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 Post subject: A Bicycle Question
PostPosted: Mon Oct 18, 2010 8:47 pm 
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I have a feeling that this could turn out to be a very silly question,
but I really cannot make up my mind, so:

Would a mountain bike (and, as the next step, a motor bike) make
any sense as a vehicle on a desert world like Godot, where the bi-
ker would have to wear an environment suit with an oxygen supply
and a rebreather - basically "biking in a space suit" ?

On the one hand the image of the biking / motor biking Godot colo-
nists could add a nice bit of detail and colour to the setting, on the
other hand I do not remember to ever have seen the idea in any of
the genre stories and movies, and this may have a good reason.

So, what do you think ? - Thank you. :)


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 Post subject: Re: A Bicycle Question
PostPosted: Mon Oct 18, 2010 8:55 pm 
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I guess one problem would be that the air supply would run out faster (because the rider is exerting themselves a lot while riding the bike).

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 Post subject: Re: A Bicycle Question
PostPosted: Tue Oct 19, 2010 12:15 am 
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Stirling engine/power source.

You got plenty of sunlight?
You got plenty of heat differential?
Then the Stirling engine is for you.

(Some times called the air engine)

Place a Stirling engine on a Tesla Turbine and you got one heck of a motor or pump. :)

(something I am working on, sigh, if only I had a mini-machine shop or mill.)

Dave Chase

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 Post subject: Re: A Bicycle Question
PostPosted: Tue Oct 19, 2010 12:43 am 
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EDG wrote:
I guess one problem would be that the air supply would run out faster (because the rider is exerting themselves a lot while riding the bike).

True, a good point. So it should be motorized, a motor bike or perhaps trike.
Dave Chase wrote:
Stirling engine/power source.

A motor bike or trike with a Stirling engine ... an interesting idea, unfortuna-
tely I am not aware of any design system that would include the data for a
Stirling engine, but I could of course try to estimate them, compared to a
normal combustion engine ... I have to think about this.

Thank you both very much. :D


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 Post subject: Re: A Bicycle Question
PostPosted: Tue Oct 19, 2010 1:28 pm 
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http://www.tiaxllc.com/t/stirling_engin ... ations.php

Doesn't say how small but I imagine @ 800W it is small. It is an air breather however.

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 Post subject: Re: A Bicycle Question
PostPosted: Tue Oct 19, 2010 1:47 pm 
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Thank you very much. :D

An air breather is indeed bad news when it comes to the Godot setting.
However, it seems a Stirling engine - in this case of course a bigger one -
could be an interesting way to produce energy from solar radiation without
having to first produce solar cells, which would probably be impossible for
the Godot colonists.

This solar energy could be used to reload power cells, and the power cells
could provide the energy for the bikes or trikes - making them perhaps a bit
heavy, but on the other hand the 0.85 g of Godot could help to keep that
problem comparatively small.

If the GURPS system I use allows me to build a bike or trike that can run for
six hours (the average oxygen supply of an environment suit, and therefore
the maximum time a colonist can normally stay outside of the habitat) on bat-
teries with a speed of at least 30 km/h off-road, I will most probably use that
option.


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PostPosted: Tue Oct 19, 2010 10:13 pm 
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I ride my mountain bike to work, to the library, to the grocery store, beach, libarary, shopping, well I am sure you get it by now.

Heck NO, you don't want any more weight/encumbrance/interference that you have to have.

Want it in stronger terms PM me, I sometimes put as much as 30 miles a day on my bicycle.

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PostPosted: Tue Oct 19, 2010 10:52 pm 
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gray lensman wrote:
Heck NO, you don't want any more weight/encumbrance/interference that you have to have.

So the mountain bike is out, because an environment suit with backpack
would obviously be quite a bit of encumbrance ... that leaves the motor
bike or trike to think about. :)


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 Post subject: Re: A Bicycle Question
PostPosted: Wed Oct 20, 2010 3:13 am 
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Hmm, here is some general information on solar - stirling engine power sources

http://www.brighthub.com/environment/re ... 65860.aspx

http://www.stirlingenergy.com/how-it-works.htm

Dave Chase

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 Post subject: Re: A Bicycle Question
PostPosted: Wed Oct 20, 2010 8:20 am 
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Thank you very much for the links. :D


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