Launch date latest for CRS-3/SpX-3 - now 2014.Article by Pete Harding (with the meat) and the dates covered by yours truly.http://www.nasaspaceflight.com/2013/08/nasa-planners-switch-spacex-dragon-mission-2014/
Chris what was the source of the 800kg limit on Dragon. I find that hard to believe.
Quote from: mlindner on 08/15/2013 06:33 amChris what was the source of the 800kg limit on Dragon. I find that hard to believe.My source was a recent (late July) ISS status presentation to the NASA Advisory Council by ISS Program Director Sam Scimemi.The slide in question is attached - see the last line:"The F9v1.1 rocket is planned to increase the upmass capability from 800 kg to 1580 kg of cargo."Don't know whether that's total cargo or just pressurised cargo though.I agree they are unbelievable numbers - Dragon was sold as having 3,300kg of up-mass. Progress can do 2,500kg. Maybe an example of over-optimistic SpaceX performance claims.
In CRS-1, Dragon on Falcon 9v1.0 delivered 905 kg of cargo.
Quote from: ChrisWilson68 on 08/15/2013 09:43 amIn CRS-1, Dragon on Falcon 9v1.0 delivered 905 kg of cargo. where is this number from?acc. to the crs-1 press kit (http://www.nasa.gov/pdf/694166main_SpaceXCRS-1PressKit.pdf) crs-1 dragon delivered 400 kg of cargo (it was 905 kg with packing)
Perhaps the the slide means that the increase in performance will be somewhere between an 800 kg increase and a 1580 kg increase.
Quote from: aga on 08/15/2013 10:16 amQuote from: ChrisWilson68 on 08/15/2013 09:43 amIn CRS-1, Dragon on Falcon 9v1.0 delivered 905 kg of cargo. where is this number from?acc. to the crs-1 press kit (http://www.nasa.gov/pdf/694166main_SpaceXCRS-1PressKit.pdf) crs-1 dragon delivered 400 kg of cargo (it was 905 kg with packing)Yeah, the 905 kg includes packaging. That's the only number that's meaningful in terms of the vehicle's performance capabilities.How much of the upmass is packaging versus useful cargo depends on the nature of the cargo and has nothing to do with the vehicle (Dragon + F9) capabilities.
... Packing mass is the same as spacecraft dry mass in their eyes. ...
1.0 SCOPE... Cargo combined with packing materials and/or flight support equipment is referred to as “customer cargo”. NASA will provide external cargo to the Contractor without flight support equipment, referred to as “usable cargo.” 2.4. CARGO INTEGRATIONThe Contractor shall safely integrate NASA cargo into the cargo module and or external carrier. NASA will provide pressurized cargo already packed to the Contractor. NASA will provide unpressurized (external) cargo without flight support equipment to the Contractor.ATTACHMENT V.1. GLOSSARYCustomer Cargo -- Cargo and/or payloads including packing materials, attachment hardware and/or FSE. For internal cargo, this definition only includes systems racks and International Standard Payload Racks (ISPRs); other racks are excluded.Usable Cargo -- Cargo and/or payloads without any packing material, attachment hardware or FSE.
I'd suggest you pull the line from the article because we don't know exactly what value is being qualified here.
Quote from: edkyle99 on 08/15/2013 02:33 pm... Packing mass is the same as spacecraft dry mass in their eyes. ...NASA does distinguish between the two. NASA defines "usable cargo" and "customer cargo". Pressurized mass is based on "customer cargo" which includes packing (and on which the $/kg is based). That makes sense as the provider has no control over NASA packaging.Quote from: CRS contract1.0 SCOPE... Cargo combined with packing materials and/or flight support equipment is referred to as “customer cargo”. NASA will provide external cargo to the Contractor without flight support equipment, referred to as “usable cargo.” 2.4. CARGO INTEGRATIONThe Contractor shall safely integrate NASA cargo into the cargo module and or external carrier. NASA will provide pressurized cargo already packed to the Contractor. NASA will provide unpressurized (external) cargo without flight support equipment to the Contractor.ATTACHMENT V.1. GLOSSARYCustomer Cargo -- Cargo and/or payloads including packing materials, attachment hardware and/or FSE. For internal cargo, this definition only includes systems racks and International Standard Payload Racks (ISPRs); other racks are excluded.Usable Cargo -- Cargo and/or payloads without any packing material, attachment hardware or FSE.
Respectfully, I disagree - to me, the line in the slide is clear.It says "The F9v1.1 rocket is planned to increase the upmass capability from 800 kg to 1580 kg of cargo". That says to me that the old limit was 800kg, and the new limit will be 1580kg
Quote from: Space Pete on 08/16/2013 11:01 amQuote from: mlindner on 08/16/2013 10:51 amI'd suggest you pull the line from the article because we don't know exactly what value is being qualified here.Respectfully, I disagree - to me, the line in the slide is clear.If people are arguing about the interpretation, then it clearly isn't very clear.
Quote from: mlindner on 08/16/2013 10:51 amI'd suggest you pull the line from the article because we don't know exactly what value is being qualified here.Respectfully, I disagree - to me, the line in the slide is clear.