Hi
Dennis, I like your results but have a couple of questions.
Where
will the “permanent system” components be installed?
Wing-root? Cabin? FFW? Combination?
Do
you have an estimated total weight of the temporary system
components?
Jeff
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Dennis
Haverlah
Sent: Monday, July 27, 2009 7:46 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Hot weather flight with Water Miisters
for Oil
Cooling
Yesterday it was
Hot Again in
Central Texas - my EM-2 showed 103 deg F. I flew my RV-7A to see how
well
my temporary water spray system would work. I turned on the water
spray
just as I started my take-off. Water and oil temps at take-off were in
the
upper 170 F area. I normally take-off and climb at 100 to 120 K/h to
about 1000 feet before my oil temp approaches 220 F. I than throttle
back
to 22 - 24 inches MP and continue my climb under reduced power. The
water usually gets to 200 F when the oil is at 220. (My personal
limits
are 220 F-Oil and 212 F -water.) The test set-up provided water
spray
on the oil cooler only and no water spray on the water radiator.
During the climb the water and oil temps. tracked each other within 2
deg F.!!
This meant the oil temp was reduced by at least 20 deg. F. I left
the engine at full throttle and climbed to 4000 feet while flying at
115 to 120
kts. indicated. As I reached 4000 ft the water and oil were at 210 -
211
F and climbing very slowly.
Reviewing some of my other high temp. day flights it looks like I
reduced my
oil temp. 20 + degrees with the water mist spray. Time to take-off and
climb was 5:10 minutes. I only used 8-9 oz. of water during the
climb!
Attached are pictures of the water system I used for the test. In the
future I may add one or two additional mister nozzles 3 to 4 inches to
the
right of the 3 misters used on this test. (See attached
pictures) The additional mister nozzles would give me better
coverage of the right side of the oil cooler and also cool some of the
water
radiator surface.