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  #21  
Old 03-13-2014, 01:08 AM
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Sather Sather is offline
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Quote:
Originally Posted by Sather
They are cubes, about 0.6" on each side. If squished slightly, should fit inside of a BT-50.


Super Hint #1 - a BT-50 tube fin rocket WILL fit inside of a 3" body tube.
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AP used in 2010: 28,044 Ns (36.9% O)
AP used in 2011: 43,488 Ns (6.2% P)
Highest altitude achieved: 21,981' AGL

"Gravity is a cruel and unpredictable mistress"
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  #22  
Old 03-13-2014, 06:57 PM
Rex R Rex R is offline
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one can get a 4 fin rocket inside a 3" tube too...a design I've seen indicates 40g pad weight (w/o cheese). wonder what will actually be built .
Rex
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  #23  
Old 03-13-2014, 07:47 PM
Rex R Rex R is offline
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another design uses 3 fins and has a pad weight (w/o cheese) of 20g AND be launched safely using an 18" rod!
Rex
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  #24  
Old 03-14-2014, 04:46 PM
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Quote:
Originally Posted by Rex R
wonder what will actually be built .
Rex


here's one... 4" tube, wood hub holding four 36" driveway markers for legs. The whole thing gets launched upside down. The parachute attaches to the payload shroud, which comes off for launching the ascent rocket.
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__________________
AP used in 2010: 28,044 Ns (36.9% O)
AP used in 2011: 43,488 Ns (6.2% P)
Highest altitude achieved: 21,981' AGL

"Gravity is a cruel and unpredictable mistress"
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  #25  
Old 03-14-2014, 07:43 PM
Rex R Rex R is offline
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hmm 4", okay I'll guess I211 for the 'booster'
Rex
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  #26  
Old 03-14-2014, 08:19 PM
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Quote:
Originally Posted by Rex R
hmm 4", okay I'll guess I211 for the 'booster'
Rex


Not entirely sure yet, but not a bad assumption. Final weight to be determined. This part is surprisingly light so far. I'm shooting for an I161 White Lightning, with an I245 Mojave Green as a backup if the weight creeps up (likely). This should keep the altitude reasonable since it will likely have a really big chute.

P.S. The enclosed compartment under the launch rod is where my spares (igniters, tape, super glue, etc.) will be. In the actual operation, this will by default be left behind on the surface of Bong and available to others should they be "stranded". Remember, pre-positioned supplies will likely be part of any Mars missions.
__________________
AP used in 2010: 28,044 Ns (36.9% O)
AP used in 2011: 43,488 Ns (6.2% P)
Highest altitude achieved: 21,981' AGL

"Gravity is a cruel and unpredictable mistress"

Last edited by Sather : 03-14-2014 at 08:48 PM.
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  #27  
Old 04-22-2014, 10:55 AM
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Just finishing the fins of the 4" version. The 3" version is several sequences behind to allow improvements / lessons learned from the former to be incorporated. (Weight is the critical issue with the 3", as I am trying to fly it with Level 0 motors. On the 4", I can just pile on Newtons to make up for my lack of building skills. Vmax is my friend.)
__________________
AP used in 2010: 28,044 Ns (36.9% O)
AP used in 2011: 43,488 Ns (6.2% P)
Highest altitude achieved: 21,981' AGL

"Gravity is a cruel and unpredictable mistress"
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  #28  
Old 04-22-2014, 11:48 AM
Rex R Rex R is offline
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depron + cardstock makes for lightweight rockets .
Rex
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  #29  
Old 04-22-2014, 12:03 PM
Rex R Rex R is offline
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I will also note that one can get 3" dia. tubes from Estes in approx. 3 days .
Rex
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  #30  
Old 05-26-2014, 02:45 AM
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T minus 26 days and counting...
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AP used in 2010: 28,044 Ns (36.9% O)
AP used in 2011: 43,488 Ns (6.2% P)
Highest altitude achieved: 21,981' AGL

"Gravity is a cruel and unpredictable mistress"
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