A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding
From: Ronald P Barrett
Date: 2009 Nov 27, 17:37 -0800
|A number of matters more with Navigator Noonan trying to shoot a below the horizon sun shot from a plane with no astrodome and and a slot-front window in the ITCZ.|
1. In looking at the pictures of the L-10AE, I feel there is no way an aft cabin shot of the sun rise could be accomplished due to the fat wing chord and engine nacelle being in the visual path. Like I said prior one does need to do an engineering study of the visual paths or views possible from all the L-10AE's windows using as best as is known sextant:by a navigator if possible as you need to know what you are looking for. The view of the sun would have been slightly to the left of the flight center line of the flight path of apx 080 degrees. The sun rise azimuth was to be 067 degrees at that time/date.
2. If one studies the front cockpit windows you see that the view from the cockpit seat as Ruth Richter Holden (owner of the current flying L-12A Electra ) stated to me, "Like looking out a mail box slot." That says a lot. I found the sister ship to AE's Electra up at the Canadian Air museum and you can see by their picture details of the cockpit window Noonan might have been sighting through. So he had to have his head way up in the crown of the cockpit area, to get the sextant to be able to sight out over the glare shield and out the bottom edge of the window. HUMM???
3. Upon further analysis: would Noonan have been sighting through the left cockpit window pain? Were the frames in the way? If he could shoot...could he see over the engine nacelle? If so was he shooting through a prop into the sun? What were the real glare/optical problems. They look horrific to me.
4. It needs to be noted shooting an off-the-nose rising sun shot from 5,000ft altituude would give a Nav a dip correction of nearly seventy-miles. So without the correction Noonan would have thought he was apx 70 miles nearer Howland than he actually was. At a higher altitude it would have been even greater; so when possible was a let down initiated?
5. Looking at the picture does any one think we need to look at the visual/sighting paths possible for Noonan's sun-rise celestial observations?
Thanks, Ron Barrett, USAF Ret Nav & President of Air Force Navigators Observers Association (www.afnoa.org)
--- On Fri, 11/27/09, Gary LaPook <glapook---.net> wrote:
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