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I am starting to look at some more exotic (for me) materials like ASA and PC. Eventually CF filled. Wondering how hard it is to swap back and forth from these to PETG or PLA on a Prusa MK3. Does anyone have printers set up and dedicated to particular materials? Does anyone recommend this, or is...

I recently used an RRC3 to airstart motors just after launch detect. When I downloaded to flight data, thee was no AUX event in the log. Airstart did occur and the RRC3 AUX Output Control was programmed correctly, but no AUX event was in the Flight Data. In other RRC3 flights using more complex...

No one will accuse me of taking decent pictures, but here are a few from Sunday... Wildman Punisher Drag Race

I flew an AT J510W for the first time last month and it made some loud chuffing sounds during the burn that gave the impression of chunks of material blocking the nozzle and then getting ejected. Is this typical; or a close call that indicates I might not have assembled the motor correctly? The...

In my Broken Arrow XP simulation the extended Barrowman method in Open Rocket moves the CP forward quite a bit when a tail cone is added. Is this realistic? With the tail cone, stability is 0.159 cal: Remove the tail cone leaving everything else unchanged, stability is 0.933 cal...

Around 1976 or 1977 I built an egg lofter kit that claimed to go super sonic on what I think was one of the Enerjet "F" motors (arrow below). Not likely that it did, as was the case with many of the day, but I am trying to figure out who made the kit. I believe the kit came packaged with the...

The Archetype cable cutter with a small drogue on the shock cord to keep the nose cone above the booster during descent has worked great for my LOC 3.90 V2 with nose cone AV bay with one exception... the main deployment times are long. In two flights, it took 8 and 15 seconds for the burrito to...

In my experience, it is very easy to remove used CTI reloads by hand, so I was surprised to have difficulty getting a used J595 Blue Streak out of its P38-6GXL case. Reprimanding myself for forgetting to grease the case threads, I went to work with vice grips on the nozzle housing and a rubber...