You can hear the results of the bottle icing up at the end. The valves have been turned off and the gas is melting and vaporizing still.

Chook2 said...
Just had a phone call from a mate that was camping on the top end of Lake Dundas. He said that they heard a thundering noise at about 20 past 6 on Saturday night.
I just checked my video that was taken during my run at 13 minutes past 6.

I wonder if it's possible that the noise followed the lake system down to them.

They were camped 112 kms away.
Does it seem possible.

probably not, the sound all reflected back off the surrounding hills. when your jet shut off we listened to the echo coming in from all around the shoreline for a full minute. truelly beautiful music.
when we wer out cutting wood,travis was wondering why his stihl chainsaw suddenly sounded like a truck. your jet drowned out the chainsaw in his hands from over 2kms away!!!!!!!!

amazing!!!!!

Chook, googgled Mr hillier, learnt a thing or too, as you doooo. sellected a few interesting snaps on images, hope all enjoy

Could it be heard 120km away? Hmm...
I once DJ'd at an outdoor rave near Goulburn, friends of the land owner called up to tell him they could hear the music clearly 50km away in a straight line with 40km of eucalypt forest in between. The sound system was 60,000 watts with an SPL of about 126 DB at 1m.

I will guarantee that the pulse jet generated a grate deal more that 125 DB my guess would be a tad over 210 DB and with only 27 km of light scrub separating Lake Lefroy and Cowan I reckon its definitely plausible.

Chook how about next test you get one of your students to hold a noise meter at a safe distance?

wevw had a report of it being heard clearly at st ives And the echo after it shut off.
the evening was soooo still so anything is possible.
It was fascinating to hear a sound through your chest and jaw despite the earplugs.
I christened the machine "feel the noise"

I have been wanting to put a Pulse Jet on one of my RC planes, I have seen it done and I'm addicted, just gotta have the skills to do it.