Re: [ERPS] blowdown SSTO

Henry Spencer wrote: On Wed, 5 Mar 2003, Ian Woollard wrote: Yes, it's about equal to what the Titan II first stage achieved in 1961. For some reason, matching that does seem to be a big challenge. Encyclopedia Astronautica: Gross Mass: 117,866 k

Re: [ERPS] blowdown SSTO

On Wed, 5 Mar 2003, Ian Woollard wrote: > >Yes, it's about equal to what the Titan II first stage achieved in 1961. > >For some reason, matching that does seem to be a big challenge. > > Encyclopedia Astronautica: > Gross Mass: > 117,866 k

Re: [ERPS] blowdown SSTO

kevin bollinger wrote: It might not be that much of a challenge , remember the Titan also had to burn 2-3% Of GLOW to run it's turbopumps , That's true, but I bet that it got ~6% increased ISP from being able to have a chamber pressure of ~705 psi rather than say 150 psi. and pressure feds ca

Re: [ERPS] blowdown SSTO

TECTED]> To: "ERPS" <[EMAIL PROTECTED]> Sent: Wednesday, March 05, 2003 8:13 AM Subject: Re: [ERPS] blowdown SSTO > On Fri, 28 Feb 2003, Ian Woollard wrote: > > I've run simulations of this sort of thing; roughly speaking. You're > > looking at a dry ma

Re: [ERPS] blowdown SSTO

Henry Spencer wrote: On Fri, 28 Feb 2003, Ian Woollard wrote: I've run simulations of this sort of thing; roughly speaking. You're looking at a dry mass fraction of less than 4%, probably closer to 3%; that's about 1/2 that of a Roton... Challenging! Yes, it's about equ

Re: [ERPS] blowdown SSTO

On Fri, 28 Feb 2003, Ian Woollard wrote: > I've run simulations of this sort of thing; roughly speaking. You're > looking at a dry mass fraction of less than 4%, probably closer to 3%; > that's about 1/2 that of a Roton... Challenging! Yes, it's about equal to what the Titan II first stage achie

Re: [ERPS] blowdown SSTO

At 12:59 PM 3/5/2003 +, Ian Woollard wrote: John Carmack wrote: Composite tanks with a 200 psi burst pressure can be fabricated with SSTO mas fractions fairly easily. Matter of interest, what kind of weight/volume ratios are currently available at this kind of pressure? And similar

Re: [ERPS] blowdown SSTO

John Carmack wrote: Composite tanks with a 200 psi burst pressure can be fabricated with SSTO mas fractions fairly easily. Matter of interest, what kind of weight/volume ratios are currently available at this kind of pressure? -- -Ian Motto: "You're Not Authorized to Know Our Motto." "War is ne

Re: [ERPS] blowdown SSTO

On Fri, 28 Feb 2003 14:35:32 -0800 (PST), Michael Wallis <[EMAIL PROTECTED]> wrote: >I know Randall will be thinking "Oh no. Here he goes ..." but - Yes, a >pressure fed system should be capable of delivering SSTO performance >if you have a working aerospike engine and very light composite tanks.

Re: [ERPS] blowdown SSTO

Bollinger - Original Message - From: "David Weinshenker" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, February 28, 2003 3:15 PM Subject: Re: [ERPS] blowdown SSTO > John Carmack wrote: > > > > At 01:49 PM 2/28/2003 -0800, you wrote: >

Re: [ERPS] blowdown SSTO

John Carmack wrote: > > At 01:49 PM 2/28/2003 -0800, you wrote: > > Yup , another thing to think about is if you have a lot of nozzles in your > >100 ratio plug , after 50,000 ft you shut off 1/2 of them , Instant 200 > >ratio ! ( Isp 300 to 340 ) > > I don't think you get to 340 with even an in

Re: [ERPS] blowdown SSTO

John Carmack wrote: If plug nozzles actually work to allow automatic altitude compensation, it seems like it should be possible to do an SSTO with blowdown pressurization and light tanks. My reasoning is that the bulk of the delta-V that an SSTO needs is generated outside the atmosphere, and w

Re: [ERPS] blowdown SSTO

John Carmack wrote: > If plug nozzles actually work to allow automatic altitude compensation, it > seems like it should be possible to do an SSTO with blowdown pressurization > and light tanks. > > My reasoning is that the bulk of the delta-V that an SSTO needs is > generated outside the atmo

Re: [ERPS] blowdown SSTO

At 01:49 PM 2/28/2003 -0800, you wrote: Yup , another thing to think about is if you have a lot of nozzles in your 100 ratio plug , after 50,000 ft you shut off 1/2 of them , Instant 200 ratio ! ( Isp 300 to 340 ) I don't think you get to 340 with even an infinite expansion in vacuum. Not sure

Re: [ERPS] blowdown SSTO

system . Kevin Bollinger - Original Message - From: "John Carmack" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, February 28, 2003 1:37 PM Subject: [ERPS] blowdown SSTO > If plug nozzles actually work to allow automatic altitude compensation, it

[ERPS] blowdown SSTO

If plug nozzles actually work to allow automatic altitude compensation, it seems like it should be possible to do an SSTO with blowdown pressurization and light tanks. My reasoning is that the bulk of the delta-V that an SSTO needs is generated outside the atmosphere, and with no back pressure,