Maximum range is calculated very easy:
Attention!
This is not a real distance - this is only algorithm for calculation.
Sorry, but I do not know the location daraya cameraman:
Old Soviet Grad 122 mm rocket М-21ОФ (9М22) in OpenRocket (20 km):
Umlaca with big Grad engine:
2.4 km, 31 s.
Umlaka had a bad engine to fly only 20 seconds.
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