AOPA Pilot Magazine - February 2015 - 69
INSTRUMENTS UNIQUE to the diesel engine
include the Compact Engine Display
(center left), also seen on the panel
(above) located behind the right side of
the pilot's yoke. It shows rpm at the top,
load or percent power at the bottom, and
temperatures in the middle for oil, cylinders, and the engine gear case. Above the
co-pilot yoke is the Auxiliary Engine
Display, showing fuel temperature, battery
voltage, and fuel flow. A single power lever
(far left) controls mixture, power setting,
and the constant speed propeller.
its temperature rises, fuel is added, mixes
with the air, and combusts spontaneously.
Power is controlled by the amount of fuel.
To turn Jet-A into a mist, you need a fuel
pump capable of nearly 20,000 pounds per
square inch.
HOW FAST?
So how fast does the Skyhawk fly with only
135 horsepower? Fast enough for a flight
school but slower than an individual owner
might like. Hallaran suggested demonstration settings of 75 percent power, which
resulted in a 5.8-gallon-per-hour fuel flow;
and 65 percent, which burned 4.8 gallons
per hour. That consumption is similar to a
gasoline Rotax engine found in Light Sport
aircraft; with a 160- or 180-horsepower gasoline engine, fuel burns would be closer to
eight and 10 gallons per hour, respectively.
Those gasoline engines weigh from 260 to
295 pounds, depending on the model, while
the CD-135 weighs 295 pounds.
At 75 percent power I saw 109 knots
true airspeed, while at 65 percent the speed
was 98 to 100 knots true airspeed. Spengler
said that to go faster, it is permissible to fly
at a higher power setting than the factory
recommendation. He flew from Texas to
Florida at 8,000 feet using a power setting
of 85 percent, and saw 115 knots true airspeed while burning 6.2 gallons per hour.
He said the engine is approved to fly at up
to 92 percent power for fastest speed, while
lower settings are recommended for economy cruise.
Another diesel engine in the approval
process promises more speed. The FAA
is processing paperwork to approve the
www.aopa.org/pilot AOPA PILOT | 69
http://www.aopa.org/pilot
AOPA Pilot Magazine - February 2015
Table of Contents for the Digital Edition of AOPA Pilot Magazine - February 2015
Contents
AOPA Pilot Magazine - February 2015 - Cover1
AOPA Pilot Magazine - February 2015 - Cover2
AOPA Pilot Magazine - February 2015 - Contents
AOPA Pilot Magazine - February 2015 - 2
AOPA Pilot Magazine - February 2015 - 3
AOPA Pilot Magazine - February 2015 - 4
AOPA Pilot Magazine - February 2015 - 5
AOPA Pilot Magazine - February 2015 - 6
AOPA Pilot Magazine - February 2015 - 7
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AOPA Pilot Magazine - February 2015 - 30
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AOPA Pilot Magazine - February 2015 - 33
AOPA Pilot Magazine - February 2015 - 34
AOPA Pilot Magazine - February 2015 - 35
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AOPA Pilot Magazine - February 2015 - 40
AOPA Pilot Magazine - February 2015 - 41
AOPA Pilot Magazine - February 2015 - 42
AOPA Pilot Magazine - February 2015 - 43
AOPA Pilot Magazine - February 2015 - 44
AOPA Pilot Magazine - February 2015 - 45
AOPA Pilot Magazine - February 2015 - 46
AOPA Pilot Magazine - February 2015 - 47
AOPA Pilot Magazine - February 2015 - 48
AOPA Pilot Magazine - February 2015 - 49
AOPA Pilot Magazine - February 2015 - 50
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AOPA Pilot Magazine - February 2015 - 54
AOPA Pilot Magazine - February 2015 - 55
AOPA Pilot Magazine - February 2015 - 56
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AOPA Pilot Magazine - February 2015 - 63
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AOPA Pilot Magazine - February 2015 - 65
AOPA Pilot Magazine - February 2015 - 66
AOPA Pilot Magazine - February 2015 - 67
AOPA Pilot Magazine - February 2015 - 68
AOPA Pilot Magazine - February 2015 - 69
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AOPA Pilot Magazine - February 2015 - 77
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AOPA Pilot Magazine - February 2015 - 79
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AOPA Pilot Magazine - February 2015 - Cover3
AOPA Pilot Magazine - February 2015 - Cover4
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