Actually not quite...BT-56 is Centuri ST-13. See the Semroc section of eRockets......
Some time ago I was told BT-56 was the same as ST-13....so I've never looked for BT-56 dimensions. I sit corrected.Actually not quite...
ST-13 is listed as 1.340 OD, 1.300 ID.
BT56 is listed as 1.367 OD and 1.346 ID.
Effectively the same but not interchangeable if you wanted to make a repair. eRockets does list several balsa nose cones for ST-13, none for BT-56
SON OF A ........ Yes, you are correct. I must have fat fingered the eRockets page. My apologies to all. ST13 and BT56 are the same, only 0.006" different.Shouldn't the BT-56 be 1.346 OD and 1.304 ID, just to clarify?
Nope you are correct, I got the dimensions wrong.Some time ago I was told BT-56 was the same as ST-13....so I've never looked for BT-56 dimensions. I sit corrected.
Estes' website still lists the Metalizer, which is BT-56... They also have nose cones, but no tubes. Extra stock maybe?now, yes, it has finally been discontinued.