Using atmosphere as propellant

Discuss the technical details of an "open source" community-driven design of a polywell reactor.

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rjaypeters
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Postby rjaypeters » Mon Sep 20, 2010 9:29 pm

"Aqaba! By Land!" T. E. Lawrence

R. Peters

Nydoc
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Postby Nydoc » Fri Apr 22, 2011 8:21 pm


DeltaV
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Postby DeltaV » Sat Apr 23, 2011 2:06 pm


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Postby Nydoc » Mon May 02, 2011 2:31 am


DeltaV
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Postby DeltaV » Mon May 02, 2011 3:57 pm


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Or let some-one else do the hard work ??

Postby Nik » Tue May 03, 2011 5:51 pm


DeltaV
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Postby DeltaV » Wed May 04, 2011 3:52 am

Skylon can't land in or take off from my back yard.

[Edit]
Skylon takeoff rotation speed: 590 km/hr or 367 mi/hr.
Can you say "infrastructure"?
Last edited by DeltaV on Fri May 13, 2011 2:47 pm, edited 1 time in total.

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Postby mvanwink5 » Wed May 04, 2011 5:25 pm

What about using a polywell powered heavy lift vehicle to launch material and supplies, and a different vehicle for the human payload? A "Reaver" rocket, to use a Firefly movie reference, without the radiation shielding, for the heavy lifting. A vehicle to go to mars could use distance from the reactor, rather than heavy shielding for reducing radiation exposure. Just some other thoughts.
Near term, cheap, dark horse fusion hits the air waves, GF - TED, LM - Announcement. The race is on.

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Postby Nydoc » Wed May 11, 2011 11:07 pm


DeltaV
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Postby DeltaV » Thu May 12, 2011 2:51 pm


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Postby DeltaV » Thu May 26, 2011 2:43 pm



Image

45,000,000 We / 90,000 lbf = 500 We/lbf with superconducting motors.
{About twice as efficient as the F-35B lift fan's (mechanical power in)/(lift force out)}.

So, using this thrust efficiency for a very rough estimate (ignoring fan, motor and duct efficiency differences between VTOL hover using rotating motor-fan ball modules and take-off using an aft-dorsal, linear propulsor array) a vehicle weighing about 1,000,000 lb (747-8 class) with superconducting motors would require

(1,000,000 lb)(500 We/lbf) = 0.5 GWe

to hover in VTOL mode.

An order of magnitude less electrical power than needed by the REB for boost into orbit.
Hence my "hover or cruise all day before and after orbit" philosophy.

[EDIT - fixed dead link, added picture and F-35B comment]
[EDIT - Picture link above gone behind paywall -- uploaded below and added link to NASA paper]

Attachments
DistributedTurbo-ElectricPropulsion.png
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Postby ladajo » Thu May 26, 2011 9:00 pm


DeltaV
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Postby DeltaV » Sat May 28, 2011 2:06 pm


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Postby WizWom » Tue Jul 19, 2011 9:00 pm

Last edited by WizWom on Thu Jul 21, 2011 8:09 pm, edited 1 time in total.
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Postby KitemanSA » Tue Jul 19, 2011 9:59 pm



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