Malenfant wrote:I though Orion ships were supposed to be really long
(to keep the habitation modules away from the nasty radiation at the
back)? Or is this some alternative design? Looks nice either way

Why should it be long to avoid that? The bombs will detonate several
kilometers behind the ship, so the relatively small size of the rocket won??t
matter much. It??s the thickness and material of the pusher plate that??s
important. It??s somewwhere around a hundred meters thick...
Here??s the design i based it on: Dyson??s so-called super-orion... It is as
big as a city, weighs 8 million tons, and holds thousands of people (the
image to the right on the page):
http://www.astronautix.com/lvfam/orion.htm... This is the *slow* version, top speed about 0.1c. Using it to go to Alpha
Centauri would take almost 2000 years... So, it is a generation ship.
There exist several alternative designs, and something like this will most
surely never be built: there are much faster (and smaller) Orion concepts,
most notably the "ablative" design that will need much less shielding and a
very thin pusher plate. But that was too tiny for my taste... When setting
out to colonize a star system, you need a full, working society from day one,
or you won??t be able to maintain the technological level for long...
Dollan wrote:I think that this is the ship after it has arrived at its
destination and dropped off the spent tanks and drive modules - which in
itself is an alternative design
No, the ship brakes down and goes into orbit. No reason to throw anything
away, since it can be as big as one wants: there are no restrictions. Carry
as much fuel (bombs) as neccecary to do whatever you want to. (On a
side note, Von Braun suggested that the pusher plate be constructed of
uranium so one could use it, too, as fuel after arriving in the star system).
This one brakes down by swinging by a gas giant (Aegir) first, then a
terrestrial planet (Himinglaeva) a few years later. The last leg by turning
around and detonating a million bombs ahead of it...
Here??s the trajectory:
And here it is braking "under power", with only days to go until arrival at Hroenn:
... Note that the ship goes in
backwards: the planet will simply pass by
the ship while it is braking: motion here is from right to left for both the
planet and the ship.
- rthorvald