#31
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All my D13/D24 18mm reload paks also have 3 nozzles as well and some are 20 years old.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
#32
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They always did, it was the bs and cs with1. What do the 20 year old D13s look like? Mine are swelling. |
#33
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I'll have to dig out the old D13s to look.
I have far more D24s as I prefer the big kick of BT propellant in 18, 24, and 29mm flavors. BT ages well and does not swell. Wish we could get their Mohave Green propellant in some 18mm and 24mm loads.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
#34
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I have used BT reloads from 1995 with no issues. I think they will last a long time. For some reason a hobby shop I visited a lot got around 50 packs of F39s around 1995, I think they thought they would be huge sellers. Folks from our club would buy a few packs here and there for the next 20 years. When they closed shop 20 years later they still had 15 packs which I got at a good discount. They burn great, good thing I love that motor.
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#35
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AT WL uses Mg as the metal which reacts with air and it also migrates through the first couple layers of AP and rubber. It swells. The reason why Erroretch uses Mg is it combusts more fully in small motors. It ages poorly. The alternative technology we use at U.S. Rockets is low micron Al. On the order of 6-8 micron. It ages 40+ years.
Last I checked AT BT uses copper chromite which does not age quite as badly. Tech Jerry |
#36
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#37
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I had an alternate experience, I just flew 8 BT G-12 endburners, sealed from 1995-96
The propellent was quite hard, no swelling, all ignited normally, one burned normally, 7-8 second burn, one burned in 3 seconds, I have a video, it's like it got kicked in the ass about 6 feet up(Karl at Aerotech thinks the propellend might have pulled away from the casting tube and burned on end and side when I showed to him), the rest burned with much reduced power, in about 12 seconds. I also flew two F-16 WL's sealed from the same time, both were swelled, even with scraping the surface they chuffed badly and developed very low thrust and burned for 20 seconds, fortunately this was in an RC rocket glider and I could deal with the low thrust and steer it level with no damage. As Jerry said these don't age well. Frank |
#38
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Would you like an RCRG motor that burns near 30 seconds?
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#39
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I don't know, what is the weight before and after burn, is it certified for use at AMA fields which required NAR or Tripoli commercial certified motors.
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#40
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YORF thread |
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