Canadian Rocket Store


KSR-420S Cluster (3) Model Rocket [RK-1022]


KSR-420S Cluster (3) Model Rocket

In Stock. Ships Apr 22

  • Cluster Rocket. Uses A, B or C Estes Motors
  • Ejection Baffle (no wadding required)
  • Comes with plastic parachute kit.
  • The balsa fins are pre-cut. Self-adhesive decals are cut from the included decal sheet.
  • Over 27" Tall
  • Basic Assembly Skills Required

Recommended Engines (apogee ft):

3 x A8-3 (275) , 3 x B4-4 (600) , 3 x B6-4 (610) , 3 x C6-5 (1200)


  • Length: 27.5" (70 cm)
  • Diameter: 1.64" (42 mm)
  • Weight: 5.6 oz. (162 g)


This Korean sounding rocket was used to gather data on ozone concentration over the Korean peninsula. The KSR-420S also carried a highly-specialized device to measure micro gravity. In somewhat less peaceful times, the KSR-420S could be modified to carry a 200kg destructive payload over a considerable distance.

This sport-scale model of the KSR-420S flies on a cluster of three 18mm model rocket motors. The KSR-420S is easy to build. This makes it a great choice for rocketeers new to clustering.


  • Manufactured by: Rocketarium