Conversation:

Notices

1. Joshua Judson Rosen (rozzin)'s status on Saturday, 27-Feb-2016 23:36:57 EST Joshua Judson Rosen

   • nanohacker
   • Rockets & Rocketry
   Pretty good !rocket launch w/ @nanohacker, today; chilly outside, but no problems blasting off--hooray for lithium batteries!
   • Christopher M. Hobbs, lnxw48 (Linux Walt) and j like this.
   • MMN-o ✅⃠ repeated this.
   • Joshua Judson Rosen (rozzin)'s status on Sunday, 28-Feb-2016 11:00:20 EST Joshua Judson Rosen

     • Grav-mass
     • Rockets & Rocketry
     We did a !rocket launch for !gravmass (to engage all 3 laws), and learned that alkaline #batteries don't cut it below something like 60°F ☹
     Christopher M. Hobbs likes this.
   • MMN-o ✅⃠ (mmn)'s status on Sunday, 28-Feb-2016 11:13:31 EST MMN-o ✅⃠

     Remote profile options...

     • Joshua Judson Rosen
     • Tomas SA2TMS
     ^- ping @tomas
   • Christopher M. Hobbs (cmhobbs)'s status on Sunday, 28-Feb-2016 11:19:30 EST Christopher M. Hobbs

     Remote profile options...

     • Joshua Judson Rosen
     @rozzin they don't cut it on the ground or up I'm the air?
   • Joshua Judson Rosen (rozzin)'s status on Sunday, 28-Feb-2016 11:36:48 EST Joshua Judson Rosen

     • Christopher M. Hobbs
     @cmhobbs, alkaline 9V in the launch controller failed to push enough current through the igniter wire to heat it up and ignite the BP motor.
   • Christopher M. Hobbs (cmhobbs)'s status on Sunday, 28-Feb-2016 12:01:51 EST Christopher M. Hobbs

     Remote profile options...

     • Joshua Judson Rosen
     @rozzin fascinating
   • Joshua Judson Rosen (rozzin)'s status on Sunday, 28-Feb-2016 13:44:35 EST Joshua Judson Rosen

     • Christopher M. Hobbs
     @cmhobbs, IIRC it was ~55°F for the Grav-Mass launch (unusually warm!), and the only successful ignitions were from the batteries that were still warm from having been in my pocket.
   • Joshua Judson Rosen (rozzin)'s status on Sunday, 28-Feb-2016 14:03:46 EST Joshua Judson Rosen

     • Christopher M. Hobbs
     @cmhobbs, "smoke alarm battery", by comparison, gave reliable ignition even below 40°F: https://www.ultralifecorporation.com/ecommerce/CatalogItemDetail.aspx?CID=56&IID=628
     Christopher M. Hobbs likes this.
   • Joshua Judson Rosen (rozzin)'s status on Sunday, 28-Feb-2016 14:36:12 EST Joshua Judson Rosen

     • Grav-mass
     ... so, I guess this past !gravmass ended up teaching us a little about chemistry in addition to physics ☺