Nuri's fifth flight gives CubeSat customers a 90% deployment rate from a sample of one

Ten satellites on one flight is a small sample, and the 90% ^[15] is a count more than a rate. Take a hypothetical launcher that deploys 80% of its CubeSats: it would still put nine or more of ten into orbit about 38% of the time, from 10 x 0.8^9 x 0.2 (0.268) plus 0.8^10 (0.107) ^[16]. That treats every satellite as an independent draw, and a single cause behind the miss would break the assumption. The agencies did not say why Persat02 failed to deploy ^[2], how long contact took on the fourth launch, or what any CubeSat customer paid.

The better evidence for the rocket is orbital placement, and the sources give it as speed of contact. Oh Tae-seok, head of the Korea AeroSpace Administration, said the agency made contact with the cube satellites in "far less time than during the fourth launch" ^[4]. He gave the reason: "This was achieved because the launch vehicle placed the satellites into their target orbits more precisely and provided more accurate satellite position data, which means our technical maturity has risen another notch." ^[5] The last of the six two-way contacts, DaejeonSat-1, came about 11 p.m. on the 8th, roughly 34.5 hours after liftoff ^[18], and JAC-007 returned a beacon on its first attempt and later completed a data downlink ^[11]. The comparison with the fourth launch is the administrator's own, made by the agency that launched the rocket ^[6].

The CubeSats rode as secondary payloads ^[7], so the commercial question sits behind a policy one. An Hyoung-joon, head of the space and public-sector team at the Science and Technology Policy Institute, said that connecting Nuri's success to commercialization requires a Korean-style space transportation industrial policy, one that sits between leaving it to the market and having the government develop launch vehicles itself, and that combines long-term public procurement with competitive support for the private sector ^[14]. Procurement of that kind commits public money for years, and the deployment evidence in these two reports is one flight and ten CubeSats ^[1].

In our view the flight shows Nuri can deliver secondary payloads, and one flight cannot show it does so reliably. Other readings are open. If Persat02's failure traces to the satellite, the rocket's own count is ten of ten. If it traces to the rocket, 90% is a real miss. If the fourth-flight comparison holds, the trend matters more than either figure. We would be wrong if the sixth launch releases every secondary payload it carries and contact times keep falling.