2-Place Personal Air Vehicle Performance

Note: Program solves for speed based on given horsepower available at each altitude and the given inputs.

Also note how the mpg and range increase at the higher altitudes with minimal effect on speed (requires a pressurized cabin).

 

2-Place PAV, 200 HP Turbo Diesel, Max Cruise Speed

Calculated Results:

ALTITUDE 0 7.5K 15K 17.5K 25K 30K
RHO 0.00238 0.001898 0.001496 0.001378 0.001065 0.000889
V SOUND FPS 1116 1087 1057 1047 1016 995
VEL FPS 300 322 347 345 339 328
VEL MPH 204 219 236 235 230 223
CL WING 0.43 0.47 0.52 0.59 0.82 1.08
PROFILE HP 166.85 165.43 163.57 148.08 107.70 81.62
INDUCED HP 11.41 13.30 15.65 17.09 22.56 27.91
ROTOR HP 21.75 21.27 20.79 18.83 13.74 10.46
TOTAL HP 200.00 200.00 200.00 184.00 144.00 120.00
DRAG-THRUST 319.39 297.03 275.41 254.85 203.52 175.15
MPG 15.04 16.18 17.45 18.86 23.61 27.43
L/D 5.64 6.06 6.54 7.06 8.84 10.28
RANGE 798 858 926 1000 1253 1455

 

Input Variables and Assumptions:

25   AREA WING DRAG - SQ. FT.
32   AREA WING LIFT - SQ. FT.
11   AREA HORIZONTAL STAB - SQ. FT.
25   AREA VERTICAL STAB - SQ. FT.
141   FUSELAGE WETTED AREA - SQ. FT.
12   MAST WETTED AREA - SQ. FT.
48   BOOM WETTED AREA - SQ. FT.
18   SPINNER WETTED AREA - SQ. FT.
0.012   COEFF DRAG ROTOR
0.008   COEFF DRAG AIRFOIL
0.004   COEFF DRAG WETTED
0.25   WING INTERFERENCE DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.25   COOLING DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.5   HUB & PYLON INTERF DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.13   TAIL DRAG MISC - FLAT PLATE EQUIV. - SQ.FT.
0.92   WING EFF
24   SPAN - FT.
28   ROTOR DIA. - FT.
21   AREA OF BLADES - SQ.FT.
160   RPM - ROTOR
0.87   PROP EFFICIENCY
200   HORSEPOWER AVAILABLE @ SEA LEVEL
0.42   BRAKE SPECIFIC FUEL CONSUMPTION- LB FUEL / HP / HR
1,800   WEIGHT GROSS - LBS
1,500   WEIGHT LANDING - LBS

 

Fixed Calculations:

18.00   ASPECT RATIO
2.49   FLAT PLATE EQ. AREA W/O ROTOR - SQ. FT.
0.37   FLAT PLATE EQ. AREA ROTOR - SQ. FT.
2.87   TOTAL FLAT PLAT EQ. AREA - SQ. FT.
616   ROTOR SWEPT AREA - SQ. FT.
235   ROTOR TIP SPEED - FPS
2.92   ROTOR DISK LOADING LB/SQ.FT. @ 0 MPH & GROSS WT
49.24   WING LOADING WITH ROTOR CARRYING SOME WEIGHT LB/SQ.FT.

 

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