NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Re.Sextant Shots in Flight
From: Gary LaPook
Date: 2009 Dec 25, 22:20 -0800
From: Gary LaPook
Date: 2009 Dec 25, 22:20 -0800
Regarding refraction through the airplane's windshield see my prior post a: http://www.fer3.com/arc/m2.aspx?i=111306&y=200912 gl NavList@fer3.com wrote: > > Before you take-off you'll have to calibrate the refraction error of > the front window of the aircraft on the ground (unless you're going-up > in a WWII bomber or transport w/an astrodome). These were calibreted > at the factory and a table of Perspex (plexiglass) calibrations can be > found in older Air Almanacs. One way to do this is to shoot Polaris > from the airplane while it is on the ground and taking into account > your other errors, compare your calculated Latitude reading w/ the > posted airfield Latitude. > > All this is unnecessary if you use a periscopic sextant. > (BTW I have one w/mount in fully functioning condition for sale). > Email me at jujutsu@hotmail.com) > Robert Swartz > ---------------------------------------------- > [Sent from archive by: jujutsu-AT-hotmail.com] > > -- > NavList message boards: www.fer3.com/arc > Or post by email to: NavList@fer3.com > To , email NavList+@fer3.com -- NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList+@fer3.com
