4-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).

 

4-Place PAV, 400 HP Turbo Diesel, Max Cruise Speed

Calculated Results:

ALTITUDE 0 7.5K 15K 17.5K 25K 30K 35K
RHO 0.00238 0.001898 0.001496 0.001378 0.001065 0.000889 0.000736
V SOUND FPS 1116 1087 1057 1047 1016 995 983
VEL FPS 349 376 406 404 401 394 378
VEL MPH 237 256 276 275 273 268 257
CL WING 0.28 0.30 0.34 0.37 0.51 0.65 0.88
PROFILE HP 345.25 343.62 341.48 311.39 234.38 186.38 136.06
INDUCED HP 13.34 15.53 18.24 19.87 25.94 31.58 39.78
ROTOR HP 41.42 40.85 40.28 36.75 27.68 22.04 16.16
TOTAL HP 400.00 400.00 400.00 368.00 288.00 240.00 192.00
DRAG-THRUST 548.66 509.60 471.71 435.44 343.79 291.17 242.91
MPG 8.76 9.43 10.19 11.04 13.98 16.50 19.78
L/D 5.10 5.49 5.94 6.43 8.14 9.62 11.53
RANGE 956 1029 1112 1205 1526 1802 2159

 

Input Variables and Assumptions:

45   AREA WING DRAG - SQ. FT.
56   AREA WING LIFT - SQ. FT.
11   AREA HORIZONTAL STAB - SQ. FT.
30   AREA VERTICAL STAB - SQ. FT.
188   FUSELAGE WETTED AREA - SQ. FT.
13   MAST WETTED AREA - SQ. FT.
64   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
0.3   WING INTERFERENCE DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.5   COOLING DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.5   HUB & PYLON INTERF DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.15   TAIL DRAG MISC - FLAT PLATE EQUIV. - SQ.FT.
0.92   WING EFF
32   SPAN - FT.
34   ROTOR DIA. - FT.
26   AREA OF BLADES - SQ.FT.
132   RPM - ROTOR
0.87   PROP EFFICIENCY
400   HORSEPOWER AVAILABLE @ SEA LEVEL
0.42   BRAKE SPECIFIC FUEL CONSUMPTION- LB FUEL / HP / HR
2,800   WEIGHT GROSS - LBS
2,200   WEIGHT LANDING - LBS

 

Fixed Calculations:

18.29   ASPECT RATIO
3.27   FLAT PLATE EQ. AREA W/O ROTOR - SQ. FT.
0.45   FLAT PLATE EQ. AREA ROTOR - SQ. FT.
3.72   TOTAL FLAT PLAT EQ. AREA - SQ. FT.
908   ROTOR SWEPT AREA - SQ. FT.
235   ROTOR TIP SPEED - FPS
3.08   ROTOR DISK LOADING LB/SQ.FT. @ 0 MPH & GROSS WT
43.28   WING LOADING WITH ROTOR CARRYING SOME WEIGHT LB/SQ.FT.

 

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