snips...

Chuck,

Hope you don't mind giving some details on your

installation. I was wondering

mostly about the radiator, specifically: How big is your

water radiator? How

big is the air inlet, and how well does it work? I'm

struggling to get all

the heat exchangers to fit under the cowl of my chosen project ;-)

Thanks,

Monty

Here is a picture of Chuck's rad taken at Copper State 2000
unless he has changed it.
I have some pictures of the opening as well but I am sure he
has cleaned it up
since then. I have to give Chuck a economic perseverance
award as he got a bad gear box
from Ross and went ahead and bought a new gearbox from Tracy
to replace it.
Anybody want a slightly defective Ross gear box cheap? :-)>

Paul Lamar

My radiator core size is 10.5 x 20.5 x 2.5 inches, custom made by Griffin.
It was ordered as the biggest size I could fit behind the 13B, angled
against the firewall like Jess Myers RV6 with Chevy V6. I quickly abandoned
that location as I could not keep it cool even at idle speed, so I moved it
up front. Like my oil cooler, it cools fine in weather up to 90F but if I
ever get more power (by raising RPM), I think it will only cool at full
power up to 80F ambient. I can fly if it is over 90F but I have to cut back
on power above about 500ft AGL after full power takeoff to keep temp in the
green. I am looking at replacing it with a bigger unit, since there is
enough room up front. I do not have a photo handy, but the current inlet
under the spinner looks like a "smile" 12 in. across and 4 in. tall in the
center, tapering to the sides. I also want to try moving the inlet forward
to just behind the prop, it is now about 6 in. behind the prop.
Fitting the heat exchangers and hoses is only half the battle; then you get
to fit proper ductwork to make it work! 8-)

snips...

Chuck Dunlap

It makes me happy to see guys are starting to note the OAT when discussing
cooling problems. In the first three years of this NL nobody every noted
OAT. Rad temp - OAT is ALL that counts.

Chuck I think you should move the opening down a bit as well. Also think about
adding a cowl flap(s) of some kind even one flap on each side of the nose 
gear if necessary.

Here is a very early picture of Chucks rad air inlet. Right after he got it
flying.


Paul Lamar
 
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