Hey Tom;
We looked at this scenario when we were laying out our Legacy, and
determined that it was packing too much into a cowling that already had a
large intercooler, and a turbo that was guaranteed to be radiating about
1400 to 1900 degrees of heat.  So, the question was, where to put a
radiator, oil cooler, etc. outside of the cowling?  We settled on a P-51
scoop for both, and built it exactly like the original, hoping for a
little thrust return.  Difference was, we kept the radiator out of the
fuselage, because we didn't want a leak in the cockpit at 20+K feet, with
all that entails.  We are also looking at installing a hot water heating
system, with valves both in and out for the very same reasons.  So, what
we have left is, the engine, intercooler, turbo, and whatever goes on the
firewall, with a lot of air going through, to hopefully keep everything
happy.  The flaps on the scoop should enable us to keep temps under
control, a' la P-51, so we'll see.

Greg Ward
Lancair Legacy N178RG, Still in progress


----- Original Message ----- From: "Thomas Giddings"
<tom@midwestaviation.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, March 24, 2011 8:59 PM
Subject: [FlyRotary] intersting video


Here is a youtube engine test run of an LS1 V8. Watch it long enough to
see how the dual radiators are plumbed. This system for engine cooling
includes two radiators which appear to be in series. It  seems to be going
from the thermostat housing to the top of the first radiator then is taken
out the bottom of the first one and crosses over to number two at the top
inlet and back out the bottom into the pump and back through the block
.They are both dual pass radiators . They feed this air from two outside
the cowl scoops. Bud Warren claims this cools very well. In fact he claims
it is the only way to cool the 300HP LS1 V8's . I wanted to original
install a LS3 into my Questair, but could quite get it stuffed in there .
http://www.youtube.com/watch?v=CUSbOAZRRtg. If this link does not work
search youtube for Franks Bearhawk Test run. Incidently they claim they
need 1256 Sq In of radiator surface to keep the V8 running at 190 in
cruise and 200 max in the climb. Also if you to geared drives yahoo forum
there is a very interesting read on the subject on cooling requirements
for the LS1.

Tom Giddings
VP Avionics Sales
MIDWEST AVIONICS
200 Hardy Roberts Dr
PO Box 219
West Paducah,KY 42086
877-904 9966
Cell; 727 858-1772
FAX:270 744 3466
tom@midwestaviation.net
Online Store
www.midwest-avionics.com

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