nuckolls.bob(at)aeroelect
Guest
|
 Posted: Sat May 12, 2012 4:35 pm Post subject: Cessna Alternator OV protection |
 |
|
At 01:31 PM 5/12/2012, you wrote:
>On 5/12/2012 7:36 AM, Robert L. Nuckolls, III wrote:
>Ov protection has been a staple feature
>of alternator systems on TC aircraft for
>over 40 years and continues to this day.
Pretty close to precisely forty years for Cessna singles... added in
the '72 model year.
That sounds right. I was in the right seat of Ken Razak's
station wagon and he was driving us toward Hornbeak
TN for field tests on a truck accident that occurred
just west of there. I was sketching various options
for the lowest parts-count ov trip circuit to go between
the field control switch and the regulator's field relay.
I had joined Ken full time several years earlier
in '69 but still had a lot of conversation with the guys
at the Cessna Pawnee Street Plant (SE models).
Somewhere in southern Missouri I settled on the
circuit at:
http://tinyurl.com/7g7mn6l
When we got back to the shop several days later,
I brassboarded the circuit and tested it in a
cardboard box "environmental chamber" using
dry ice and/or a 100W lightbulb to get the
temperatures I wanted. Satisfied with the stability,
I took the circuit out to Cessna. The head electron-
herder (who shall remain nameless) decided that it
"wasn't what he was looking for." But a few months
later, Hopkins Mfg in Emporia began supplying the
"three-fuse firecracker" to the Pawnee Plant aircraft.
That was the first . . . and last outside
work I did for Cessna S.E. plant. Beech turned out
to be a whole lot nicer to work with!
That field trip was something of a milestone. This
was the first time we built some speed distance
measurement equipment synchronized to a pair of
DIY motor drive cameras to record truck dynamics
driving over the same course as the accident.
S/D data was radioed from the truck to a receiver
in the back of the station wagon. The radios were
salvaged from a 2 meter repeater project. The
cameras were 35mm Leicas that had nice cylindrical
film wind knobs I could drive with rubber band belts.
Data was displayed on nixie tubes and photographed.
http://tinyurl.com/7252gx6
http://tinyurl.com/84cxusk
Even built my own photo-detectors to count the
slots in the S/D wheel.
An the head cheese electron-herder probably never
did come to understand why I left Cessna!
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
