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Last updated: Nov 11, 2000
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K & S Duration Rules

Devised by Alan Estenson
Last revised October 10, 1998

Explanation:  When MASA first formed, I thought that it would be neat to have some contests at our launches.  However, nearly all MASA members (including myself) have never participated in an official NAR competition.  So, I invented these rules for a fun, informal, slightly wacky competition that could be done at any launch.

If you walk into your local hobby store, they probably have a rack of "K&S" brand products:  steel "music" wire, brass tube, brass rod, etc.  These products are in red cardboard tubes, three feet long.  Since I work in a hobby store, I have a ready supply of these empty tubes.  My thought was:   "Why not invent a competition where you're required to build a rocket out of one of these things?"  Admittedly, the tubes are quite thick-walled and heavy, but that's all right, we're not going for high performance..  For MASA members, I can supply with a tube upon request.  For anyone else reading these rules, look to see if your local hobby store has an empty tube in its rack.  Please, ask them if its okay before you take it.

Obviously, K&S has nothing to do with this thing other than being the unwitting supplier of the primary component.

Important hint:  remove the red outer layer of the tube where fins and such are glued.  Under the rules, you have to leave it everywhere else.

The current "official" longest duration in the "C" motor class is 47 seconds (Art Gibbens, 7/26/98)
The "unofficial" longest duration in the same class is one minute, 2 seconds (Alan Estenson, 7/26/98)

A K&S "lawn dart" has a typical duration of about 11 seconds.  <grin>

All aspects of the United States Model Rocket Sporting Code (NAR "Pink" Book) apply save where abridged by this document. The NAR Safety Code shall stand in all respects. (duh!)

K&S Duration Competitions

  • Consist of a single division covering all age groups.
  • Each competing person will be allowed a maximum of two (2) flights in each category during a "formal" competition.
  • During an "informal" competition, each person is allowed to fly as many times as desired with the winner having the longest single flight of the day.
  • Timing and scoring will be performed in the manner described in the "Pink" Book.
  • All motor cases must be retained in the rocket. Failure to retain all motor casings will result in disqualification of the flight.
  • The primary component of the rocket will be a 36" red K&S tube.
    • A combined minimum length of 34" of an original K&S tube must be used in each rocket. No more than one tube (36" in length) may be used in a rocket.
    • The K&S tube must retain its original red coloration (no paint is allowed on the tube other than a clear coat.)
    • The original K&S label must remain on the tube and be visible on the finished rocket.
    • A baseline K&S tube has a weight of approximately 2.6 ounces. Therefore, no rocket in these competitions shall weigh less than 2.6 ounces (without motors).
  • The nose cone and fins may be of any style and materials allowed under the NAR Safety Code.
  • For each engine, a 3" length of BT-20 (or equivalent) tube may be used as a motor mount. This is the only type and usage of tubing allowed other than the K&S tube.
  • Paper, light cardboard, and balsa wood are permitted for such purposes as fairings, shrouds, adapters, boat-tails, fins, centering rings, decoration, etc. These materials may not be used to form body tube segments. (A body tube segment is defined as a cylinder of approximately constant radius that is more than 0.5" in length.)

"C" Motor Class, Single Motor, Single Stage, Duration

  • Any number and size of parachutes permitted.
  • Any number and size of streamers permitted. (As limited by the following statements.)
  • (Excerpt from 31.2) A streamer is defined for this event as a piece of cloth, plastic film, or paper, whose shape is approximately rectangular. The streamer must have a length-to-width ratio of five to one (5:1) or greater The streamer and model must be connected by only a single line or cord, attached at the narrow end of the streamer. The cord may not be connected to either the streamer or the model at more than one point.. The streamer may not be cut, slit, or otherwise altered in such a manner as to affect its nature as a simple connected plane.
  • Maximum rocket weight (without motor) of six (6) ounces.

"B" Motor Class, Clustered, Staged, Duration

  • Parachute and streamer regulations shall be identical to those described in the single motor class.
  • The model shall have a minimum of two (2) motors and a maximum of six (6) motors.
  • If the model is staged, each stage must have a minimum of two (2) motors.
  • No model shall have more than three (3) stages.
  • (23.6) Air start of motors using any safe method is specifically permitted. A model igniting one or more motors which serve to ignite an additional motor or motors is permitted.
  • (23.7) Models that do not ignite all motors in flight will be considered official flights. An entry which fails to ignite all of its motors is considered a qualified flight unless it is unsafe, experiences a catastrophic failure, or is lost to sight.
  • Maximum rocket weight (without motor) of twelve (12) ounces.