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    Re: Bygrave and Chichester
    From: Gary LaPook
    Date: 2009 Aug 2, 08:57 -0700

    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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