Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Swap Shoppe > Wanted: Dead or Alive!
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #31  
Old 04-28-2020, 05:33 AM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Michigan
Posts: 10,651
Default

All my D13/D24 18mm reload paks also have 3 nozzles as well and some are 20 years old.
__________________
When in doubt, WHACK the GAS and DITCH the brake !!!
No DIRECT and MEASURABLE Harm=NO Foul advocate


Yes, there is such a thing as NORMAL
, if you have to ask, you probably aren't
!
Reply With Quote
  #32  
Old 04-28-2020, 06:27 AM
5x7's Avatar
5x7 5x7 is offline
Sometimes collector
 
Join Date: May 2008
Posts: 1,102
Default

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.
Reply With Quote
  #33  
Old 04-28-2020, 10:38 AM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Michigan
Posts: 10,651
Default

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.
__________________
When in doubt, WHACK the GAS and DITCH the brake !!!
No DIRECT and MEASURABLE Harm=NO Foul advocate


Yes, there is such a thing as NORMAL
, if you have to ask, you probably aren't
!
Reply With Quote
  #34  
Old 04-28-2020, 09:57 PM
5x7's Avatar
5x7 5x7 is offline
Sometimes collector
 
Join Date: May 2008
Posts: 1,102
Default

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.
Reply With Quote
  #35  
Old 04-28-2020, 10:28 PM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
 
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,785
Default

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
Reply With Quote
  #36  
Old 04-28-2020, 10:34 PM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
 
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,785
Default

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.
Reply With Quote
  #37  
Old 04-29-2020, 01:59 PM
burkefj's Avatar
burkefj burkefj is offline
Craftsman
 
Join Date: Feb 2009
Posts: 367
Default

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
__________________
RC Rocket glider kits
www.dynasoarrocketry.com
Reply With Quote
  #38  
Old 04-29-2020, 02:15 PM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
 
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,785
Default

Would you like an RCRG motor that burns near 30 seconds?
Reply With Quote
  #39  
Old 04-29-2020, 02:22 PM
burkefj's Avatar
burkefj burkefj is offline
Craftsman
 
Join Date: Feb 2009
Posts: 367
Default

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?
__________________
RC Rocket glider kits
www.dynasoarrocketry.com
Reply With Quote
  #40  
Old 04-29-2020, 04:21 PM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
 
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,785
Default

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
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 07:42 PM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2020