Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Fatal interaction betweeu yacht and ferry.
    From: Paul Hirose
    Date: 2007 May 08, 16:42 -0700

    glapook@PACBELL.NET wrote:
    >
    > I don't think most sailors realize how much size matters when it comes
    > to radar reflectors and may be tempted to "just get the slightly
    > smaller one." Since the echo varies with the fourth power of the size
    > a small change in size  will make a large increase in echo strength.
    > Changing the size by 19% changes the echo by a factor of two since
    > 1.19 is the fourth root of two.
    
    On the other hand, isn't it true that detection range varies with the
    fourth root of the radar cross section? If so, the detection range of
    the reflector alone would be proportional to the linear size of the
    reflector.
    
    --
    I block messages that contain attachments or HTML.
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site