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1. 10:12 PM - Diesel (teamgrumman@AOL.COM)
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I just finished reading an article on the Diamond DA42 Twin Star
Standard fuel capacity: 52 gallons
TBO: 1000 hrs
Climb rate at 104 knots: 800 fpm
Cruise Speed @ 80% power @ 10,000 feet: 156 knots TAS on 6.3 gph (each
engine) or 12.6 gph.
- - - At the current cost for Jet A at Auburn $4.20/gal, that is
an hourly cost, for fuel, of: $52.92/hr
Cruise Speed @ 60% power @ 10,000 feet: 138 knots TAS on 4.4 gph (each
engine) or 8.8 gph.
- - - At the current cost for Jet A at Auburn $4.20/gal, that is
an hourly cost, for fuel, of: $36.96/hr
Cruise Speed @ 50% power @ 10,000 feet: 127 knots TAS on 3.6 gph (each
engine) or 7.2 gph.
- - - At the current cost for Jet A at Auburn $4.20/gal, that is
an hourly cost, for fuel, of: $30.24/hr
Useful load (as tested): 985 lbs. (this is the useful load AFTER they
get a gross weight increase approved. The actual useful load, on the
plane as tested, was
Price as tested: $487,212
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Let's look at my Tiger for a comparison.
Standard fuel capacity: 52 gallons
TBO: 2000 hrs
Climb rate at 104 knots: 1200 fpm
Cruise Speed @ 80% power @ 10,000 feet: 152 knots TAS on 13.8 gph.
(over redline)
- - - At the current cost for Jet A at Auburn $3.85/gal, that is
an hourly cost, for fuel, of: $53.13/hr
Cruise Speed @ 60% power @ 10,000 feet: 145 knots TAS on 10.3 gph.
(2700 rpm)
- - - At the current cost for Jet A at Auburn $3.85/gal, that is
an hourly cost, for fuel, of: $39.65/hr
Cruise Speed @ 50% power @ 10,000 feet: 132 knots TAS on 8.2 gph.
(2550 rpm)
- - - At the current cost for Jet A at Auburn $3.85/gal, that is
an hourly cost, for fuel, of: $31.57/hr
Useful load (as tested): 980 lbs.
Price as tested: $90,000
=========
So, for roughly 50 to 75 cents per hour operating costs disadvantage, I
can fly about roughly the same or better cruise speed. For a "Price as
tested" difference: $397,000, I can fly at $50.00/hr (for fuel) for
over 7,900 hours. At an average use of 140 hours per year, that's 56
years of flying.
True, I don't have a glass cockpit, leather interior, ice protection,
or even IFR capable. But, then, who cares?
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