The bushing tube on the coupler was closer to 1/4". The fin unit was flush with the rear of the Mini-Max airframe tube. 1.25 x 1.34", and I think Semroc has it. I asked Mary@ Estes about the EJ mold and I think it was destroyed in one of Tunik's tax motivated purges.

The thin wall tube and cone has external fantasy hatches and such on the plastic coupler that were not present on the EJ mold. The fin units are the same mold.

It is the BT-11 that sticks out the rear 1/2". The PSII motor mount tube is the same part. There was no thrust ring or retainer hook so it could accept any of the E24, F52, F67 and G76.

Perfect for the new BP 29mm motors. The fin unit has a 160G80 speed limit.

Just Jerry

I don't know if John Boren is listening, but here is the modern parts list he should use to make a 2020 EJ 1340

1 PNC-13-4 RED
1 BT-13-original length whitewall
1 BT-13-original length whitewall
1 BT-13-1/4" bushing tube whitewall
1 TC-13-3 whitewall
1 PP-13 plywood plate w/center hole ply
1 SE-1 screw eye
1 SCM
1 SC
2 CR-13-29mm
1 BT-29mm
1 FU-Phoenix Bird RED
1 set Enerjet decals
1 Instructions
1 poly bag integrated header
1 face sheet printed 2 colors integrated header
1 Order form for EJ 120G76 motors. $100 each. I'll cheerfully make them.

Fin unit has integrated launch lug.

Just Jerry