My guess is that the actual 'worst case' in auto use is not at high
throttle but at idle on a blistering hot day, stranded in traffic, with the AC
cranked full blast. THAT is when you have the minimum pump pressure and
need the minimum resistance to flow.
Yeah, I thought Tracy and yourself
were using the smaller hoses with the pretty AN fittings, and there is no
doubt that Tracy at least has been successful (and I'm sure you'll be right
behind him :-), but I still stand by my theory that if the automakers use no
less than 1.25" hoses, then why would should we when we have a higher heat
rejection requirement.
Now maybe we can get away with less, but
then the argument that the EWP can't possibly have enough flow because of our
higher heat output is invalid. Maybe we can get away with smaller hoses, or
maybe we can get away with an EWP, but can we get away with smaller hoses AND
an EWP???
Because I knew that many were watching
closely as mine was the first known aircraft use of an EWP (some hoping for
success and many expecting failure), I decided that 1.25" hoses were
mandatory. I'd originally started my installation with 1" hose, but changed my
mind on this before I was even completed that part of the
installation.
Todd
If I'm not mistaken, Tracy is
using 3/4" hoses??? I've been using AN12 hoses, with two evap
cores in series, and there has never been a question of cooling the
water on the RV-3, even in severe climb tests. The antique
mechanical pump does have a lot of muscle, and might be making up
for it though, and I still haven't found a way to test the EWP by
itself in flight.