Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Noise and Distance

  • 06-04-2010 4:56pm
    #1
    Overheal
    Registered Users, Registered Users 2 Posts: 86,729 ✭✭✭✭


    Just to clear something up, I wanted to ask some people who might be a bit more knowledgeable in here: At about what distance can you hear an Average Helicopter?

    Specifically Im talking about a modern Apache Longbow (...) But I just want to know objectively what the minimum distance you would need to hear it distinctly.


Comments

  • #2
    View Profile
    Registered Users, Registered Users 2 Posts: 1,133 ✭✭✭View Profile


    Many different factors involved.

    Weather, terrain, helicopter height, its speed, its direction of travel, etc.

    Lets say average heli flys around at 2,000 ft. Maybe you would hear it 1-2 miles before it passes over you. Maybe even less depending on the helicopter design.


  • #3
    airvan
    Closed Accounts Posts: 167 ✭✭airvan


    I would deduce you are thinking of 'that' video or similar. But to answer your question, it depends. When the original Garda helicopter, an Ecureuil hovered over your house at 2am you knew all about it. But the more recent EC135 is considerably quieter. The Apache is also known to be a quieter helicopter than many others, relatively speaking. Distance isn't the only factor, height also helps.

    But I think it's fair to say the people featured in those gun camera shots were quite aware of the helicopters in the vicinity. What they couldn't know was whether or not they were being targeted. With Longbow they can be kept in sight even though the Apache could be facing away from the target and the helcopters could be quite a distance away.


  • #4
    St. Leibowitz
    Registered Users, Registered Users 2 Posts: 349 ✭✭St. Leibowitz


    Agree with the previous responses ... it is really a "how long is a piece of string" type question. There are a huge number and range of variables. But, my assumption is that Apache traffic over any incident in Iraq is frequent and persistant, and not "out of the ordinary", and most importantly, the victims had no reason to suspect that they were being targetted.


  • #5
    Overheal
    Registered Users, Registered Users 2 Posts: 86,729 ✭✭✭✭Overheal


    Thanks guys, just trying to discern facts and fiction. Whether they were aware or responding to the AH-64 was one of those factors.


  • #6
    castie
    Hosted Moderators Posts: 3,807 ✭✭✭castie


    airvan wrote: »
    I would deduce you are thinking of 'that' video or similar. But to answer your question, it depends. When the original Garda helicopter, an Ecureuil hovered over your house at 2am you knew all about it. But the more recent EC135 is considerably quieter. The Apache is also known to be a quieter helicopter than many others, relatively speaking. Distance isn't the only factor, height also helps.

    But I think it's fair to say the people featured in those gun camera shots were quite aware of the helicopters in the vicinity. What they couldn't know was whether or not they were being targeted. With Longbow they can be kept in sight even though the Apache could be facing away from the target and the helcopters could be quite a distance away.

    What video?


  • Advertisement
  • #7
    Danbo!
    Closed Accounts Posts: 3,942 ✭✭✭Danbo!


    castie wrote: »
    What video?

    Referring to this thread


Advertisement