Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
This would work fine, except in terms of success.

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H2O2 Airship

 Use H2O2 for buoyancy and propulsion
  (+2)
(+2) 		 

Use the steam from Hydrogen Peroxide mono-propellant, for buoyancy AND have it leave the airship creating a rocket motor.

Idea I had at 17 (1981) for a submarine, but then read about the Kursk. Recently I saw the Seconds from Disaster episode, and realized H2O2 has been sacked for no good reason, just like airships after the Hindenburg explosion.

—pashute, Jul 08 2013

Steam balloon
[xaviergisz, Jul 08 2013]

Coal powered water vapor balloon [pashute, Jul 08 2013]

Hot vapor balloon (LTA) [pashute, Jul 09 2013]





       "Propulsion poofs; [pashute] posterized per physics. Pictures presently."
—lurch, Jul 09 2013
   
         


 

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