The D12 is a detuned D13. The E9 is a detuned E15. The E30 and the D20 I saw fly in person were never released but a bunch of prototypes were made. The detuning of motors are done because BP motors continue to cure after shipping and performance varies quite a bit with temperature and humidity. The D13 had a fairly high failure rate in the west but not so much in the south and east.

I am not subject to Estes NDA. The Pro series ended up being released as clustered 24mm rockets.

The F62 internal geometry was an exact copy of the U. S. Rockets F40/F80. As such, one grain is an E, two an F, and three a shippable G. It appears Estes tried to get CPSC to accept G's, and when not, they were not released even though DOT and NAR certified already.

Jerry