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. Circumference is the distance around the outside of a circle – or in our case, a tube.
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