NASA still uses the 4 fin 2.75" w/ 18Lb head & a 5 min flare for the open sight operator in their sounding rocket program as Test rockets to link C Band & Telemetry prior to sounding rocket launches.
Bristol Aerospace in MB,CDN supplied a couple rocket motors-Black Brant & Nihka depending on NASA vehicle/payload configuration(s)
I've loaded/launched/witnessed several hundred.
2.75" test rockets were launched @
85deg az
I don't recall apogee
distance was 4000+ meters to impact
The 18Lb steel heads were never recovered
The aluminum rocket tube would splay out like a banana peel upon impact.
