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 | | Class Total Impulse A 0 to 2,5 Newton Seconds (NS) B 2,51 to 5,00 NS C 5,01 to 10,00 NS D 10,01 to 20,00 NS E 20,01 to 40,00 NS F 40,01 to 80,00 NS A model rocket engine casing shall be made of non-metallic material of low thermal conductivity. |
 | | In this competition, a parachute recovery device on the booster portion of the model will not be considered to be a supporting aerodynamic surface, but parachutes may be used to effect recovery of other portions of the entry. |
 | | The purpose of the competition is to determine which model achieves the longest time of flight utilising a vertical or near vertical free-ballistic flight pattern under power within a 60 degree cone centred vertically on the launcher and a stable aerodynamic glide recovery. |
| www.spacemodeling.org /sportcode4d.html (6470 words) |
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