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  #31  
Old 04-28-2020, 04:33 AM
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ghrocketman ghrocketman is offline
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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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  #32  
Old 04-28-2020, 05:27 AM
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Quote:
Originally Posted by ghrocketman
All my D13/D24 18mm reload paks also have 3 nozzles as well and some are 20 years old.


They always did, it was the bs and cs with1. What do the 20 year old D13s look like? Mine are swelling.
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  #33  
Old 04-28-2020, 09:38 AM
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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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ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
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  #34  
Old 04-28-2020, 08:57 PM
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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  
Old 04-28-2020, 09:28 PM
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Jerry Irvine Jerry Irvine is offline
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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
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  #36  
Old 04-28-2020, 09:34 PM
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Jerry Irvine Jerry Irvine is offline
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Quote:
Originally Posted by 5x7
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.
The fact a product you actually like sits on a shelf for 20 years tells you more about the retail and distribution scheme than the product. No wonder hobby stores are dead.
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  #37  
Old 04-29-2020, 12:59 PM
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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
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  #38  
Old 04-29-2020, 01:15 PM
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Would you like an RCRG motor that burns near 30 seconds?
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  #39  
Old 04-29-2020, 01:22 PM
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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.


Quote:
Originally Posted by Jerry Irvine
Would you like an RCRG motor that burns near 30 seconds?
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  #40  
Old 04-29-2020, 03:21 PM
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Jerry Irvine Jerry Irvine is offline
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Quote:
Originally Posted by burkefj
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.


YORF thread
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