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    Re: Bygrave and Chichester
    From: Hewitt Schlereth
    Date: 2009 Aug 2, 13:08 -0400

    Then there's Captain Sumner's landfall by single LOP in 1837. The
    extract from his log is terse and tense - maybe 400 words. Gripping.
    Used to be in older editions of Bowditch. I don't find it though in my
    1977.  -Hewitt
    
    On 8/2/09, glapook@pacbell.net  wrote:
    >
    >  also see:
    >
    >  http://www.geocities.com/fredienoonan/chichester.html
    >
    >  gl
    >
    >
    >
    >
    >  On Aug 2, 5:57 pm, "glap...@pacbell.net"  wrote:
    >  > Here are links to prior posts on Chichester's navigational procedures:
    >  >
    >  > http://fer3.com/arc/m2.aspx?i=108625
    >  >
    >  > http://fer3.com/arc/m2.aspx?i=108623
    >  >
    >  > gl
    >  >
    >  > On Aug 2, 5:35 pm, "glap...@pacbell.net"  wrote:
    >  >
    >  > > "It was a fourteenth the size of the smallest compulsory landfall made
    >  > > by an
    >  > > aeroplane. From New Zealand it presented a target half a degree in
    >  > > width. And my
    >  > > compass, recently swung twice on that bearing, had varied 9 degrees
    >  > > during the
    >  > > interval; further, it was nothing to drift 30 degrees in a stiff wind.
    >  > > And since
    >  > > an error in the course of only 5 degrees meant passing the island 50
    >  > > miles away,
    >  > > it was plain I could only depend on the sun to find it.
    >  >
    >  > > "Instead of heading direct for the island, I altered course 10 degrees
    >  > > for a
    >  > > point 90 miles to the left of it. Flying towards this imaginary point,
    >  > > I must
    >  > > observe the sun carefully until it gave me the exact bearing of
    >  > > Norfolk Island
    >  > > on my right, and showed me to be on the line through point and island.
    >  > > I must
    >  > > then immediately turn to the right and head direct for the island.
    >  >
    >  > > "I must make no mistake and turn neither a minute too soon nor a
    >  > > minute too
    >  > > late."
    >  >
    >  > > Seaplane Solo, Francis C. Chichester, 1934.
    >  >
    >  > > The offset had nothing to do with a possible error in the sextant
    >  > > reading which
    >  > > he needed to be accurate enough to put him on the LOP through Norfolk
    >  > > close
    >  > > enough to spot the island. The offset related to the possible error in
    >  > > the DR
    >  > > after traveling almost 600 miles.
    >  >
    >  > > The book is great, very exiting and well written
    >  >
    >  > > Also see the topic Single LOP landfall procedure at my 
    website:http://www.geocities.com/fredienoonan/
    >  >
    >  > > gl
    >  >
    >  > > On Aug 1, 6:26 pm, Tom Sult  wrote:
    >  >
    >  > > > Gary....
    >  > > > Sounds like a great day at the Aerodrome!  I also am a pilot, and
    >  > > > would love a copy of the book.  If you can email it to ts...@mac.com
    >  > > > Thanks.
    >  > > > Thomas A. Sult, MD
    >  > > > IntegraCare Clinicwww.icareclinics.com
    >  > > > ts...@charter.net
    >  >
    >  > > > On Jul 31, 2009, at 8:59 PM, Gary LaPook wrote:
    >  >
    >  > > > > My interest in the Bygrave was triggered by my reading Sir Francis
    >  > > > > Chichester's account of flying a Moth, open cockpit single engine
    >  > > > > airplane across the Tasman Sea in 1931 doing celnav on the way to find
    >  > > > > two tiny islands where he could refuel, each leg about 500 nautical
    >  > > > > miles. Today, at Headcorn Aerodrome in England, I had the
    >  > > > > opportunity to
    >  > > > > fly the same type of aircraft and my admiration for Chichester
    >  > > > > increased
    >  > > > > ten fold. It is a very light aircraft so it is bounced around a lot my
    >  > > > > even the lightest turbulence. The controls are very sensitive,
    >  > > > > especially in pitch, so it takes a lot of concentration to keep the
    >  > > > > plane flying straight and level. It is also very noisy and the wind
    >  > > > > blows vigorously through the cockpit. I don't know how Chichester
    >  > > > > managed to do it, flying the plane, shooting sun lines with  a marine
    >  > > > > sextant, doing the computations with the Bygrave (holding it
    >  > > > > horizontally so it didn't get blown out of the cockpit), estimating
    >  > > > > drift angle, and plotting the LOPs and the drift lines. I recommend
    >  > > > > this
    >  > > > > book, Seaplane Solo, to everybody and I can email a copy to anyone who
    >  > > > > is interested.
    >  >
    >  > > > > gl
    >  >
    >  >
    >  >
    >
    
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