Underwater Pulse Jet?

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Underwater Pulse Jet?

Post by Syler » Sat Jan 18, 2014 5:16 pm

Suppose one were to build a 45 deg bent pulsejet with the tail section under water and the intake above obviously.

Intuition tells me the following would be true: 100% of the intake air would come through the valves because water is so much more dense. The entire pipe would remain cool. The lower temp would result in more effective combustion. The vast pressure drop might even result in markedly increased compression. Last and most important, I wouldn't get charged with disturbing the peace.

Obviously, this would only work to power a water craft. Any thoughts?

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Re: Underwater Pulse Jet?

Post by nitro » Tue Feb 25, 2014 2:15 am

There is a underwater jet engine that uses steem to produce something a bit like water hammer thrust.Was invented in Australia & is being developed in England I think.I did pump water into my ER90 Pulse Jet tail pipe to see what effect it would have But nothing thrust wise changed.Only when I pumped Kero in did the thrust go from 13 to 14.5lbs.Perhaps the water could be used like a piston yet still blast the exhaust out a different way.Cold water would make things worce for clean burning I think.

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