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: Borrowed Bygrave
    From: Francis Upchurch
    Date: 2016 Jan 15, 04:14 -0800

    Hi David, just lost the first attempt to email you!

    Not sure if you saw my various postings 2009-2013?

    I was lucky to find an original 1920s 11A on ebay for about £200 back then (worth a lot more now!) Perfect working order. Just needed replacement of felt friction pads).

    Far too precious for the wet bouncing boat, so I built a couple of copies, the first based on Gary's, the second a near perfect , authentic looking replica using scales by Wayne Harrison. Both work perfectly and give 1-2' accuracy. 

    The precious original occassionally comes out to play in the dry warm cabin of my home study. It's finest hour was a re-enactment of the famous (infamous?) Chichester Tasman sea flight , using the original nav data from his book. Gary did it first and I copied him (thanks again Gary!) . Remarkably, we both got identical results to Chichester! 

    I now use the Bygrave replica for all my routine LOPs (now also the BN which is faster, easier and nearly as accurate!) . I use the Fuller 2 for lunars etc if they require 4-7 figure accuracy. My latest Mini Fuller 2 is based on the Otis King format and has cosines in red added to the sine scale).

    I recommend cylindrical slide rules as easy to build with limited craft type skills and very accurate. I am now looking at the wonderful Margetts tables for lunars. Joy!

    Best wishes

    Francis



    File:



    File:



    File:



    File:
    f3-sliderulebuild111113.docx

       
    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