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Date: Wed, 06 Oct 2004 07:11:15 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: Joseph M Berki <Joseph.M.Berki@grc.nasa.gov>
Subject: Re: [FlyRotary] #$!%@$ temperatures still high
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Hi Steve,
         I think you are close.  Are both evaporators the same size?  You 
could try using two of the larger cores.  Do you have enough outlet 
area?  Try to copy Ed's duct shape in front of the cores, it may help air 
pass through all of the core instead of building up and not going through.

Joe Berki
Limo EZ

At 07:17 PM 10/5/2004 -0400, you (Steve Brooks) wrote:
>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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