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: Need dip-throw a rock?
    From: Frank Reed
    Date: 2011 Jun 22, 21:17 -0700

    Tom you asked:
    "For a relatively higher bridge would you expect a larger or a smaller
    error."

    The same! It's a simple proportionalty: dip=4*time (dip in minutes of arc, time in seconds). So think about it: if you have a tenth of a second error in the fall time, you get an error of 0.4' in the dip, no matter how high you are. Eventually, though, at seriously high altitudes, any dropped object, even a nicely aerodynamic spike of depleted Uranium (everybody should keep a few handy), will be significantly affected by air resistance, and the simple proportionality rule will no longer apply. I would like to experiment with this, but based on calculations, I think you can trust the rule up to about 200 feet with a two-inch diameter, round, fairly dense rock.

    -FER


    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]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