Paul,.   I am really taking a shine to this motor, another hour today
and ran out of fuel. Have to await further deliveries.  1, Cooling.
Changed back to water and Glycol from Evans after input from the group.
Todays OAT temp were cool at 28 degrees C or I think that is about 80
plus F.  The water would not go over 130 degrees with the cowl flaps
shut!!   The oil was  153 degrees whereas with the evans the oil tracked
the water nearly identically.  So it appears that the water/ Glycol is
running 20 degrees cooler.  Whatever it is I now have a problem with
being too cool!  The engine ran at 5600 rpm at 23 MP and 1720 EGT. It
is obvious that my prop is too big as max take off rpm was 6800 and the
EGT went to 1850, which to me means that the engine is working too
hard.  Prop is 70 “ dia by 90 degrees pitch.   What props are others
running??  anyone ?  As I said the water was 130 degrees, the oil 153
degrees and oil pressure was 86 psi .  GS was a little slow at 120 (
should be 135), so all points to the prop.  Have to do a max speed in
level flight before the prop is altered.  So to sum up, the cooling
works too well thanks to a bloke about Paul’s size and his book on
cooling. The motor runs very well especially considering the poor bloke
who had a Lyc fail after take off at Perth a few days ago in a Glasair.
Not pretty at all.   So far the figures.

Neil.

Block off some of that huge rad intake scope :) That will make it faster.

I forgot what your gear ratio is? If it is 2.85:1  then yes the pitch
may be too much.
If it is 2.17:1  6800 RPM is about right.

Measure the thickness of the prop tips from the end back about 2 inches and
tell me what it is. Who made the prop?

Dive the plane and see if the RPM increases. You cannot hurt a rotary.
If the RPM does not increase the prop tip drag is going transonic.
Thinner tips help.

Paul Lamar

Paul,
        yes may have to block off the front. It is the standard 20% of the
cooler area, but PWR did assure me that their radiator would definitely
work.  AS usual I didn't believe them.  It is a wonderful mistake, besides
it is not hot yet. Will decide after 45 degrees C hits us. My gear ratio is
2.85
Fuel delivered today, so will fly more tomorrow, mainly on the prop to see
what I can get out of it performance wise.

Neil.

A 1 degree F increase in ambient temperature is a 1% reduction in cooling.

What are the dimensions of the rad?

Don't forget to dive and watch the RPM.

Paul Lamar
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