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Date: Sun, 05 Apr 2009 13:21:19 -0700
From: Don Wallker <drwalker@gbis.com>
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Subject: Time to report, 3rd flight!
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Test Pilot Tom Porta made his third flight today. He is a high time RV 
driver.  I'm low time and don't want to be a dummy.  Oat 40.  max 
altitude 8500, field elev 5000 no wind day.
               rpm               oil temp     water temp
Take off.  6000 rpm, ,   190-205      182-190
cruise       6000              200                177
max throttle 6800            205                183
MPH at cruise is 163 via GPS.  Dynon reading about 12 mph slower.
Sorry, no Egts or rate of climb.  I am finding that the Egts are in line 
with the 13b and going as high as 1730 during ground testing and not 
what was suggested as maxing out at 1550.  Glad I Jet Coated with the 
2000 degree stuff.  We did get 1675 at 6500 rpm on the 2nd flight.  Egt 
probes in the exhaust tube, 3 inches from the engine. 
Tom says it flys like an RV and is smooth and quiet.  When he made a 
pass, I could only hear the prop until he passed and then the engine 
could be heard, but the prop was still most of it.  Hushpower 2.  He 
didn't play with the mixture much.  Next time he or I will add fuel to 
the mixture to see if the power comes on.
Notes:  When switching fuel pumps, #1 switches fine, #2 takes a few 
seconds to come on, and drops in pressure, so the engine almost drops 
out and then comes back up.  And thats with both on for a few seconds.  
The pumps sound different too. I put diode on the pumps, but that is not 
it.  I'll be getting the new ones from Tracy and changing over.  And 
saving 2 pounds!  Pumps on the fire wall, low on the  left, shielded, 
with a blast tube.
The RPM display is dropping out (going to 0) above 6000RPM and coming 
back on and off.  I used Tracy's fix of a .01uf cap from +12 to ground 
on the EM-2 and it's better, but need more. When warm and throttling 
back, the engine runs rough and pops a little.  More tuning needed, 
probably mode 2. 
As usual, cooling is the main problem.  It's OK now, but when things 
warm it will be too hot.  My configuration is similar to Tracy's RV8 
with the 3 rotor.  I have had a slight improvement with the water by 
narrowing down the duct at the far end (to force more air through the 
front) (no manometer measurements have been taken) and adding smoothing 
panels where the air discharges from the radiator.  I tried turning it 
into a James cowl with outlets on the outside of the cowl, but that made 
it worse.  A lot of time and trouble.  I blocked off the sides of the 
flywheel so no air would blow out on the rad or oil cooler, but no 
difference.  My next plan is to open the bottom of the cowl when the air 
discharges a little to see if there is a difference.  I notice that what 
is working for others is cowl flaps, But there are no pictures.  
Pictures anyone??!!b  I'll also be switching to Maxdatrixes version of 
water wetter this week.  There are a few other ideas too, but that will 
wait until new pumps and this is tried.  If the oil doesn't cool down, 
I"ll add an additional cooler under the redrive (the lines run through 
there now) and build a chin opening  near to the prop to feed it.  My 
existing cooler is a racing one, slightly bigger than the mazda and 
rated for 350 psi.

Don Walker
RV-8 Renesis, EM-2, EC-2, Catto 76/88  1131 LBS  CG center of envelope
Intake tuned to 17.5 in but not as smooth as I would like
exhaust at 24 inches all three tubes.