2+2 Place Personal Air Vehicle Performance

Military 1200 HP Gas Turbine Version w/ 45' Wingspan & Rotor Diameter


  • 1200 HP Gas Turbine Engine
  • 45 ft Wing Span & Rotor Diameter
  • 4500 lb Gross Weight
  • 1500 lb Empty Weight
  • 1500 lb Useful Load
  • 1500 lb Fuel
  • 4 Place

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).

Performance Calculation for Max Speed

Calculated Results:

Altitude 0 10K 20K 30K 35K 40K 45K
Air Density 0.00238 0.001756 0.001267 0.000889 0.000736 0.000582 0.000459
Vel (ft/s) 469 468 465 458 451 437 410
Vel (mph) 319 318 316 311 307 298 279
CL 0.08 0.14 0.22 0.35 0.45 0.62 0.93
Profile HP 993.72 726.26 513.82 344.79 273.30 196.88 127.69
Induced HP 13.26 18.02 25.14 36.37 44.57 58.15 78.70
Rotor HP 193.03 141.10 99.86 67.07 53.22 38.42 25.04
Engine HP Req'd 1200.00 885.38 638.82 448.24 371.09 293.45 231.43
Engine HP Available 1200.00 885.38 638.82 448.24 371.09 293.45 231.43
Total Drag 1195.71 885.01 642.76 457.75 384.50 313.65 264.03
MPG 3.66 4.95 6.82 9.57 11.40 13.97 16.60
L/D 3.76 5.08 7.00 9.83 11.70 14.35 17.04
Range 1081 1460 2011 2824 3361 4121 4895
Rotor Flate Plate 0.86 0.86 0.86 0.87 0.87 0.87 0.87
Total Flat Plate 4.64 4.64 4.64 4.65 4.65 4.65 4.65

 

Input Variables and Assumptions:

AWD= 104 AREA WING DRAG -SQ FT; R=55", T=12.3"
AWL= 118 AREA WING LIFT - SQ FT
AHS= 10.5 AREA HORIZONTAL STAB - SQ FT
AVS= 16 AREA VERTICAL STAB - SQ FT
FW= 190 FUSELAGE WETTED AREA - SQ FT
MW= 5 MAST WETTED AREA - SQ FT
BW= 40 TAIL BOOM WETTED AREA
LGW= 20 LG NACELLE WETTED AREA
SPW= 4 SPINNER WETTED AREA - SQ FT
CDR= 0.012 COEFFICIENT OF DRAG (ROTOR)
CDA= 0.008 COEFF DRAG AIRFOIL
CDW= 0.004 COEFF DRAG WETTED
WDM= 0.6 WING + LG DRAG MISC - FLATE PLATE SQ FT
CD= 0.3 COOLING DRAG - FLATE PLATE SQ FT
FDM= 0.6 FUSELAGE, PYLON, HUB DRAG MISC- FLATE PLATE SQ FT
TDM= 0.2 TAIL DRAG MISC - FLATE PLATE SQ FT
VISC= 3.74E-07 ABSOLUTE VISC COEFF- slug/(ft)(s)
MU= 0.92 WING EFF
SPN= 45 SPAN - FT.
RD= 45 ROTOR DIA. - FT.
AB= 50 AREA OF BLADES - SQ FT
RPMR= 100 RPM - ROTOR
P.E.= 0.85 PROP EFF.
HP SL= 1,200 HORSEPOWER AVAILABLE @ SEA LEVEL
BSFC= 0.45 BRAKE SPECFIC FUEL CONSUMPTION
WTG= 4,500 WEIGHT GROSS - LBS
WTE= 3,000 WEIGHT LANDING - LBS

 

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