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David,
What was the voltage issue ?
Steve
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of DaveLeonard
Sent: Tuesday, October 05, 2004 8:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: #$!%@$ temperatures still high
Steve, sorry to hear that your temps are so high. One thing I notice about
your description that is different from what I experience is the speed with
which your temps seem to change. My system seems to have significantly more
inertia.
It is possible to me to overheat the coolant, but I really have to be
climbing hard or running a lot of boost. On the first take off of the day I
have several minutes of steep climbing (6-7000') before I need to level out
some and pick up speed. If the engine is already hot I have to be careful
from the start. Likewise when coming down. If I do get my coolant up to
220, it takes a full five minutes of low power descent to get it back into
the low-normal range.
I wonder what is different between our systems - volume of coolant?
Whatever it is, this may a clue for you.
I would definitely fix the mixture. I had that problem as well and it was
greatly improved with detailed and repeated narrow width (mode 2)
programming. Then I found my voltage problem and fixed it all.
JMHO,
Dave Leonard
I flew the Cozy this after noon, and was very disappointed in the
temperatures. The OAT was 81, and the coolant read 225 on the temperature
gauge, and the oil climbed slowly to 207 peak. The coolant did come down
about 10 degrees when I throttled back at pattern altitude, but
leveled off
there.
When I throttled back on approach the coolant was about 180 and oil 190 on
touchdown.
It appears to me that I don't have enough sq in of inlet area. I
do have a
P51 style scoop that I can bolt on, and try, but I don't have
allot of faith
that it will solve the problem. Tomorrow, it is suppose to be
cooler, about
55 or so in the A.M., so maybe I'll try the other scoop with the cool
temperatures just to see what happens. If the temperatures are low, I may
fly for an hour or more, just to test some other systems.
My next plan is to cut off the 2 12 sq in armpit scoops and
enlarge them to
25 sq in. I'll then remove the oil cooler from the main scoop, which will
give the A/C evaporator cores about 22 sq in of additional inlet
area. I'll
feed the oil cooler from one of the armpit scoops. The other armpit scoop
feeds the intercooler and engine inlet air.
That is, unless someone has a better idea.
I have a couple of other nagging issues:
1) I seem to be running rich. I turned the fuel pressure down
some (30 PSI
on my gauge (don't know if it's accurate)). That helped, but running both
fuel pumps makes the engine run very rich at full power. Turning off one
pump increases power and smoothness. At an idle, 1000-2000 RMS, if I shut
off the main fuel pump, the engine smoothes out, and gain a little rpm,
before running out of fuel.
2) For whatever reason the "coil test" has stopped working. I used to be
able to go to the "B" controller, and do the coil test to check
the leading
or trailing coils. That doesn't work, and if I turn it to off (I'm using
the ignition switch), it keeps on running. Used to kill the
engine before.
I'm not sure what this is, and haven't really done any testing yet.
Steve Brooks (praying for cold weather)
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