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Message
My idea is that the most efficient use of a dual (redundant)
EWP
set-up is that they should be run in PARALLEL with two simple
non
return valves. Yep, sure it's a bit more complicated to
engineer,
but I believe it is worth the extra effort.
I'm betting that no one
will argue the contrary. I think the only problem with parallel is the
packaging. Once I get a big pile of new parts on the floor, I'll have
to spend many hours deciding what the best way to fit them in the cowl will
be. Realistically, nothing is going to get done before December at
the earliest. I will certainly be trying to figure out how to do the
parallel pumps though.
With EWPs, a switching mechanism can be arranged so that the
second
pump will come on and off automatically whenever the
water temp goes over or
under pre-set limits. An ordinary
thermoswitch of the type
used for auto radiator fans - especially the
auxillary air cond fan(s) are
pretty reliable.
What are your thoughts (in 5000
words or less <g>) about using temp to notice the failure of a
pump? In other words, you're flying along with only one pump running, and
it fails. How long do you think it will take before the aux pump will
kick in due to the higher temp? More importantly, what do you figure
the chances of boiling out coolant, or damaging the engine will be before
the aux pump comes online? I'm betting that you and Lynn (who's also been
mighty quiet on this subject) have had seen failures than all the rest of us
combined.
Thanks,
Rusty
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