Rocketarium Flying Model Rocket Kit KSR-420S Sounding Rocket  RK-KS420

Rocketarium Flying Model Rocket Kit KSR-420S Sounding Rocket 3 Motor Cluster RK-1022

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Skill Level:
2 Intermediate
Motor Mount Size:

Rocketarium KSR-420S Sounding Rocket

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  As a skill level 2 kit, the KSR-420S is easy to build. This makes it a great choice for rocketeers new to clustering.


Overall length : 27.475"

Diameter : 1.637" (BT60)

Fin Span : 6.21"

Weight : 3.7oz

Recommended Motors

Estes® 3 x A8-3, 3 x B4-4, 3 x C6-5

Challenges:  This rocket is pretty easy to build. The balsa fins are pre-cut.

Self-adhesive decals are cut from the included decal sheet.  The red fin and nose cone are painted, all other markings/bands are decals.

Parts:  A laser-cut centering ring with 3 holes is provided to prevent ejection gasses from blowing out the back..

Model Rocket Kits are rated by Skill Level

1 Beginner

2 Intermediate

3 Advanced

4 Expert

5 Master

If you are just starting in the hobby start at the beginner level and move up from there at your own pace.

What is needed to build and fly

All model rockets come in kit form that require assembly.  The materials are primarily cardboard tubes, balsa or plastic fins and nose cone.  Materials will vary by model and are typically specified in the description of each kit. 

Additional supplies will be necessary to build and finish your model rocket kit and may include:

Scissors, Hobby Knife


Wood Glue, Model Cement or CA(Super Glue)


Masking Tape

Finishing Supplies like:

Wood Filler



Launching Equipment and Supplies like:

Recovery wadding

Launch Pad

Launch Controller

Power supply

Model Rocket Motors and Igniters

A safe place to fly using guidelines from the National Association of Rocketry Safety Code