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Re: Periscopic Sextant w/ Mount
From: Gary LaPook
Date: 2009 Nov 24, 21:51 -0800
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From: Gary LaPook
Date: 2009 Nov 24, 21:51 -0800
Ronald, maybe you can answer a question for me. I have several
Kollsman periscopic bubble sextants and an MA-2 hand held Kollsman
bubble sextant. These all have the same averagers that run for two
minutes. I also have an MA-1 pendulous mirror hand held Kollsman
sextant that has the same averager except that the averager only runs
for one minute. The MA-1 manual states that it should run for only one
minute so my MA-1 averager works properly.
My question, why was the MA-1 averager set to run for only one minute while all the others run for two minutes. My understanding is that the two minute averaging period was chosen to span more that one normal oscillation period of the plane so as to be able to cancel the normal accelerations during the oscillation period. So, why only one minute for the MA-1 since it was used in the same type aircraft with the same oscillation period?
gl
Ronald P Barrett wrote:
My question, why was the MA-1 averager set to run for only one minute while all the others run for two minutes. My understanding is that the two minute averaging period was chosen to span more that one normal oscillation period of the plane so as to be able to cancel the normal accelerations during the oscillation period. So, why only one minute for the MA-1 since it was used in the same type aircraft with the same oscillation period?
gl
Ronald P Barrett wrote:
--
Robert, Yes AFNOA could use your sextant and mount. It would be used on one of the Museum exhibits we are working. if you want to donate this our, 501c.19 (vet non-profit) organization is EIN 74-219046-501.c.19. The address to send it to would be:
AFNOA Historian;Ronald P. Barrett
1406 South Lexington St.
Holden, MO
64040-1636
Phone (816)732-5802
We appreciate your offer for this donation. Our very Best to you,
Ronald P.Barrett, President, Air Force Navigators Observers Association
--- On Fri, 11/20/09, NavList@fer3.com <NavList@fer3.com> wrote:
From: NavList@fer3.com <NavList@fer3.com>
Subject: [NavList 10797] Periscopic Sextant w/ Mount
To: NavList@fer3.com
Date: Friday, November 20, 2009, 5:46 PM
I have a fully functioning Kollsman aircraft periscopic sextant w/ the rare azimuth ring hull mount with sealing shutter for pressurized aircraft. If anyone can use this complete instrument, please email me. Thanks,
Robert Swartz
jujutsu@hotmail.com
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