[AR] Re: Falcon 9 flight today
- From: George William Herbert <george.herbert@xxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Wed, 9 Oct 2013 00:47:09 -0700
Remember that nearly half the "sky" of a low earth orbit satellite is the
surface of the Earth, which is not cold at all, and radiates a lot of heat.
Temperatures cycle, but the "cold" near earth is nothing like deep space cold.
-george william herbert
george.herbert@xxxxxxxxx
Sent from Kangphone
On Oct 9, 2013, at 12:16 AM, JMKrell@xxxxxxx wrote:
> My data lists RP-1 vapor pressure at <2 Torr @20C. In the earth's shadow,
> space is very cold.
>
> In a message dated 10/8/2013 5:34:51 P.M. Pacific Daylight Time,
> hkeithhenson@xxxxxxxxx writes:
> The vapor pressure of RP-1 at 50 deg F is given as 0.031 psia.
>
> That's not high, but open to space, the stuff is going to evaporate
> unless, as Henry says, it's awful cold.
>
>
>
> On Tue, Oct 8, 2013 at 4:00 PM, Henry Spencer <henry@xxxxxxxxxxxxxxx> wrote:
> > On Tue, 8 Oct 2013 JMKrell@xxxxxxx wrote:
> >> > The vapor pressure of RP-1 isn't large by Earth standards, but it's
> >> > still substantial by vacuum standards. The RP-1 won't stay in the
> >> > tank, although it may leave a bit of residue behind.
> >>
> >> Henry, I agree with 99.9% of what you post, but on this I must go with
> >> my empirical data. Some RP-1 is expelled during the venting of the RP-1
> >> tank. The rest quickly gels and solidifies within the tank. Frozen
> >> fluids under high vacuum transfer mainly between hot and cold
> >> junctions... Most of the RP-1 remains a solid until the vehicle reenters
> >> the atmosphere.
> >
> > Is that empirical data published? If so, references please! I have
> > trouble believing that the solid would be stable in vacuum for any length
> > of time, unless the thermal situation was very unusual.
> >
> > Henry Spencer
> > henry@xxxxxxxxxxxxxxx
> >
> > (hspencer@xxxxxxxxxxxxx)
> >
> > (regexpguy@xxxxxxxxx)
> >
> >
>
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