Attached is the M5 data you're probably thinking about. It shows a weld line running the length of the motor tube between the welds at the top and bottom flanges. The apparent lack of that weld line in a lot of photos makes me wonder if there was a version that used a smooth tube. And for that matter, while those drawings mention several variations (some noted 'M5 only') I'm wondering what the physical differences might be between the M5, and M5E1 (or any other variations that I haven't heard of)[note below M88]. The meatball site mentions that the nozzle is a cone (unlike these drawings), but I wonder if that only refers to the exit cone? [The CAD rendering there makes it pretty clear.]
View attachment 336688
Somewhere I think I've read (perhaps meatball) that the IS with the corner slots is a training round.
Anyway, there is a slim chance I might get to make a road trip next month, and I might be able to plan White Sands on the way back to see the NH there. And the San Francisco SF-88 site isn't so far away, so I might be able to swing a trip there this summer.
Ok, interesting just googled and found a doc with some info
https://everyspec.com/MIL-SPECS/MIL-SPECS-MIL-R/download.php?spec=MIL-R-46468A.049412.pdf
Says this under 'Definitions'
Type I (M5) to be used for Nike-Ajax only... cannot be used for NH
Type II (M5E1) either NA or NH (meatball site says main difference between M5 and M5E1 is extra holes in the flanges)
Type III (M88) NH only ... cannot be used for NA
I guess a lot of my questions are answered by re-reading
https://meatballrocketry.com/nike-motor-data/ where there is a neat TurboCAD rendering of an M5E1 (that shows some holes and nozzle detail not shown elsewhere [like to get the CAD data].
Hey, just ran across three plates of NH drawings in Russian at this site:
https://modelist-konstruktor.com/bronekollekcziya/gerkules-groza-raket These may be the drawings that were on the Dorffler disk. I'm comparing drawings to see of there is any new or different measurements there. I notice that the Silverleaf drawings do specify a MIM-14B, and so do the Russian drawings.