The only comparable data that I have was as follows:
20 minute ground at between 2500 and 4000rpm, CHT stabilised at 94C, OAT
12C.
If adjusted for a 30C OAT, then CHT would be 116C.
At 2500rpm, oil temp was cooling down through 109C, or 127C adjusted to
30C.
There was a moderate wind from behind and <1 hour on the engine, so
still tight.
Cooling modified thus:
Duncan McF.
----- Original Message -----
From: Remi Guerner
To: Europa-List Digest Server
Sent: Thursday, September 10, 2009 8:31 AM
Subject: Europa-List: Congrats to Jeff,Cooling feedback for Bud
Hi all,
I am resending this message to clarify the temperature units:
I have been following the cooling discussion with great interest as I
have done my own modifications to the cowling over the years with good
but not 100% satisfactory results.
As for most Rotax equipped Europas, the main issue is overheating on
the
ground at high ambient temperatures. Worst case is when you land, stop
for 5 minutes, start the engine for another flight and have to hold
for
a long time due to traffic before being cleared for take off,
especially
if there is no wind or you cannot face into it.
An effective validation test for any cooling improvement should be:
ambient temperature 30-35 degrees Celsius (90 Fahrenheit, to be
adjusted depending on where
you fly), no wind. After a short flight, taxi to the parking area, and
run the engine at high idle (2000-2200 RPM). Note the CHT every
minute.
I would consider this test to be 100% satisfactory if I get the CHT
STABILIZED not higher than 110 deg C (230 F). Up to now I have not
managed to pass this test successfully at ambient temperatures above
23 deg C (67 F).
Could those who have done their own cooling modifications try this
test
and let us know the results?
Best regards
Remi Guerner
F-PGKL, Monowheel, 912S, 696 hours
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