nuckolls.bob(at)aeroelect
Guest
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 Posted: Thu Jul 10, 2014 12:30 pm Post subject: Tablets as flight instruments |
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At 05:40 PM 7/9/2014, you wrote:
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I think you'll be unhappy with a panel mounted Ipad, they will heat
soak from the sun in a hurry and simply turn off. I use one however
and love it, but I stow it out of the sun (and thieves) view when
parked and just set it on my legs in flight.
FWIW
Tim
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Tim's comments highlight the need to differentiate the two
energy sources of potential overheating. Given that these devices
draw about 1A at 5.0V (unless charging a dead battery), the
power going into internal heat-gain is only 5 watts. Bolt
a 5w resistor to a similarly sized sheet of aluminum, power
it up, an the piece of aluminum will get noticeably warmer
than ambient . . . but you can comfortably hold it. And so it would
be with your tablet. It is, after all, a hand-held device.
Even when charging a dead battery (perhaps 10W total draw)
a majority of the additional 5W goes into electrical->chemistry
conversion with perhaps a watt or less showing up as more
heat on the case.
But lay that same piece of aluminum out in the sun and
temperature rise is another matter entirely. It seems
well advised to have the handy device attached to the
panel only while in use . . . and perhaps stored in your
flight bag in the shade . . . or completely out of the
airplane.
To be sure, there are many examples of commercial-off-
the shelf products having truly amazing capability
to augment a pilot's tasks in the cockpit. But approach
with caution with an understanding that capability does
not correlate with reliability. If the desired capability
offers any risk for venturing into situations where
functionality is NECESSARY, then do your FMEA and ASSUME
the critter is going to go T.U. The reason for failure doesn't
matter. Have a Plan-B.
Bob . . .
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