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    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
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