Blue Origins, update |
Blue Origins, update |
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#1
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Member ![]() ![]() ![]() Group: Members Posts: 163 Joined: 16-March 05 From: Oakville, Ontario, Canada Member No.: 201 ![]() |
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#2
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 ![]() |
With such high gravity to fight against, and a nice thick atmosphere that's screaming out for chutes, parafoils etc.... landing with rockets on Earth just doesn't make a lot of sense to me.
Doug |
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#3
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![]() Member ![]() ![]() ![]() Group: Members Posts: 593 Joined: 20-April 05 Member No.: 279 ![]() |
[L]anding with rockets on Earth just doesn't make a lot of sense to me. I agree. Using one of the fresh envelope-backs I got for Christmas, I see that retro-rocket-landing an Apollo CM from the drogue release altitude and speed, for example, would require something like a beefed-up AJ10-137 engine (massing around 4000kg), 31 seconds' thrust (1450 kg of fuel and oxidiser), all crammed into a 5800 kg mass capsule (!!). Naturally the engine would have to poke through the heat shield, which additionally complicates matters. Comparing that to the (original) 245kg parachutes-and-drogues-and-deployment package, it's an absolute no-brainer. <long pause> ...though, in its favour <whispering> it would look rather Heinleinian. ![]() Andy |
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#4
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2520 Joined: 13-September 05 Member No.: 497 ![]() |
Comparing that to the (original) 245kg parachutes-and-drogues-and-deployment package, it's an absolute no-brainer. If you're never going to use the vehicle again, absolutely. The arguments for VTVL all revolve around reusability and rapid turnaround. See, for example, http://www.thespacereview.com/article/412/1 I'm agnostic on the topic; like most engineering, there is no clear best solution. It's very dependent on the mission profile and on the logistical/economic assumptions. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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