Nice! Hard to tell as I was running the video in a small window.Those are phenolic 7.5" tubes, but @tjsnakez and I did each get one of those 5" tubes!
Nice! Hard to tell as I was running the video in a small window.Those are phenolic 7.5" tubes, but @tjsnakez and I did each get one of those 5" tubes!
In this particular case (pardon the pun), he was testing to see if JBWeld was strong enough to survive mach, and also testing some of the other properties (e.g. is it strong enough to handle the heat of being attached directly to the motor as it burns without losing strength).Interesting, but I don't understand the point of the "flying case" when you add a regular diameter airframe tube and nose cone to the top of it. OK, you save some weight without a full-length airframe and maybe a minute amount of friction drag. Pressure drag may be same or worse than a normal build due to the transition. However, top speed and/or altitude were seemingly not your goals. Plus, all that work into a disposable rocket...ugh. What's the appeal?
Truthfully, my original plan was to use a piece of coupler and trim a nosecone to effectively create a true "minimum diameter" build. However, I decided to hold off for the time being on that concept.Interesting, but I don't understand the point of the "flying case" when you add a regular diameter airframe tube and nose cone to the top of it. OK, you save some weight without a full-length airframe and maybe a minute amount of friction drag. Pressure drag may be same or worse than a normal build due to the transition. However, top speed and/or altitude were seemingly not your goals. Plus, all that work into a disposable rocket...ugh. What's the appeal?
Full disclosure, I did not compress these charges like I do with a lot of mine because I was trying to keep them small and save as much space as possible. My thought is that the altitude combined with the compression only coming from the strength of a nitrile glove (rather than a tight wrap of electrical tape like I usually do) resulted in more of the powder being thrown around than burned.I’m confused with what happened. The charges blew.
I saw a great idea with a lightweight cable cutting pyro that @waltr put on his two stagerThe next steps in my quest for high-altitude stuff definitely include a priority in a more efficient ejection charge assembly.
You might want to look into even tighter containment than electrical tape just to be extra sure. Some use charge vials or cardboard tubes with glue/tape, and I’ve been trying out Tony Alcocer’s vinyl charges outlined here. They should work at any altitude, and I’m planning on using them in nearly all my DD flights even if it’s overkill. I bet 1/4” vinyl tubing would work perfect for this type bird. YMMV!Full disclosure, I did not compress these charges like I do with a lot of mine because I was trying to keep them small and save as much space as possible. My thought is that the altitude combined with the compression only coming from the strength of a nitrile glove (rather than a tight wrap of electrical tape like I usually do) resulted in more of the powder being thrown around than burned.
The next steps in my quest for high-altitude stuff definitely include a priority in a more efficient ejection charge assembly.
I had a chat with Tony about his ejection charges at BALLS. I just let it get in my head that 20,000 feet "wasn't that high" and that these charges would suffice.You might want to look into even tighter containment than electrical tape just to be extra sure. Some use charge vials or cardboard tubes with glue/tape, and I’ve been trying out Tony Alcocer’s vinyl charges outlined here. They should work at any altitude, and I’m planning on using them in nearly all my DD flights even if it’s overkill. I bet 1/4” vinyl tubing would work perfect for this type bird. YMMV!
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