[AR] Re: Falcon 9 flight today
- From: Keith Henson <hkeithhenson@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 9 Oct 2013 08:44:54 -0700
50 F is 10 C, 0.031 psia is ~1.6 Torr so we are close enough on properties.
However, I don't think you can orbit in the earth's shadow. You can
in the sun, i.e., sun synch, but I can't think of a way to stay in
shadow.
Keith
On Wed, 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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