AOPA Turbine Pilot Magazine - December 2019 - T-13
speed, fuel flow, and true airspeed are
at their optimum values. That's where
we leveled off north of Blackhawk's
home base at the Waco, Texas, airport.
Blackhawk Regional Sales Manager Chris
Dunkin was in the right seat showing
me the ropes. For the first demonstration we took a look at all-out maximum
cruise performance, pushed the power
right up to the -67A's ITT redlines, and
waited for the gauges to settle down. The
results were 92 percent torque; propellers at 1,500 rpm; 220 KIAS (a hair's
width below barber pole); and an outside air temperature of minus-12 degrees
Celsius. The combination of which gave
us a whopping 350 KTAS on a total fuel
burn of 840 pph, or 63 gph per engine.
That's why Blackhawk likes to call
the King Air 300 conversion "the fastest
King Air on the planet."
Cruising at maximum ITT is a great
way to realize jet-like speeds, but can be
hard on engine life. For increased engine
service life, Blackhawk's airplane flight
That's why Blackhawk likes to call the King
Air 300 conversion "the fastest King Air on
the planet."
manual supplement says to use ITTs set
at 820 degrees as recommended maximum cruise power settings. Page through
the AFM and you'll come up with 325
knots for maximum cruise at FL280,
using 77-percent torque, and ISA +20
degree conditions, burning 367 pph/55
gph per side.
So much for the book numbers. But
when Dunkin and I set power at 820
degrees ITT and 90-percent torque, we
came up with a 347-knot true airspeed
on a fuel burn of 420 pph (about 63 gph)
per side. That's 22 knots faster than
Blackhawk's own published numbers-
and only three knots slower than a cruise
at ITT redline. What gives?
A note in the manual gives the explanation. The published cruise speeds are
based on the torque values of an engine
near the end of its service life, or at its
3,600-hour recommended time between
overhaul (TBO). By that time all the accumulated wear and tear on an engine will
have reduced its maximum power output.
New engines can produce more torque
than shown in the AFM tables and still
remain within ITT and Ng (gas generator) limits. This means that owners of
new Blackhawk engines can set higher
than published torque values and could
easily turn in higher than published true
airspeeds by as much as 10 knots. In other
words, Blackhawk's maximum cruise
performance numbers are conservative.
Between the AFM and actual flight
data, you get the idea that once above
12,000 feet there's no maximum cruise
aopa.org/pilot AOPA PILOT | T-13
http://www.aopa.org/pilot
AOPA Turbine Pilot Magazine - December 2019
Table of Contents for the Digital Edition of AOPA Turbine Pilot Magazine - December 2019
Contents
AOPA Turbine Pilot Magazine - December 2019 - Intro
AOPA Turbine Pilot Magazine - December 2019 - Cover1
AOPA Turbine Pilot Magazine - December 2019 - Cover2
AOPA Turbine Pilot Magazine - December 2019 - Contents
AOPA Turbine Pilot Magazine - December 2019 - 2
AOPA Turbine Pilot Magazine - December 2019 - 3
AOPA Turbine Pilot Magazine - December 2019 - 4
AOPA Turbine Pilot Magazine - December 2019 - 5
AOPA Turbine Pilot Magazine - December 2019 - 6
AOPA Turbine Pilot Magazine - December 2019 - 7
AOPA Turbine Pilot Magazine - December 2019 - 8
AOPA Turbine Pilot Magazine - December 2019 - 9
AOPA Turbine Pilot Magazine - December 2019 - 10
AOPA Turbine Pilot Magazine - December 2019 - 11
AOPA Turbine Pilot Magazine - December 2019 - 12
AOPA Turbine Pilot Magazine - December 2019 - 13
AOPA Turbine Pilot Magazine - December 2019 - 14
AOPA Turbine Pilot Magazine - December 2019 - 15
AOPA Turbine Pilot Magazine - December 2019 - 16
AOPA Turbine Pilot Magazine - December 2019 - 17
AOPA Turbine Pilot Magazine - December 2019 - 18
AOPA Turbine Pilot Magazine - December 2019 - 19
AOPA Turbine Pilot Magazine - December 2019 - 20
AOPA Turbine Pilot Magazine - December 2019 - 21
AOPA Turbine Pilot Magazine - December 2019 - 22
AOPA Turbine Pilot Magazine - December 2019 - 23
AOPA Turbine Pilot Magazine - December 2019 - 24
AOPA Turbine Pilot Magazine - December 2019 - 25
AOPA Turbine Pilot Magazine - December 2019 - 26
AOPA Turbine Pilot Magazine - December 2019 - 27
AOPA Turbine Pilot Magazine - December 2019 - 28
AOPA Turbine Pilot Magazine - December 2019 - 29
AOPA Turbine Pilot Magazine - December 2019 - 30
AOPA Turbine Pilot Magazine - December 2019 - 31
AOPA Turbine Pilot Magazine - December 2019 - 32
AOPA Turbine Pilot Magazine - December 2019 - 33
AOPA Turbine Pilot Magazine - December 2019 - 34
AOPA Turbine Pilot Magazine - December 2019 - 35
AOPA Turbine Pilot Magazine - December 2019 - 36
AOPA Turbine Pilot Magazine - December 2019 - 37
AOPA Turbine Pilot Magazine - December 2019 - 38
AOPA Turbine Pilot Magazine - December 2019 - 39
AOPA Turbine Pilot Magazine - December 2019 - 40
AOPA Turbine Pilot Magazine - December 2019 - 41
AOPA Turbine Pilot Magazine - December 2019 - 42
AOPA Turbine Pilot Magazine - December 2019 - 43
AOPA Turbine Pilot Magazine - December 2019 - 44
AOPA Turbine Pilot Magazine - December 2019 - 45
AOPA Turbine Pilot Magazine - December 2019 - 46
AOPA Turbine Pilot Magazine - December 2019 - 47
AOPA Turbine Pilot Magazine - December 2019 - 48
AOPA Turbine Pilot Magazine - December 2019 - T-1
AOPA Turbine Pilot Magazine - December 2019 - T-2
AOPA Turbine Pilot Magazine - December 2019 - T-3
AOPA Turbine Pilot Magazine - December 2019 - T-4
AOPA Turbine Pilot Magazine - December 2019 - T-5
AOPA Turbine Pilot Magazine - December 2019 - T-6
AOPA Turbine Pilot Magazine - December 2019 - T-7
AOPA Turbine Pilot Magazine - December 2019 - T-8
AOPA Turbine Pilot Magazine - December 2019 - T-9
AOPA Turbine Pilot Magazine - December 2019 - T-10
AOPA Turbine Pilot Magazine - December 2019 - T-11
AOPA Turbine Pilot Magazine - December 2019 - T-12
AOPA Turbine Pilot Magazine - December 2019 - T-13
AOPA Turbine Pilot Magazine - December 2019 - T-14
AOPA Turbine Pilot Magazine - December 2019 - T-15
AOPA Turbine Pilot Magazine - December 2019 - T-16
AOPA Turbine Pilot Magazine - December 2019 - 49
AOPA Turbine Pilot Magazine - December 2019 - 50
AOPA Turbine Pilot Magazine - December 2019 - 51
AOPA Turbine Pilot Magazine - December 2019 - 52
AOPA Turbine Pilot Magazine - December 2019 - 53
AOPA Turbine Pilot Magazine - December 2019 - 54
AOPA Turbine Pilot Magazine - December 2019 - 55
AOPA Turbine Pilot Magazine - December 2019 - 56
AOPA Turbine Pilot Magazine - December 2019 - 57
AOPA Turbine Pilot Magazine - December 2019 - 58
AOPA Turbine Pilot Magazine - December 2019 - 59
AOPA Turbine Pilot Magazine - December 2019 - 60
AOPA Turbine Pilot Magazine - December 2019 - 61
AOPA Turbine Pilot Magazine - December 2019 - 62
AOPA Turbine Pilot Magazine - December 2019 - 63
AOPA Turbine Pilot Magazine - December 2019 - 64
AOPA Turbine Pilot Magazine - December 2019 - 65
AOPA Turbine Pilot Magazine - December 2019 - 66
AOPA Turbine Pilot Magazine - December 2019 - 67
AOPA Turbine Pilot Magazine - December 2019 - 68
AOPA Turbine Pilot Magazine - December 2019 - 69
AOPA Turbine Pilot Magazine - December 2019 - 70
AOPA Turbine Pilot Magazine - December 2019 - 71
AOPA Turbine Pilot Magazine - December 2019 - 72
AOPA Turbine Pilot Magazine - December 2019 - 73
AOPA Turbine Pilot Magazine - December 2019 - 74
AOPA Turbine Pilot Magazine - December 2019 - 75
AOPA Turbine Pilot Magazine - December 2019 - 76
AOPA Turbine Pilot Magazine - December 2019 - 77
AOPA Turbine Pilot Magazine - December 2019 - 78
AOPA Turbine Pilot Magazine - December 2019 - 79
AOPA Turbine Pilot Magazine - December 2019 - 80
AOPA Turbine Pilot Magazine - December 2019 - 81
AOPA Turbine Pilot Magazine - December 2019 - 82
AOPA Turbine Pilot Magazine - December 2019 - 83
AOPA Turbine Pilot Magazine - December 2019 - 84
AOPA Turbine Pilot Magazine - December 2019 - 85
AOPA Turbine Pilot Magazine - December 2019 - 86
AOPA Turbine Pilot Magazine - December 2019 - 87
AOPA Turbine Pilot Magazine - December 2019 - 88
AOPA Turbine Pilot Magazine - December 2019 - 89
AOPA Turbine Pilot Magazine - December 2019 - 90
AOPA Turbine Pilot Magazine - December 2019 - 91
AOPA Turbine Pilot Magazine - December 2019 - 92
AOPA Turbine Pilot Magazine - December 2019 - 93
AOPA Turbine Pilot Magazine - December 2019 - 94
AOPA Turbine Pilot Magazine - December 2019 - 95
AOPA Turbine Pilot Magazine - December 2019 - 96
AOPA Turbine Pilot Magazine - December 2019 - 97
AOPA Turbine Pilot Magazine - December 2019 - 98
AOPA Turbine Pilot Magazine - December 2019 - 99
AOPA Turbine Pilot Magazine - December 2019 - 100
AOPA Turbine Pilot Magazine - December 2019 - 101
AOPA Turbine Pilot Magazine - December 2019 - 102
AOPA Turbine Pilot Magazine - December 2019 - 103
AOPA Turbine Pilot Magazine - December 2019 - 104
AOPA Turbine Pilot Magazine - December 2019 - 105
AOPA Turbine Pilot Magazine - December 2019 - 106
AOPA Turbine Pilot Magazine - December 2019 - 107
AOPA Turbine Pilot Magazine - December 2019 - 108
AOPA Turbine Pilot Magazine - December 2019 - 109
AOPA Turbine Pilot Magazine - December 2019 - 110
AOPA Turbine Pilot Magazine - December 2019 - 111
AOPA Turbine Pilot Magazine - December 2019 - 112
AOPA Turbine Pilot Magazine - December 2019 - Cover3
AOPA Turbine Pilot Magazine - December 2019 - Cover4
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