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Post by turbochris on Feb 12, 2012 10:01:57 GMT -5
I've been wanting to build one. I'm thinking of building the valve inside the tank. A tapered pintle would close the throat and retract into the tank. I guess putting the nozzle low on the tank would be best. One of these days I'll go to a factory that's stamping domes for tanks and get some stainless domes. I think I have the fabricating resources for everything else but the domes.
My biggest concern, believe it or not, is safety. If I ever took something like this to the drag strip i think I'd spend all my time securing the area behind the nozzle from the moment the water gets heat until the water is cold or gone.
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mator
Junior Member
Joined: January 2012
Posts: 76
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Post by mator on Feb 12, 2012 11:24:41 GMT -5
Ok. Safety is first of all. It will be stupid to not belive in this)))) Due to things we do)))
What volume of tank do you want to have? What pressure (temperature)?
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Post by Johansson on Feb 18, 2012 7:23:43 GMT -5
I have a question about corrosion: do your bottle have any corrosion ( of course inside of the bottle))) )? Sorry for the late answer, no I haven´t seen any signs of corrosion inside the bottle (rust coloured water) and that is because we keep the valve open after the run so all water can boil off. The bottle is so hot that the water left in the bottle turns to vapour and leaves the bottle dry inside once it has cooled down. |
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mator
Junior Member
Joined: January 2012
Posts: 76
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Post by mator on Feb 18, 2012 10:10:18 GMT -5
Thank you! I have some little corrosion, on the inner surface of my bottle. I think that it is not important at all.
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mator
Junior Member
Joined: January 2012
Posts: 76
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Post by mator on Nov 5, 2012 6:16:55 GMT -5
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miuge
Veteran Member
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Post by miuge on Jan 18, 2015 11:55:30 GMT -5
Is anybody building steam rockets anymore? As our turbine bike is pretty much finished we would like to have a new little project  Is there any advantages if we add a water ejector before the nozzle? As the water from the bottle runs out pretty quickly and remaining steam itself has no force? www.youtube.com/watch?v=8MvHplOIQCI |
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Post by Johansson on Jan 19, 2015 2:58:01 GMT -5
We quit because of the dangers involved in externally heating an unclassified gas tank, the last time we ran our large steam rocket a bulge appeared on the side of the argon gas bottle with us standing right next to it.......
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metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on Jan 19, 2015 11:59:41 GMT -5
We quit because of the dangers involved in externally heating an unclassified gas tank, the last time we ran our large steam rocket a bulge appeared on the side of the argon gas bottle with us standing right next to it....... Pssh argon's innert - don't be a pussy  |
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Post by Johansson on Jan 19, 2015 15:08:02 GMT -5
We quit because of the dangers involved in externally heating an unclassified gas tank, the last time we ran our large steam rocket a bulge appeared on the side of the argon gas bottle with us standing right next to it....... Pssh argon's innert - don't be a pussy Well, this particular Argon bottle was 3/4 filled with water and heated with an industrial oil furnace burner up to 80 bar steam pressure... |
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miuge
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Post by miuge on Jan 19, 2015 15:27:10 GMT -5
Sounds too dangerous done that way, maybe we'll forget steam rockets  |
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Post by Johansson on Jan 19, 2015 15:38:58 GMT -5
Sounds too dangerous done that way, maybe we'll forget steam rockets Don´t give it up just yet, anyone into electrics might be able to make an induction coil that fits over the bottle. That way you are sure you only heat the part of the bottle where there is water on the inside (not the top if standing) and you won´t have to weld, tap or do any other mechanical adjustments to the bottle integrity. The coil could be part of the launch ramp so when the rocket takes off the coil stays on the launch pad. That way you won´t have to make quick release high current connections, and no risk of wrecking the coil when the rocket hits the ground. Go for it! |
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miuge
Veteran Member
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Posts: 200
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Post by miuge on Jan 19, 2015 15:58:20 GMT -5
We were thinking something we could drive with, naturally Always better if electricity isn't needed, heating with burner or campfire would have been so simple. Did you use steel argon bottle? Is there's any difference between newer and older bottles or between CO2 and argon bottles? |
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Post by racket on Jan 19, 2015 19:25:56 GMT -5
Hi Miuge
A propane burner would be the way to go , you must make sure heating is only applied to metal with water on the other side , not to the steam space , ............standard steam boiler practice, any steel oxy bottle would be more than adequate.
Feed the high pressure steam/water mix through a freepower turbine for lotsa horsepower ;-)
Cheers
John
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miuge
Veteran Member
Joined: March 2014
Posts: 200
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Post by miuge on Jan 20, 2015 9:55:43 GMT -5
I'd love to make one with freepower turbine! Just convince me about the safety issues... Do you have any view of adding water into steam jet before the nozzle? |
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Post by racket on Jan 20, 2015 16:36:17 GMT -5
Hi Miuge I worked on steam boiler for years , from little ones burning a few gallons an hours to bigger ones burning a thick bed of coal and producing 500 kgs of steam per minute at 200 psi , the inside brickwork of that big boiler's combustion chamber glowed yellow all the time, but the water tubes , only ~6mm thick, 100mm dia , and holding in 200 psi of pressure , weren't affected by those extremely high gas temperatures surrounding them. Boilers have "gauge glasses" which are glass tubes connected to the water within the boiler and indicate the level of water within the boiler , the water level must be maintained within the gauge glass , if the the level drops out of sight, the boiler must be shut down immediately to prevent a possible explosion , ...........LOL, its not easy dumping several tonnes of burning coal in seconds. The gauge glass is positioned so that it indicates a water level above any surface impacted by combustion gases , as long as theres water on the other side of the heating surface the metal should be OK . With a mixture of steam and water you have a very high mass flow rate thru any freepower turbine wheel , combined with a decent velocity it makes for serious horsepower potential, the steam pressure need not be excessively high . I've got both the steam rocket books from this site www.canosoarus.com/17Misc/Products.htm As for adding water into the gas turbine exhaust , the amount will be very small otherwise the temp drop of the gases is too high affecting their thermodynamics, water takes a lot of energy to change into steam . Cheers John |
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