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Great to see you back in the air, Dave. Cooling
would appear to be doing fine. 50" of boost will put it to the test
{:>)
Ed
----- Original Message -----
Sent: Sunday, August 26, 2007 11:35
PM
Subject: [FlyRotary] N4VY flys
again
After a year and a half of deployment and assorted upgrades, my
RV-6 finally got back in the skys. And she did great.
The most
significant upgrade was the new cowl and new larger radiator. (see
picture). Some of you may have participated in the 'smiley' cowl vs.
'OH' cowl debate. Smiley cowl won on the basis of aesthetics, but there
was a concern that that boundary layer issues (and the fact that the intake is
several inches back from the prop) would prevent adequate cooling. The
other concern of mine was exit air balance between coolant and oil. Both
issues seemed to not be a significant factor. Oil and water temps now
were essentially the same, with the oil just slightly warmer. Temps for
both peaked at about 150, despite the mid 80's ambient temp and a warm-soaked
engine (I am living at a tie-down now adays). I limited my MAP to 30"
and was at 26" for most of the flight (at 6500'), but those temps should allow
continuous power well into the mid 30's for MAP.
I made what I
thought was a light weight and well designed cowl flap integrated into the
radiator mount (see open/closed pictures), but as was my prior experience, the
cowl flap did not have much authority to affect the cooling system. The
only difference today was that my temps are borderline too cold, instead of
borderline too hot.
I am expecting some increased cooling drag from
the BAI (big ass intake), but at least it was not remarkable enough to notice
on this flight. More accurate data to follow.
Other upgrades
included new nav antenna, marker antenna, subdued satellite antennas, muffler,
new interior, and about 50 smaller items and I was pleased with all. In
fact, my biggest issue with todays flight was that Sirius radio does not come
in very well while upside down and the MP3 player is the best option for
aerobatics. Maybe I should have gotten XM, but the Sirius radios all come
detachable so that I can easily use the same radio in my car and plane.
Any day you fly instead of build is a great day :-)
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
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