To our members:
The National Association of Rocketry’s Standards & Testing and Tripoli Rocketry Association’s Tripoli Motor Testing Chairmen are hereby enacting temporary Safety restriction for all Cesaroni Technology, Inc. Vmax reload motors equipped with delay charges.
We have both seen a growing number of Vmax flights using delay-only recovery coming in ballistic at our flying fields, due to delay snuffing. It is believed that delay snuffing is likely a result of any extremely high burn rate motor completing its burn with a significant drop in pressure and/or temperature, breaking the burn ‘chain’, extinguishing or ‘snuffing’ the delay slug.
In light of the unpredictable Vmax delay performance and the resulting significant safety issues, we will now require all Vmax motor flights flown at NAR and Tripoli launch sites to have at least one electronic system installed for primary recovery. These electronics need to be able to handle the short G period of these motors to insure “Flight in progress” triggers. The safety restriction will be lifted when the manufacturer has provided documentation to the three motor certification committee chairs which includes the root cause analysis, the corresponding design changes undertaken by the manufacturer to address the issue, and has implemented the necessary changes.
Any questions about this restriction may be sent to your respective organization’s motor test chair.
Ted Cochran, NAR President
John W Lyngdal, NAR Standards and Testing Committee
Steve Lubliner, NAR Safety Committee Chairman
Paul Holmes, Tripoli Motor Testing Chairman
Deb Koloms, Tripoli President