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New Boeing PETA pulsejets

PostPosted: Sat Aug 06, 2011 11:45 am
by Willzilla
This might be of interest to anyone interested in pulse jets.

http://www.youtube.com/watch?v=chmmUF9fPSE

I dont know if this has been posted here before but please tell me if it has!

Re: New Boeing PETA pulsejets

PostPosted: Sun Aug 07, 2011 4:18 am
by RCModelReviews
They're not the only US Aerospace companies working on new advanced pulsejet technology - but I can't say any more ;-)

Re: New Boeing PETA pulsejets

PostPosted: Sun Aug 07, 2011 10:03 am
by Willzilla
THANKS im so curious now and I have to be left wondering. All I want to know is if there is going to be a more quiet and efficient kind of pulsejet that still gets very hot. Im mainly interested in low noise for a secret project of mine ;) How would one go about making a pulsejet more quiet?

Re: New Boeing PETA pulsejets

PostPosted: Sun Aug 07, 2011 11:51 pm
by RCModelReviews
To make a pulsejet quiet you have to convert what is a pulsating gas-flow into a continuous gas-flow. This is a process called integration and is exactly what the muffler on your car or motorbike does.

Unfortunately, integration usually requires the use of large, baffled expansion chambers which are bulky and heavy -- two things that don't go hand in hand with aviation.

I've experimented with running engines 180 degrees out of phase but that only gives about a 6dB reduction in sound level -- hardly enough difference to even detect with the human ear.

Re: New Boeing PETA pulsejets

PostPosted: Wed Feb 27, 2013 7:00 pm
by jorgea
To reduce sound level would be too costly and probably not worth the trouble












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