nuckolls.bob(at)aeroelect
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 Posted: Mon Nov 07, 2016 5:06 am Post subject: Soldered lap splice has more resistance? (CORRECTION) |
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At 01:53 PM 11/6/2016, you wrote:
| Quote: | --> AeroElectric-List message posted by: "jonlaury" <jonlaury(at)impulse.net>
Thank you all.
This battle with VW is far from over and I'm sure they are going to try to hang their incompetent cap on my repair. For fun, I computed the resistance values of my two 1/2" splices from Alec's conductivity specs... total resistance added to the circuit is like 3.5 x 10 to -8, or about 1 billionth of an Ohm.
My dog lying on the seat above the splice contributes a greater delta T to the wire than does the 'resistance' of the solder. [Laughing]
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A similar issue arose with a client a few
years back who called to ask about 'heat sink
grease' to put under a transistor being
replaced. He didn't have any 'legacy' products
purported to offer exceptional thermal
conductivity but needed to expedite the
repair.
I suggested E6000 . . . just glue the puppy
down. He was worried about the relatively low
conductivity . . . I reminded him that the
two mating surfaces were nearly flat . . . i.e.
the gaps to be filled were probably under .001
inches. The conductivity of air (no grease at
all) is a whole lot LOWER than just about
anything else he might choose. Even tho
the non-traditional filler had 'unimpressive'
numbers, they were a whole lot better than
air. Further, because the gap was so thin,
the difference between E6000 and the best money
could buy was probably impossible to measure.
A suggestion . . . if the discussion with
this particular dealer continues, show
him a copy of the solder-sleeve catalog
page/specs. If it's good enough for a
military airplane, it probably suffices
for a VW.
Bob . . . [quote][b] [quote][b]
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