Perry Mick wrote:

Had nothing else to do this morning so climbed to 8500 feet and took some
WOT data.
It was 34 F at the surface (160'), I think it's 3.5 deg/1000 feet? Which
gives about 4 F at 8500 feet.

Manifold pressure gauge read 22.5 inch mercury.  5400 RPM.

Indicated airspeed 125 knots. With the 2%/1000' rule for TAS, this gives a
TAS of 146 knots.
Can't locate the temperature correction right now, maybe you have it.

GPS GS was 114 knots one way and 158 knots the other way for average of 136
knots.  Didn't do the three-way method.

My highly accurate measurement of fuel burn (sight gauges):  5 gallons in
0.7 hour for 7.14 gph.

Thanks for the data Perry. What is next for improvements to the ducted fan/
engine system? Tighter cowl or new motor mount?

Paul Lamar

I still have that turbo engine on the test stand but keep finding things to do on
my plane so no progress.  I recently added a ram air snout to feed air directly
into the airflow sensor, 3" x 3" square inlet.  I think it helps a little. Also replaced
my oil cooler with the overhauled cooler and remote mounted the oil filter
for future cowl streamlining.

First I need a new intake manifold, which will then allow the tighter cowl and
the new engine mount.

Here is a 33" diameter fan/duct on the drawing board, which would allow 6500
RPM vs 5500 now with my 37.5" fan.  Can't do this of course until the above
items are done first.  Hopefully the thinner and smaller duct would have less
drag.
--
Perry J. Mick
Duckt N7XR
http://www.ductedfan.com

Looks good Perry.

Tom Kendall should have some intake manifold castings anyday now.

Paul Lamar

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