(for ROCKETS) what does BT-10, BT-20, mean?

Question

could someone please give me an explanation of the code? I am building a rocket and I don't know what they mean. Thanks

Answer 1

With Estes model rockes, BT stands for Body Tube.

BT-20 is a package of body-tubes: BT-20 Body Tube (4 pk)

Product Number: 303085

High quality spiral wound paper tubes. Use tube couplers to connect tubes of the same diameter. . BODY TUBE SPECIFICATIONS: BT-20: Inside Dim. (in./mm)-0.710/18.0. Outside Dim. (in./mm)-0.736/18.7. Length (in./cm)-18.0/45.7. Picture shows sizes of every size of Body Tube Packs.

Here is an interesting link to a model rocket course from Estes: http://www.esteseducator.com/Pdf_files/1...