Comments inserted;
Lincoln Ross wrote:
I wish I had a graphics program I actually knew, installed in this
computer. Oh well. The possibilities....
Ahem, to be more relevant but perhaps still silly, I wonder if anyone
has tried using the tailboom for an antenna? How about the wing spar for
the ground, i.e. negative, power wire? For reference, for another
project I measured a carbon tow at 25ohms/ft. Not sure which type.Not
sure how many tows in one of those spars.
Not a silly question - but carbon is dissipative by nature, so
definitely no. The electrical losses would be huge.
Seems to me those dedicated wires are just extra insulation. For that
matter, you could drop the insulation on the negative wire. One could
use one big wire, as someone else mentioned. And a little wire for the
signal. If you're worried about reliability, one big wire makes it
easier to have redundant pins. If you use double pins for every
function, that's 12 pins per wing. One big connector, perhaps? Also, if
you're worried about reliablility, make sure you use very careful strain
relief. Probably using really fine stranded wire would help with the
reliability as well, but I don't know where to get it, particularly on a
budget.
Again, I challenge anyone to demonstrate a win or loss becuase they
carried slightly more or less mass equating to approximately an ounce.
The drive to have the lightest mass is not warranted except as an
excersise to show it can be lighter. Other systems are being compromised
for what? It just won't contribute to a win or a longer flight given
current L/D's. As it stands now there exists viable conector options in
very small form factors that allow each of the 4 servos in an F3x wing
to have PWR/GND along with the SIG.
One known reliability issue is for those systems that the enduser has to
literally connect and disconnect connector systems by hand.
As far as strand count goes versus flexibility, 7 strands in 24 or 22awg
is more than adequate in this scenario. I build plenty of plug-and-play
harnesses for IMAC-style giant gassers that employ 7-9 strand that have
experienced zero fatigue-failure. This environment offer significantly
more chances of fatigue-failure scenarios than a sailplane ever will.
The gains of using more strand count for the same awg is only slightly
better series resistance, but at a significant greater cost. It is
available (I spin-twist 3 or more leads together to produce various
harness specifications) for thsoe environments that are brutal
vobration-wise, along with TEFLON jacketing.
--
Simon Van Leeuwen
RADIUS SYSTEMS
PnP SYSTEMS - The E-Harness of Choice
Cogito Ergo Zooom
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