Three Jet Performance Spreadsheet

Summary: Max vertical takeoff weight 5000 pounds, 500 MPH initial cruise, 1000 pounds people and baggage, 1400 pounds maximum fuel, 2500 mile range @ 50k altitude with reserve.

Input Variables and Assumptions:

 

125 AREA WING DRAG; Root Chord = 45", Tip Chord = 30"
125 AREA WING LIFT
18 AREA HORIZONTAL STAB
32 AREA VERTICAL STAB
220 FUSELAGE WETTED AREA
10 MAST WETTED AREA
60 BOOM WETTED AREA
10 SPINNER WETTED AREA
0.007 COEFF DRAG AIRFOIL
0.0035 COEFF DRAG WETTED
0.2 WING INTERFERENCE DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.2 JET NACELLE INTERFER DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.2 FUSE & PYLON INTERF DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.1 TAIL INTERFERENCE DRAG - FLAT PLATE EQUIV. - SQ.FT.
0.95 WING EFF
40 SPAN - FT.
40 ROTOR DIA. - FT.
40 AREA OF BLADE
80 RPM - ROTOR
3 NUMBER OF ENGINES
0.7 SPEC FUEL CONS- # FUEL / HR / # THRUST
100 PERCENT OF MAX CRUISE THRUST
5000 WEIGHT GROSS
3600 WEIGHT LANDING W/O FUEL

Calculated Results:

 

ALTITUDE 0 15 30 40 45 50
RHO 0.00238 0.0015 0.000889 0.000582 0.000459 0.000361
V SOUND FPS 1116 1057 995 972 972 972
VEL FPS 551 615 692 746 760 740
VEL MPH 375 418 471 508 517 503
CL WING 0.11 0.14 0.19 0.25 0.30 0.40
PROFILE HP 1078 942 798 654 546 396
INDUCED HP 15 21 31 44 55 71
ROTOR HP 112 98 83 68 57 41
TOTAL HP 1205 1061 911 765 657 508
DRAG-THRUST 1202 949 724 564 475 377
MPG 2.76 3.90 5.76 7.97 9.64 11.81
L/D 4.16 5.27 6.91 8.86 10.52 13.25
BSFC - EQUIV. 0.70 0.63 0.56 0.52 0.51 0.52
RANGE 734 1036 1530 2156 2560 3136
TIP SPD ADV FPS 719 782 860 914 928 907
REY/FT. 3507855 2667535 1951464 2103136 1209686 941674

 

12.80 ASPECT RATIO
2.98 FLAT PLATE EQ. AREA W/O ROTOR
0.31 FLAT PLATE EQ. AREA ROTOR
3.28 TOTAL FLAT PLAT EQ. AREA
1257 ROTOR SWEPT AREA
168 ROTOR TIP SPEED - FPS
3.98 ROTOR DISK LOADING #/sq. ft.
40.00 WING LOADING #/sq. ft.

 

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