Today we received the Martlet 1 centering rings from our machining sponsor, Cambridge Precision. The rings are turned from Nylon 6/6. The first sets of rings are to centre the rocket motors in the motor sections. The rings also have 3 radial holes to locate the fins into, and one axial hole for a wiring tunnel, to allow wires from in front of the motor to go to the igniters.
The second set of centering rings is for the parachute sections. The large hole in the centre is for a cardboard tube that stows the two parachutes. This is because the parachutes are ejected through an orifice that is narrower than the rocket diameter. The parachutes are therefore stored in a tube of the ejection diameter, as the parachute pack could jam if it went through a contraction. The rings have various axial holes for wiring tunnels, and slots for lightweighting.
The rings are exactly how we designed them, thanks CP !