Noise

[grey matter]

This may be an old topic I'm touching on, but would anyone be able to point me in the right direction for some info/studies etc on heli noise i.e. sound footprints, different types of a/c etc??
Thanks in advance for your help
gm

[belly tank]

Grey Matter,

We did a comprehensive noise study when we got our heliport approved, i have lots of data!!....

what specifics do you require etc

pm me and i can help if you wish

Belly tank