#11
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Now this is a huge step up for contemporary BP engines!
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#12
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What body tubes are available for the 15mm and 10mm motors? These look like they could generate some interesting models. Something I thought about as a possible sideline item -- Pre-packaged deployment charges (not delay chains) for use with electronic triggers, each with specific amounts of pyro, and with two firing ports (one at each end) for redundancy triggering. Not exactly what we'd be using with our smaller models, but possibly for some of those upper-end 29mm birds... I see the DECAPs used for the 13mm and 10mm motors, but can this be adapted for the 18mm as well? Or does the pressure generated in the 18mm package exceed the limits for whatever adhesive/mechanical fixatives will be used?
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#13
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The 13mm DECAP (for 18mm standard engines) will probably be the one we do. If it is popular, we might add the 10mm. One of the primary advantages of the DECAP is precision times. The accuracy of a standard engine is only as accurate as how much of the propellant "runs" up around the ram. The DECAP eliminates this variable. Another advantage is the ability to pick in-between times for models that don't fit the 2 second spread.
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Carl McLawhorn NAR#4717 L2 semroc.com |
#14
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Now I understand. Thanks. One presumes the "ejection-only DECAP" can be fired with an igniter, not just as part of a motor assembly?
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#15
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One of the first things I did when stumbling back into the hobby in 2001 was buy a bunch of Apogee cones, rings and tubes. Somewhere in my shop I've got a mess of 10mm tubing that was part of the deal. I was all excited when I got the tubes, but he almost immediately ditched the 10mm motor line, so my excitement was short-lived. Guess I have to dig again.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle In paint: Canaroc - Starfighter Scorpion Centuri - Mini Dactyl Estes - F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II, Xarconian Cruiser Semroc - Cyber III Ready to fly: Estes - Solar Sailer II Semroc - Earmark |
#16
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Carl McLawhorn NAR#4717 L2 semroc.com |
#17
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Is that what those tubes were? I've got a bunch myself, from the same source. I think I bought at least two bags of tubes a few years ago, before I knew about SEMROC or even BMS. I may have to look at these tubes again for future BARCLONE projects. They might be useful in some smaller "Schoolyard Sounders"... For Carl: Those Apogee bags were likely filled with Euclid's tubes, so they may still have the mandrels for making them. The last time I checked the Apogee site, like Bill said, I think those tubes had been dropped from the packs (TVM has dropped them; I just looked), but they've been replaced with 29mm tubes.
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#18
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What will be the minimum delay tick? 1 Second or 1/2 Second intervals?
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#19
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Planned is 1 second to keep inventory down.
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Carl McLawhorn NAR#4717 L2 semroc.com |
#20
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We will probably get a slightly smaller BT-4 (.410"ID/.436"OD).
Tim's micros were 10.5mm. We wanted ours to be as small as possible within FAI limits.
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Carl McLawhorn NAR#4717 L2 semroc.com |
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