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Message
Guys,
Following this
thread a few days late has me convinced some of you may be trouble shooting the
wrong thing. Thanks Chris for a great explanation on how the Vernatherm
works. Additionally, I had heard years ago that vernatherms do fail but go
often unnoticed. The comment implied that the oil all goes to the cooler
when failed. I'm not sure this is correct in light of Chris' detailed
explanation but a failure would certainly explain a dramatic reduction in
cooling on a hot day.
However, several
testimonials to cold weather engine running have the oil warm to vernatherm set
point (180) and then sit there. My airplane does this as well.
If you are
succeeding in adjusting your oil temp with blank off plates, etc on a cold day,
my impression is that you have oil going through the cooler. This is not
the design intent. It should have no flow or in light of Chris' post, it
should have very little flow.
Before I'd go
reducing your winter cooling air across the oil cooler, I'd thoroughly
convince myself that my vernatherm was working properly.
Larry
Henney
N360LH
PS: On the
other hand it is awfully tempting to add the blank off plate anyway as a means
to further reduce cooling drag. My gosh these planes roar in the cold
air! :)
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