UKRA Safe Distance Tables

The next largest distance in the table must be used where any of the following conditions are
met:

  • The flight involves a boosted glider or winged recovery.
  • The flight is considered Research or Experimental.


At the RSO’s discretion the minimum safe distance may be reduced for those required to
facilitate the launch of the rocket providing that:

  • Safety of the flier, spectators and the public can be assured.
  • The distance between the launch rail and anyone not directly involved in the launch is
    greater than or equal to the distances in the table below.


Total Impulse (equivalent Impulse Class) Safe Distance from launch rail
Single Motor metres (feet)
Safe Distance from launch rail
Multiple Motors metres (feet)
Up to 2.5 Ns (A) 2 (7) 3 (10)
2.5 - 10 Ns (B, C) 3 (10) 6 (20)
10 - 20 Ns (D) 5 (16) 10 (33)
20 - 40 Ns (E) 7 (23) 15 (50)
40 - 160 Ns (F, G) 10 (33) 20 (66)
160 - 320 Ns (H) 15 (49) 30 (98)
320 - 1,280 Ns (I, J) 45 (148) 60 (197)
1,280 - 2,560 Ns (K) 60 (197) 90 (295)
2,560 - 10,240 Ns (L, M) 90 (295) 150 (492)
10,240 - 40,960 Ns (N, O) 150 (492) 300 (984)