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Message
Glad to hear you are back flying, Rusty. I
plan on making additional test flights this week myself since I did not get to
make it to SERFI. I almost always accelerate to 120 mph for my climb as
that has previously given the best rate of climb for my somewhat heavy
RV-6A. This new prop and gear box have increased roc by approx 500 fpm
based on the one flight to approx 1500 fpm.
However, with the larger prop I think I need
to do some more testing as a slower speed but faster roc just might be in the
cards.
Well, its clear that a total of 28 sq inches core
inlet is more than adequate for a 13B at cruise around 5200-5400 rpm and 8
gph. My oil and coolant stayed at 165-170 with OAT at 70F. However, when I
bumped the rpm up to 6300-6400 the oil rose to 200F and the coolant to 205F
before stabilizing given me a true airspeed of right at 200 MPH burning 11.8
gph. So It appears I need to open my left core inlet back up a
bit from its current 10 sq inches to approx 18 sq inches. I am going to
try and get the new left duct done before heading to Lake City, Fl for the
Crook's rotary round up.
Hope to see you there. Any chance of you
attending Charlie England's flyin in Mississippi weekend of the 16
Oct?
Ed
----- Original Message -----
Sent: Sunday, October 03, 2004 7:26
PM
Subject: [FlyRotary] First post Ivan
flight
Greetings,
Below is the log from
today. As you can see, I'm not too hopeful that thinner oil will cure
all my oil cooling problems. On the other hand, I'm also generating more
power due to the new inlet, so the oil may have helped more than I'll be able
to measure. The real test will be when I can climb unrestricted to
8k ft or so to see what will happen. Engine sure felt strong today
:-)
Rusty
10-03 04 .5 hours / 32.7 total
Installed the new
rudder and left aileron. Also
fought the leaking oil fitting at the front of the oil cooler. I tried using a seal on it, but that
didn’t work. I ended up taking
the hose off, and inspecting the
sealing surface. It seems the
Earl’s (POS) 45 degree adapter that I used to measure oil pressure was poorly
made. It had a ridge on the
sealing surface, and pressed that into the soft aluminum bung on the
cooler. I spent some time with
fine emery cloth and Scotchbrite polishing both surfaces. Once that was done, I put on a new
seal, and tightened it up. No
leaks!
I took the plane
up for a brief ride, and found there were no problems with the new control
surfaces. This was the first
flight with the new intake inlet arrangement, but I forgot to even look at the
MAP. The plane climbed at 6000
rpm at 100 mph, and something like 2400
fpm on the VSI. I only climbed to
about 2000 ft, so it wasn’t much of a test. Unfortunately, the oil temp was 205 by
the time I got there, so I have little reason to believe that thinner oil is
going to make enough of a difference to keep me from having to make some other
change to the oil cooling arrangement.
I think water is still OK, but no changes will be made until I can do
some real testing. All I really
wanted to do was make a quick local flight over my neighborhood today. Sure are a lot of blue tarps on
roofs. Actual testing can
continue now, with 7.3 more hours to go on the restriction time.
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