Eventually
everyone wants to leave earth behind and do some solar exploring. There
are two methods for interplanetary travel. Direct
point to point flying, star wars style,
and the Hohmann transfer.
The
direct method is preferred. It allows you to leave at any time and get
to where your going as quick as possible. It is what we
do every day going back and forth to
work. Oh its not that fuel minded, we get off course turning this way
and that wherever the road leads. Its also how we travel by plane let
say going from New York to London in
this case taking the most direct route
but burning fuel the whole way to overcome gravity and astmoshereic
drag.
Now
in actual space travel the direct flight is never used. If you have
launched and docked to any station you have already found
this out. We are confined to the more
fuel efficient methods. Here is why.
1. no place to stop on the way and tank up
2. we need to take our oxygen as well as fuel with us
3. the most important , we must launch the full weight of all this out of the earths atmoshere.
2. we need to take our oxygen as well as fuel with us
3. the most important , we must launch the full weight of all this out of the earths atmoshere.
These are the three main limitations of using chemical rocket engines.
Futuristic
ships will have more powerful engines and won't be so limited. Most
likely because they won't be chemical rockets. In the
default Orbiter there are no futuristic
ships with such Powerful engines.
- Atlantis, realistic model of Space Shuttle, LEO only, dock to station
- Shuttle A , futuristic heavy lift cargo ship, launch to a station only
- Delta Glider, Futuristic ship, with the ability to reach other planets,
- Dragonfly , space station builder, no atmospheric flight capabilities
- Shuttle A , futuristic heavy lift cargo ship, launch to a station only
- Delta Glider, Futuristic ship, with the ability to reach other planets,
- Dragonfly , space station builder, no atmospheric flight capabilities
As
you can see without add-on ships the Delta Glider is the only ship
capable of reaching the moon or other planets. Yet, the DG
must use the Hohmann transfer method of
space travel because of its low power chemical rocket engines. So what
is the Hohman transfer? I think everyone who has flown in an airplane
understands direct flight.
Take off, aim for target, fire up engines. Hohmann transfers are not so
simple. It works like this,
while in orbit you burn progade until
the eclipse is so large that apoapsis intersects the orbit of the target
planet or moon. Once intersect accurs you quit burning and coast all
the way there. As you can see there
needs to be some planning for this type
of flight. You need to aim your intersect to nail the target planet at
the time of arrival. So a little bit a math is involved with the help of
the Tran MFD. However a good
flight computer can do the calculations
for you. The TansX MFD is an add-on MFD worth obtaining. Duncan Sharpe
has complete tutorials on using TransX MFD which is his creation. Now included in the base Orbiter
download.
If you get a powerful add-on ship you can use the direct flight method for interplanetary flight. I like the Star Trek ship USS Voyager myself or the Millenium Falcon.
However I recommend that any star ship captain know how to do a Hohmann
transfer. It is one of the fundamental basics of space flight.
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