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Re: new web site/status report
- To: DotarSojat@aol.com
- Subject: Re: new web site/status report
- From: kgstar@most.fw.hac.com (Kelly Starks x7066 MS 10-39)
- Date: Wed, 10 Apr 1996 16:03:38 -0500
- Cc: T.L.G.vanderLinden@student.utwente.nl, kgstar@most.fw.hac.com, stevev@efn.org, jim@bogie2.bio.purdue.edu, KellySt@aol.com, zkulpa@zmit1.ippt.gov.pl, hous0042@maroon.tc.umn.edu, rddesign@wolfenet.com, David@interworld.com, lparker@destin.gulfnet.com
At 4:37 PM 4/10/96, DotarSojat@aol.com wrote:
>On 4/10/96 at 10:35 am EDT, Kevin wrote-
>
>>(At 1G continuous thrust)...Even the antimatter rockets can't
>>get up to .99 lightspeed with a mass ratio of 52.
>
>Two points--
>
>1. With the saturation of apparent velocity, the implications
>of .99 lightspeed are obscured. A peak apparent velocity of
>0.99 ltyr/yr represents a peak proper velocity of 7.0179
>ltyr/yr and an acceleration distance (at 1g) of 5.90 ltyr.
>(I.e., a destination distance of 11.8 ltyr with 1g deceleration,
>also. BTW, my astronomy book gives the distance to tau Ceti as
>10.3+/-0.3 ltyr.) What mass ratio does MARS require to decel-
>erate at 1g from this peak velocity? (I think that's the 52,
>from Timothy's 3/30 table, that you're quoting, which is for
>100 percent conversion of captured microwave energy to exhaust
>kinetic energy.)
>
>2. An optimum antimatter rocket with a peak proper velocity Uend
>of 7.0179 ltyr/yr has an optimum constant exhaust velocity Vexh
>of 0.8851. The required mass ratio (r = exp[asinh(Uend)/Vexh])
>is 19.89. (These calculations assume no energy losses, but also
>assume no gain from optimizing the exhaust-velocity profile.)
>
>Regards, Rex
Can I assume the 19.89 mass ration is composed of 1/4th antimatter and
3/4ths reaction mass (normal matter)?
Kelly
P.S.
By the way the fusion fuel mass ratio I got for the Explorer Class was
about 55 to 1. Since I thought the reaction mass ration for the MARS was
less, I don't know if 52 to 1 refers to that. Unless the MARS number I was
remenbering was for a 1/3rd C decel?
P.S.S.
By the way, I was wounderin. DID ANYONE LOOK AT THE NEW WEB PAGES!!?? the
ones under Explorer_Class, Status_Report, and Support_Craft at Daves
http://165.254.130.90/LIT/InterStellar/project
Theres 50 - 60 pages of stuff up there so I expected some comment from
somebody. SOMEONE COULD AT LEAST LOOK AT THE PICTURES!
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Kelly Starks Internet: kgstar@most.fw.hac.com
Sr. Systems Engineer
Magnavox Electronic Systems Company
(Magnavox URL: http://www.fw.hac.com/external.html)
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