Check the listing for details. Rocketarium KSR-420S Cluster (3) Model Rocket 1022. Condition: New. Listed at 30.95 USD. Skill Level: Basic Assembly 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. Specifications Length: 27.5" (70 cm) Diameter: 1.64" (42 mm) Estimated Weigh: 5.6 oz. (162 g) Requires Assembly Motor, Igniter Launch System Maxi Launch Rod Carpenter’s glue Sandpaper Utility or Hobby Knife Masking Tape (optional) Primer (optional) & Paint Recommended Engines (apogee ft): 3 x A8-3 (275) , 3 x B4-4 (600) , 3 x B6-4 (610) , 3 x C6-5 (1200) Shipping: We combine shipping. Add more items from our store and combined shipping will apply automatically. Most orders will be delivered within 5 to 7 business days. Order are shipped on the 2nd business day (Monday - Friday) if order is placed before 2PM ET. Orders placed after 2PM will be processed on the next business day and will therefore take one more day.