BT size chart

Im looking for a chart that compares BTsizes . Ya know, some are Airframes,some are Ss ,BTs, Ts, Centuri-Semroc-Estes all dif terminology. Thanks

Is this what you are looking for?

Body Tube Sizes and Ratios

Here are two links you will find invaluable:

https://www.ninfinger.org/rockets/body_tubes.html

https://www.rocketshoppe.com/info/Estes_Body_Tube_List_3.1.pdf

Scotty Dog said:

Im looking for a chart that compares BTsizes . Ya know, some are Airframes,some are Ss ,BTs, Ts, Centuri-Semroc-Estes all dif terminology. Thanks

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A good place to start is the ninfinger list linked herein (and repeated here: https://www.ninfinger.org/rockets/body_tubes.html ).

The Semroc tube offering may present the most comprehensive list I've seen: https://www.semroc.com/Store/Products/BodyTubes.asp

If all you want to do is compare diameters (but not lengths), I've created a more concise Semroc list, but it may not be as up-to-date: https://www.doug79.com/stuff/semroc-tubes.xls

Totally Tubular has a few other uncommon sizes in their mix, including some slip-fit tubes for sliding over common rocket tubes: https://www.wooshrocketry.org/misc/tt.htm

One thing I like about Balsa Machining is that they offer full length couplers which in turn give you a few more options: https://www.balsamachining.com/CATALOG.htm#BT

HTH.

Doug

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All info posted is very help full. Sure is alot a dif size tubes.

Another great resource it the 1974 Estes Custom Parts Catalog:

https://www.ninfinger.org/rockets/custom_estes/custom_estes.html

It lists a lot of BT sizes by both tthe BT designation (ie. BT-20J) or catalog number. I printed one out and keep it handy as a quick off-line reference.