|
Reader's Favorites
Media Casualties Mount Administration Split On Europe Invasion Administration In Crisis Over Burgeoning Quagmire Congress Concerned About Diversion From War On Japan Pot, Kettle On Line Two... Allies Seize Paris The Natural Gore Book Sales Tank, Supporters Claim Unfair Tactics Satan Files Lack Of Defamation Suit Why This Blog Bores People With Space Stuff A New Beginning My Hit Parade
Instapundit (Glenn Reynolds) Tim Blair James Lileks Bleats Virginia Postrel Kausfiles Winds Of Change (Joe Katzman) Little Green Footballs (Charles Johnson) Samizdata Eject Eject Eject (Bill Whittle) Space Alan Boyle (MSNBC) Space Politics (Jeff Foust) Space Transport News (Clark Lindsey) NASA Watch NASA Space Flight Hobby Space A Voyage To Arcturus (Jay Manifold) Dispatches From The Final Frontier (Michael Belfiore) Personal Spaceflight (Jeff Foust) Mars Blog The Flame Trench (Florida Today) Space Cynic Rocket Forge (Michael Mealing) COTS Watch (Michael Mealing) Curmudgeon's Corner (Mark Whittington) Selenian Boondocks Tales of the Heliosphere Out Of The Cradle Space For Commerce (Brian Dunbar) True Anomaly Kevin Parkin The Speculist (Phil Bowermaster) Spacecraft (Chris Hall) Space Pragmatism (Dan Schrimpsher) Eternal Golden Braid (Fred Kiesche) Carried Away (Dan Schmelzer) Laughing Wolf (C. Blake Powers) Chair Force Engineer (Air Force Procurement) Spacearium Saturn Follies JesusPhreaks (Scott Bell) Science
Nanobot (Howard Lovy) Lagniappe (Derek Lowe) Geek Press (Paul Hsieh) Gene Expression Carl Zimmer Redwood Dragon (Dave Trowbridge) Charles Murtaugh Turned Up To Eleven (Paul Orwin) Cowlix (Wes Cowley) Quark Soup (Dave Appell) Economics/Finance
Assymetrical Information (Jane Galt and Mindles H. Dreck) Marginal Revolution (Tyler Cowen et al) Man Without Qualities (Robert Musil) Knowledge Problem (Lynne Kiesling) Journoblogs The Ombudsgod Cut On The Bias (Susanna Cornett) Joanne Jacobs The Funny Pages
Cox & Forkum Day By Day Iowahawk Happy Fun Pundit Jim Treacher IMAO The Onion Amish Tech Support (Lawrence Simon) Scrapple Face (Scott Ott) Regular Reading
Quasipundit (Adragna & Vehrs) England's Sword (Iain Murray) Daily Pundit (Bill Quick) Pejman Pundit Daimnation! (Damian Penny) Aspara Girl Flit Z+ Blog (Andrew Zolli) Matt Welch Ken Layne The Kolkata Libertarian Midwest Conservative Journal Protein Wisdom (Jeff Goldstein et al) Dean's World (Dean Esmay) Yippee-Ki-Yay (Kevin McGehee) Vodka Pundit Richard Bennett Spleenville (Andrea Harris) Random Jottings (John Weidner) Natalie Solent On the Third Hand (Kathy Kinsley, Bellicose Woman) Patrick Ruffini Inappropriate Response (Moira Breen) Jerry Pournelle Other Worthy Weblogs
Ain't No Bad Dude (Brian Linse) Airstrip One A libertarian reads the papers Andrew Olmsted Anna Franco Review Ben Kepple's Daily Rant Bjorn Staerk Bitter Girl Catallaxy Files Dawson.com Dodgeblog Dropscan (Shiloh Bucher) End the War on Freedom Fevered Rants Fredrik Norman Heretical Ideas Ideas etc Insolvent Republic of Blogistan James Reuben Haney Libertarian Rant Matthew Edgar Mind over what matters Muslimpundit Page Fault Interrupt Photodude Privacy Digest Quare Rantburg Recovering Liberal Sand In The Gears(Anthony Woodlief) Sgt. Stryker The Blogs of War The Fly Bottle The Illuminated Donkey Unqualified Offerings What she really thinks Where HipHop & Libertarianism Meet Zem : blog Space Policy Links
Space Future The Space Review The Space Show Space Frontier Foundation Space Policy Digest BBS AWOL
USS Clueless (Steven Den Beste) Media Minder Unremitting Verse (Will Warren) World View (Brink Lindsay) The Last Page More Than Zero (Andrew Hofer) Pathetic Earthlings (Andrew Lloyd) Spaceship Summer (Derek Lyons) The New Space Age (Rob Wilson) Rocketman (Mark Oakley) Mazoo Site designed by Powered by Movable Type |
"You Can't Oversell It" While reading Michael Belfiore's new book this weekend, I was struck by Brian Binnie's description of his X-Prize winning flight. Well, Jeff Foust has a report on a speech that Brian gave this past weekend, on what an amazing experience it will be. And if you can't oversell it, it makes it a double shame that Rocketplane may not be able to sell it at all. Posted by Rand Simberg at July 09, 2007 07:22 AMTrackBack URL for this entry:
http://www.transterrestrial.com/mt-diagnostics.cgi/7841 Listed below are links to weblogs that reference this post from Transterrestrial Musings.
Comments
Hi All, I wonder how Richard Branson's parents (91 and 88) will handle 7 G's, not to mention Stephan Hawkings... Thomas from the link: I wouldn't be surprised if they could handle 3-4 g for 20 seconds, Stephen Hawkin as well (didn't he go through repeated 3+ g periods during his parabolic flights or was it less?). I hope all of them can. Habitat Some reference points. Max G's during a Shuttle flight to orbit and return are about 3-4 with the astronauts lying on their backs during launch. I believe the Disney Mission Space ride has a max. G force around 2 or so. And they have lost a couple kids on it from heart problems since it opened. So actually a force of 7 G's, even for a few seconds is very significant and far more then John Glenn endured on his Shuttle mission to orbit. Also it appears from the article that Burt Rutan has abandoned the feathered tail approach used in SpaceShipOne. I wonder why given its was supposed to be the biggest break through of SpaceshipOne... Posted by at July 9, 2007 04:38 PMAlso it appears from the article that Burt Rutan has abandoned the feathered tail approach used in SpaceShipOne. Assuming the unnamed commenter is referring to the TSR article, I can't understand how such a conclusion could be drawn. Binnie never said that the feathering approach was being abandoned, and said that feathering was simpler than other approached, like BSC's variable ballistic coefficient concept announced last week. Posted by Jeff Foust at July 10, 2007 03:07 PMIn reply to anonymous (Thomas?), G force: It will not be experienced as 7 g, please read up on the difference between horizontal and vertical (as experienced) g-force and also "eyes out"/"eyes in" (a seperate issue). The differences in position in regard to the g force has to be accounted for in all your examples, none of which have people lying down flat "on the floor" and some of which make a point out of applying g forces in just about all directions (rollercoasters etc.). Feathering: SS2 will be using feathering, the SS2 is a scaled up and refined/improved SS1. That's official and has been for a long time. Perhaps anonymous (Thomas?) is confusing speculation about Tier III or Rutan's/SC's involvement with t/Space and their launch system for the orbital CXV (which looks nothing like SS1/SS2) with the completely seperate issue of the suborbital WK2/SS2? Armadillo, MSS, TGV, and Blue Origin, are all going for a HTHL design where they fire the rockets on descent to slow the vehicle down. The small (1-person) ARCA Stabilo uses parachutes on the seperated engine and payload modules. SS1/SS2 uses feathering and then gliding. Feathering is/was a novel method for increasing drag to bleed off return speed that has additional advantages (self-stabilizing, easy passenger positioning in relation to g force, dual use of surfaces, relatively low "re-entry" heating issues, simplicity*). The big fuss: feathering was a new approach and it worked. * the simplicity makes for easier redundancy if deemed necessary, in this case multiple independent hydraulic systems all working on the shared axis for shifting between feathered and glide mode. It wouldn't surprise me if the bigger SS2 has this. Posted by Habitat Hermit at July 11, 2007 12:43 AMHi, Yes, it seems names are not automatically saved on this blog as with Space Politics or Personal Spaceflight and I saw no way to fix it without reposting. In regards to the examples, the Shuttle astronauts are on their backs in relation to the G forces from the Shuttle’s engines, so by your statement the 2-3 G’s they take are not really 2-3 G’s. Or the 3-4 G’s on a Soyuz re-entry with the Cosmonauts in acceleration couches with their backs to the g-forces of re-entry is less then they seem. http://media.nasaexplores.com/lessons/03-067/9-12_article.pdf Now as noted in this NASA article the G-forces on a Soyuz may go up to 9 G’s if there is a problem as on Expedition 6 with a shorten re-entry profile. Something that will also have to be kept in mind if the normal G-force on re-entry is already 7 G’s for Spaceshiptwo. Which brings us to the question, wasn’t the purpose of feathering the wing to reduce G’s on re-entry to make it easier? Or was it to just to reduce overall stress on the system? I invoke Carmack's defense. You can continue this conversation on your own Thomas as you obviously don't read what I write. Posted by Habitat Hermit at July 11, 2007 10:30 PMHabitat, You didn't read what I wrote. A 7 G re-entry is higher then the Shuttle or Soyuz normally experiences. And higher then the 5 G Spaceshipone experienced. So what is the advantage of the feathered wing if the passengers will still have to undergo more stress then existing orbital systems? Vehicles may be designed to take more stress and be redundant. Human redesign is not an option and given the aging of the baby boomers, which seem to be the prime market for space tourism, makes you wonder if a 7 G design is wise. Posted by Thomas Matula at July 11, 2007 10:45 PMPost a comment |