most situation. Wear on the barrel is always a factor.

No doubt some stocks have a parabolic envelope very similar to a shell, rising slowly and falling fast.