Do planes and helicopters have horns as cars do to warn people of there presence ?

Yes, and they have that beep thing that lorries and buses have when they reverse also.

Do planes and helicopters have horns as cars do to warn people of there presence ?
Many helicopters have sirens (they sound like a car alarm chirp) to warn people when they are about to start and to get dumbass people away from the helipad when they are landing.





I%26#039;ve also seen sirens installed on bird dog aircraft that guide water bombers.





Also there are these:





http://upload.wikimedia.org/wikipedia/co...





They are venturis, but make for interesting conversation for the unsavy.
Reply:No


Air traffic control keep aircraft away from each other.


I don%26#039;t think other aircraft would be able to hear a horn.
Reply:No. You wouldn%26#039;t hear it over the noise in the aircraft any way.





But military aircraft do have other ways of announcing their presence. Tracer rounds, air-to-air missiles, guided ordnance, etc. It generally gets the attention of whoever they want to notify.
Reply:At 500mph a horn is not much use !
Reply:Yes, this is the reason for the big lump on top of the 747.


The sound is something like the mating call of the lesser spotted avocet.
Reply:no, they use flashing strobe lights...
Reply:Yes, and all this time you thought it was just geese flying over honking.................lol
Reply:No, radar!



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