A .45 cal pistol will always be called a "45". A .22 will always be a "22". a .50 cal machine gun will be called a "50 cal", no matter what. The Army tried to standardize everything to metric many years ago and the 4.2 inch mortar became a 105mm mortar until someone pointed out that it was closer to 106mm. All the while, we were laughing because "4.2 inch mortar" was cast right on it, which is what we kept right on calling it for another 30 years. In the US, frame construction is common with "2x4x8" studs set on 16" centers making "4x8" pieces of sheetrock, plywood or paneling a most sensible dimension, I would say. As far as the actual construction, a true woodworker or journeyman carpenter knows their dimensions and uses them automatically. 4 of my uncles were carpenters and could build stairways without making notes (other than some undecipherable pencil marks on the lumber). The Interstate Highway system was to have been measured in kilometers but only one state did and eventually received millions to convert everything to miles. I've flown aircraft manufactured in europe with metric airframes powered by US engines measured in SAE. I've flown cockpits with 4 altimeters (2 for each pilot) so as to be able to set altimeter in either inches of mercury or millibars. But guess what? The altitude displayed is always in feet, period. Even though the instrument is named "alti-METER". Flight levels are expressed in feet (FL360, etc). I've always preferred the Farenheit scale over the Celcius scale because small temperature changes can be detected sooner but I don't know who identified the Celcius scale as "metric". The acre is so commonly used that I doubt we will ever go to hectares or 2.471044 acres. With our system of land measurement we use 1/4 mile, 1/2 mile up to sections which are 640 acres (one square mile)or 258.992 hectares. Who"s going to change all this? Not me. I'm perfectly comfortable with a 40 acre plot having 1320 feet on each side which happens to be 1/4 of a mile. In the flying world, speed is most oftenly measured in "Knots" which makes sense since one nautical mile is, in equivalent distance, one minute of latitude.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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