Re: [ERPS] Peroxide rocket idea

On Fri, 12 Jul 2002 13:08:55 -0400 (EDT), Henry Spencer <[EMAIL PROTECTED]> wrote: >> is it somwhat inappropriate to call it "liquid" hydrogen, or >> is there something funky going on with gas bubbles in the liquid that >> let us still call it a liquid even though it's compressible? > >No gas bub

Re: [ERPS] Re: ERPS-list digest, Vol 1 #328 - 12 msgs

There are, but for hightest mass fraction, you'd prefer not to haul around liquid catalyst. Besides, its one more tank, plumbing, headache - learned from Rotary Rocket experience. Dan In a message dated 7/12/02 6:41:35 PM, [EMAIL PROTECTED] writes: << Aren't there liquid catalysts? >> __

Re: [ERPS] Re: ERPS-list digest, Vol 1 #328 - 12 msgs

Aren't there liquid catalysts? Ian Woollard wrote: [EMAIL PROTECTED] wrote: [EMAIL PROTECTED]"> Gentlefolk, << it appears that HTP gets inactive w.r.t. most catalysts when it gets cold As most explanations of catalytic processes depend on the reactants being  mobile enough to meet on the catal

Re: [ERPS] Rocket Guy on /.

"simple, catapult launched giant water rockets that can take a load of skydivers to 15,000 feet in under a minute. This would be safer than airplanes. " cough hack ahem I cant really decide on just one witty remark/retort to that so I'll trust in your ability to choose the one you feel most apt.

Re: [ERPS] Ice

Dear Ian and all, <> I hadn't considered aerodynamic heating melting the surface of the icicle, but a layer of aerogel might take care of that. Anyway, I think that if there were some melting, that there would be enough vapor pressure to keep the mylar tight. It doesn't tear easily at all.

Re: [ERPS] Re: ERPS-list digest, Vol 1 #328 - 12 msgs

[EMAIL PROTECTED] wrote: [EMAIL PROTECTED]"> Gentlefolk,<< it appears that HTP gets inactive w.r.t. most catalysts when it gets cold As most explanations of catalytic processes depend on the reactants being mobile enough to meet on the catalytic surface, this doesn't surprize me. Yes. It

Re: [ERPS] Ice

[EMAIL PROTECTED] wrote: >Gentlefolk, >Also, ice, at cryogenic temperatures, is very strong in compression. >Hmmm. If H2O2 ice is similar, one could (in principle) freeze the HTP hard, >vacuum-wrap a mylar balloon over the icicle, and get out of the lower >atmosphere that way. > My suspicion

Re: [ERPS] Rocket Guy on /.

Too late for Darwin then. His genes live on even if he does not :-) Sander - Original Message - From: "Doug Jones" <[EMAIL PROTECTED]> To: "ERPS Main List" <[EMAIL PROTECTED]> Sent: Friday, July 12, 2002 1:47 PM Subject: Re: [ERPS] Rocket Guy on /. > Michael Wallis wrote: > >

Re: [ERPS] Rocket Guy on /.

Michael Wallis wrote: > > Hi ... > > Slashdot is featuring answers to 11 questions submitted by readers to > Brian Walker, the Rocket Guy up in Oregon. Interesting answers. > > I particularly noted question ten: "How d

[ERPS] Rocket Guy on /.

Hi ... Slashdot is featuring answers to 11 questions submitted by readers to Brian Walker, the Rocket Guy up in Oregon. Interesting answers. A detailed sequence for his planned flight (to 30 miles) can be found at:

RE: [ERPS] Peroxide rocket idea

On 12 Jul 2002, Sean R. Lynch KG6CVV wrote: > > ...Liquid hydrogen is halfway to being a > > gas: light, quite compressible, very low viscosity ... > > Hmmm, is the definition of a liquid as being an incompressible fluid > naive then... No real liquid is truly incompressible. Even water compre

RE: [ERPS] Peroxide rocket idea

On Wed, 2002-07-10 at 21:51, Henry Spencer wrote: > (For quite fundamental reasons, hydrogen essentially acts as if it was > considerably warmer than it is. Liquid hydrogen is halfway to being a > gas: light, quite compressible, very low viscosity -- less than that of > room-temperature air! --

[ERPS] Ice

Gentlefolk, << ...friction with interstellar matter >> Theres not enough of it for any meaningful friction or force. Even over the area of a proposed Bussard ram scoop, the drag is but a few newtons. You'll get spallation and erosion, but no meaningful force even at fairly high Lorentz fac

[ERPS] Re: ERPS-list digest, Vol 1 #328 - 12 msgs

Gentlefolk, << it appears that HTP gets inactive w.r.t. most catalysts when it gets cold >> As most explanations of catalytic processes depend on the reactants being mobile enough to meet on the catalytic surface, this doesn't surprize me. --Best, Gerald __

Re: [ERPS] PROTO mass fraction tweaks (was: Peroxide rocket idea)

Randall Clague wrote: > > On Thu, 11 Jul 2002 23:39:05 -0700, David Weinshenker > <[EMAIL PROTECTED]> wrote: > > >Dan is very strange. :) If he's not > >scheming to refine something to an insane > >degree, he's trying for a desperate kluge > >that might barely work... straight-up, off- > >the-sh

Re: [ERPS] FMC terms

On Fri, 12 Jul 2002 12:32:21 +0300, "Yossi Preminger" <[EMAIL PROTECTED]> wrote: >> I finally got some current data from FMC. Steven Yuan has gotten mixed >> reactions internally to dealing with a commercial customer (not working on >> a government contract), but it is being pursued. They may i

Re: [ERPS] PROTO mass fraction tweaks (was: Peroxide rocket idea)

On Thu, 11 Jul 2002 23:39:05 -0700, David Weinshenker <[EMAIL PROTECTED]> wrote: >Dan is very strange. :) If he's not >scheming to refine something to an insane >degree, he's trying for a desperate kluge >that might barely work... straight-up, off- >the-shelf, meat-and-potatoes engineering >see

Re: [ERPS] FMC terms

> I finally got some current data from FMC. Steven Yuan has gotten mixed > reactions internally to dealing with a commercial customer (not working on > a government contract), but it is being pursued. They may initially want > to rule out the use of the peroxide for manned vehicles, which seems