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I can guarantee you that between GLR, Wildman, and Joe from Hobbytown that you can find 3 H128 reloads. That won’t be the issue.As for hooking up?I’m the overenthusiastic 16 year old that shows up saturday at between 8:00 AM…   Read more»

OK. Here’s what I did. Had some leftover things from a furniture project long ago. Don’t know what they are called, but they screw into wood (large deep threads on the OD) and have 10/24 threads ID. Drilled a proper…   Read more»

Didn’t understand the central coupler until now. Great idea, but I used the center of the last (highest) clustering ring for the shock cord. Should be able to make it work though if the tube clamps aren’t a good idea.The…   Read more»

Sure hope the RSO is watching out for this one. Should be fine, at least in my understanding of what you’re doing. Lofting is easy, recovery isn’t. See you on the range.

When I was a kid (more years ago than I want to admit) we used to launch home built rockets with Estes motors and cannon fuse and no launch rods – didn’t know anything about CG and CP. Fortunately my…   Read more»

Didn’t understand the central coupler until now. Great idea, but I used the center of the last (highest) clustering ring for the shock cord. Should be able to make it work though if the tube clamps aren’t a good idea.

That seems fine, and DEFINITELY, do not friction fit.

I wa concerned about the friction fit with the larger motors. I thought that a small tube clamp on each engine tube might work (after slotting to allow for the compression of the tube). I don’t plan on launching this…   Read more»

xman.The jrs will work and are less money. Wildman also sells some good stuff at about 2 bucks per. I think we got you covered, don’t forget the paperwork and even with the relatively mild H’s you’re using, its really,…   Read more»

10 bucks for a pack of three FirstFires at HT in Longmont.

That was the last time I saw them – not sure where. I’ll never use them again though, unless they came with the motor. Quickbursts work as well or better for $1 each. (about $1.50 each for the K and…   Read more»

Chris,where was that? I like firstfires but last paid 6/3.Not quite designed to fail. more like no room or error……….J

Yeah – no kidding. As for the designed to fail? I wouldn’t go that far, but they’re certainly overpriced. $9 for a 3-pack of firstfires? Give me a break

Warren.I’m getting a tighter read on things, but haven’t sampled the universe. The magnelite igniters which i use for the most part use 4-5 coils of nichrome bridge, the resistance is 1.2 +/- 0.3 Ohms. When I bothered with such,…   Read more»

Typical HPR igniter resistances I’ve measured range in the 1.5 to 5 Ohm range. This includes nichrome based as well as carbon fiber/nitrocellulose pyrogen as in the Igniterman kit.Warren

All I am assuming is that their resistance characteristics are similar. I know that they break when fired(I have tested that), and I know the resistance is generally significantly lower, but if anything that would seem to make them less…   Read more»

Never tried it with HPR igniters, but it should work the same way as the estes.I would never make that assumption and I rarely use the word never. If there is one thing I’ve learned it is that what works…   Read more»

I have never seen one in a rocket that failed this way. I tried 3 estes igniters in series, however, and 2 lit, one did not. I then tested the one to make sure it was good – it worked…   Read more»

Chris,But how many series clusters do you personally know of where the circuit was broken? None I bet. How many anecdotal cases. maybe one? The problem is much more complicated than an ee 101 class. You have the rise time…   Read more»

Assuming I do try and cert with H motors, other than the casings and reloads what else do I need?