Adam Elsdon Posted November 1, 2009 Share Posted November 1, 2009 I was looking up Air Raid Sirens and came across this, its a Chrysler Air Raid Siren, built in the fifties, its powered by a Chrysler Hemi V8 Firepower engine producing 180 bhp at 4000 RPM and produces 138 dB of noise equivalent to 30,000 watts output at 100 feet. To put that into perspective a Military jet on full reheat puts out a similar level at 75 feet. The recommended safety clear zone in front of the horns (Minimum safe distance) extends to 320 feet when running at full revs. Apparently they can be heard up to 25 miles away, and the sound output clears fog turning it into rain drops! Would make an amusing alternative to the usual stationary engines seen at vintage rallies all three tons of it! Quote Link to comment Share on other sites More sharing options...
Nick Johns Posted November 1, 2009 Share Posted November 1, 2009 A few years ago Robbie Coltrane did a fascinating TV series called "Planes trains & automobiles" it featured a V8 powered air raid siren, they got it running, originally mounted on top of a tall building, remotely controlled, it ran on LPG Quote Link to comment Share on other sites More sharing options...
antarmike Posted November 1, 2009 Share Posted November 1, 2009 I was looking up Air Raid Sirens and came across this, its a Chrysler Air Raid Siren, built in the fifties, its powered by a Chrysler Hemi V8 Firepower engine producing 180 bhp at 4000 RPM and produces 138 dB of noise equivalent to 30,000 watts output at 100 feet.To put that into perspective a Military jet on full reheat puts out a similar level at 75 feet. The recommended safety clear zone in front of the horns (Minimum safe distance) extends to 320 feet when running at full revs. Apparently they can be heard up to 25 miles away, and the sound output clears fog turning it into rain drops! Would make an amusing alternative to the usual stationary engines seen at vintage rallies all three tons of it! Are you sure that is not Raindrips?? Quote Link to comment Share on other sites More sharing options...
FW200 Posted November 1, 2009 Share Posted November 1, 2009 A few years ago Robbie Coltrane did a fascinating TV series called "Planes trains & automobiles" it featured a V8 powered air raid siren, they got it running, originally mounted on top of a tall building, remotely controlled, it ran on LPG Great series Quote Link to comment Share on other sites More sharing options...
Adam Elsdon Posted November 1, 2009 Author Share Posted November 1, 2009 Are you sure that is not Raindrips?? As per your own definition!! Rain drops form by condensing out of a cloud. They have not formed under a tap or a leaky gutter for eaxample, they are drops which never have been drips. Whether you can call water molecules been smashed together by sound waves from an air raid siren "Condensing" is of course the potential subject of another fascinating thread ! :yawn: Quote Link to comment Share on other sites More sharing options...
cpltomo Posted November 2, 2009 Share Posted November 2, 2009 Now thats loud but so cool. Quote Link to comment Share on other sites More sharing options...
Tony B Posted November 2, 2009 Share Posted November 2, 2009 Beltring, 2 am, a sound was heard to rise......... :cool2: Quote Link to comment Share on other sites More sharing options...
R Cubed Posted November 2, 2009 Share Posted November 2, 2009 Are you sure that is not Raindrips?? No no rain splishes............... Quote Link to comment Share on other sites More sharing options...
R Cubed Posted November 2, 2009 Share Posted November 2, 2009 Great series Saw this on the TV so funny look at the expressions on the film crews faces :shake: Mind you it must have been loud. Pardon did you say something. Quote Link to comment Share on other sites More sharing options...
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