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Re: starship-design: HIGHLY OPTIMIZED TOLERANCE
In a message dated 3/20/00 9:25:41 PM Pacific Standard Time, KellySt@aol.com
writes:
>
> In a message dated 3/20/00 2:42:49 PM, clmanges@worldnet.att.net writes:
>
> >> Dead reckoning navigation (see star and go that way) is the method I
> >intend
> >> to use and so do not have much use for trigonometric limitations
> >> or getting lost in space ;+)>
> >
> >You'd really try to pilot a ship over interstellar distances that way??!
> >You've
> >got to be kidding.
>
> Its trivial. Aim at the star and boost. Its not going to move relative
to
> the sky? Least not in under a few thousand years. At long as you can
> range
> your distence to know when to start your decel.
Trivial is true as the simpler is the better method.
Taking as example a journey to Alpha Centoria at 4 1/4 light years at a
constant accelerating 1 g to maintain artificial gravity one need to
accelerate 1/2 the distance and then turn 180 degrees and decelerate at the
same rate for the remainder of the distance. (7.68 years round trip earth
time). The star would be centered in the nose window the first part and then
centered in the rear view mirror (preventing neck strain) for the
deceleration.
Though eye fatigue is not a foreseen problem, as I never have tired at
looking at the stars, I would also rope lash the throttle and directional
controls to permit sleep, work, rest and other duties with the simplest of
auto pilot systems devised for sea journies ;=)
The more complicated systems used for navigation today were developed for
needs as destinations were hidden by curved horizons, mountains, trees, cloud
cover, darkness, and even unobtainable by encounters with current and wind
directions.
These needs are not present (requiring complex navigational aids) for star
travel.
I take only what I need and like to take.
Taking manual control when in Alpha Centoria's gravity field, ample power
will be used to check out any orbiting rocks for suitable landing sites.
The reason I think that Hubbell's systems were a poor example as useful, is
that they often require repairmen from earth not expected on star journeys of
long distance and time.
An accurate range finder to determine when to decelerate is the current
problem needing a solution I have yet to find. Measuring distance by star
brightness is not a good Idea, telescopic resolution of disk diameter is not
workable for resolution clarity and the trigonometric function tables derived
from calculus at the angles near zero degrees and 90 degrees are values that
the calculations differ greatly from measured values over long distances and
6 place tables are little help. triangleization method from measuring angles
to the star from spots opposite in the earth orbit fall in accuracy. I may
have to steer a zigzag course to get accurate trianangleization data and that
I do not want to do very often as it would require a path perpendicular to by
line a travel.
Doppler shift is so inaccurate as there is no way I know of to determine if
the doppler shift of acceleration is determined by position location in an
accelerating universe or a Doppler shift caused by relativistic effects of
starlight in gravity field.
Does the group have any thought, ideas, methods or machines to solve the
problem or know of others attempt or solution to answer the question "How far
is that star?" with any accuracy and given plus or minus values. It would
seem reasonable to be sure of the distance before starting the journey
Regards,
Tom
>
>
>
>
> >>
> >> Regards,
> >> Tom
> >>
> >> >
> >> > Curtis
>
>
>
> Kelly
>
>