Slack Pete's Rockets Motor Retaining Rings.
One of the most successful of our products are the Slack Pete's Rockets motor retaining rings. Now used by many UK rocketeers, the motor retaining rings were designed back in 1997. The idea of the motor retaining rings came about, when Slack Pete Davy lost a 38mm diameter motor casing at a High Power Rocketry launch event, when it was forced out of the rocket at motor ejection.
There are 3 sizes of motor retaining rings; a 29mm diameter ring, a 38mm diameter ring and a 54mm diameter ring, each sized to fit an airframe/body/motor tube of the same diameter. The rings can also be flush fitted into suitably sized boattails
Each of the rings can also be fitted within the other, so a 29mm diameter motor retaining ring can be fitted within a 38mm diameter motor retaining ring, which in turn, can be fitted within a 54mm diameter motor retaining ring.
The rings consist of two parts; an anodised aluminium mount with a screw thread which is fitted to the motor/airframe/body tube with epoxy resin, and an anodised aluminium retaining ring (also with a screw thread) and a knurled grip, which is screwed onto the mount after the motor has been slid into the motor tube.
N.B. Before fitting the motor retaining ring to the motor tube, it is advisable to roughen up the surface of the tube to ensure a good surface for the epoxy resin to bind to. Additionally, a 10mm length of the tube can be sanded if the fit of the motor retaining ring is tight, to enable the motor retaining ring to fit better.
