The Advanced Turboprop engine features an industry-best 16:1 overall pressure ratio, enabling the engine to achieve as much as 20 percent lower fuel burn and 10 percent higher cruise power
compared to competitor offerings in the same size class.
At max cruise power
, the XP140 mod has a still-air range of 825 miles at 12,000 feet while the OEM -114A it replaces will stretch to 900 miles.
That's a lot slower than the airplane's lowest published cruise power
settings, reproduced in the table at right.
At 7000,1 set cruise power
and settled back to enjoy the flight when I was handed over to Atlanta Approach.
The petrol engine is optimally sized to provide the cruise power
at its most efficient operating point, resulting in improved fuel efficiency overall.
Stein put his plane on high cruise power
and headed south as fast as he could.
Morgan claims it has cracked one of the technical problems inherent in other fuel cell engines by de-coupling cruise power
from acceleration allowing for a tiny 25kw cell rather than the usual 100kw.
Since pressurization is drawn from the engines, at cruise power
settings less air pressure is available, and the system is subject to pressure variations.
At cruise power
, the PC-21 reaches a speed of 300 knots (against the PC-9's 290) thanks to its five-blade propeller, "but our aim is to reach 330 knots", said Tyndall.
The ATP features an industry-best 16:1 overall pressure ratio (OPR), enabling the engine to achieve as much as 15% lower fuel burn and 10% higher cruise power
compared to competitor offerings in the same size class with better time between overhaul (TBO) and class-leading performance retention.
You may not want to slow to your holding speed, but otherwise you're going nowhere at cruise power