So the BA-330 was aimed at the EELV launch market, with a mass of some 25 tons.There is model of a BA-2100 aimed at the SLS market, with a mass of some 100 tons.What would a Bigelow for Falcon Heavy look like? Broadly speaking, double all dimensions and you quadruple the mass and increase the volume 8 fold (less a little to account for stronger walls. So that implies a Bigelow 900 for Falcon Heavy. This could support 12 to 18 crew. It would need to fit inside the FH fairing - which might go up to 6m?A second flight could take a segmented heat shield solar panels and other external gear. Could it be suitable for Mars Aerocapture?
A 6m fairing on the 3.66m core might pose stability problems. Does anyone know the fairing-to-core ratio on the hammerhead ELVs?
FH puts a 25 ton Bigelow module in lunar or Mars orbit, not just injection trajectory.
FH puts a 25 ton Bigelow module in lunar or Mars orbit, not just injection trajectory. Can you say Phobos Base and L1 solar sat construction shack??
Quote from: mlorrey on 04/10/2011 10:26 pmFH puts a 25 ton Bigelow module in lunar or Mars orbit, not just injection trajectory.No.
Quote from: ugordan on 04/10/2011 10:30 pmQuote from: mlorrey on 04/10/2011 10:26 pmFH puts a 25 ton Bigelow module in lunar or Mars orbit, not just injection trajectory.No.Agreed, won't even put that much through TLI.cheers, Martin
Wall mass is proportional to volume.
Quote from: MP99 on 04/11/2011 12:27 amQuote from: ugordan on 04/10/2011 10:30 pmQuote from: mlorrey on 04/10/2011 10:26 pmFH puts a 25 ton Bigelow module in lunar or Mars orbit, not just injection trajectory.No.Agreed, won't even put that much through TLI.cheers, MartinYou havent watched the video then. Elon stated: Falcon Heavy puts 35 tons in TLI.
The Engineer in Progress blog has some interesting speculations about the kg/m3 of Bigelow modules, basically 45-60 kg/m3. For 50 mT to LEO that gives - 45: 1,110 m350: 1,000 m355: 909 m360: 833 m3Give it a read....
Quote from: tnphysics on 04/11/2011 12:21 amWall mass is proportional to volume. Why would it be? Wall thickness and composition is partially determined by penetration resistance, which wouldn't change with volume.
What if falcon heavy does not meet it's performance goals? With a smaller module you just put in less provisions to compensate. With a module using exactly the performance you're screwed.
Quote from: Nomadd on 04/11/2011 12:34 amQuote from: tnphysics on 04/11/2011 12:21 amWall mass is proportional to volume. Why would it be? Wall thickness and composition is partially determined by penetration resistance, which wouldn't change with volume. Predominantly determined by penetration resistance.A small part of the wall thickness is determined by pressure, so thickness of this scales with diameter, and hence mass scales with volume. However, this is a few mm only. It will only dominate where D > 100m.For Bigelow modules, wall mass should be mostly a square function, not a cube function.