Instead, please physically wrap something (such as a piece of paper, tape or measuring tape) around your tube, mark it, and measure it to get an exact circumference. (if you squeeze your tube just 1/8″ you will be off by almost 1/2″ when doing the math!!!!). More often than not, you’ll squeeze the tube (even just a tiny bit) when measuring diameter/radius, which will give you the wrong number right from the get-go and your math will be wrong, ACTUALLY IT WILL MULTIPLY YOUR SMALL ERROR BY 3.1415 NOW making it a HUGE error. When finding your circumference, DO NOT simply “do the math” or use calipers to take your measurement then do the math. PLEASE ALSO REMEMBER WHAT A TUBE IS ADVERTISED TO BE IS ALMOST NEVER CORRECT! it may say its a 4″ tube but chances are its either 3.91 or 4.12″ (these are BOTH very common) For this reason, there are far too many circumference sizes to list each one, so we ask you to provide a circumference. For a long time, standard 5.5″ tube was actually 5.38″, for example. Estes made a BT67 that was 2.02″ and a BT70 that was 2.217″. Some manufacturers’ 2″ tubes are actually 1.9″ (like Aerotech). Just because a tube is advertised as a 2″ tube doesn’t mean it’s actually 2″. In rocketry, there are so many different sized tubes out there. Circle Circumference Diameter Circumference It is calculated by multiplying pi times the diameter. Circumferenceis the distance around the outside of a circle – or in our case, a tube.
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