SAWE Report - Cal Poly San Luis Obispo

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0.06 0.05 Drag Coefficient 0.04 0.03 0.02 Induced Drag 50,000 ft Maneuver Weight Trim Drag 0.01 Wave Drag Parasite Drag 0 0 0.5 1 1.5 2 2.5 3 Mach Figure 5.13 - Drag Build-Up at 50,000 ft, Mach 1.6, Maneuver Weight, and 5% Static Margin 33
6 Propulsion In developing the propulsion system for the Vendetta, the RFP specifications of supersonic cruise and stealth are the driving factors for the propulsions system. Due to the stealth criteria the fan blades of the engine must remain hidden which drives the engine placement inside the airplane. That combined with the supercruise criteria leads to four major aspects of the propulsion system: the Engine, Inlets, S-ducts and Nozzles. 6.1 Engine Selection The RFP specifies that the airplane should perform the mission with adequate installed thrust. A Low-Bypass-Ratio Turbofan (LBR-TF) or a Turbojet (TJ) engine may be used to perform the mission. Equations are provided for creating an engine deck, they are as follows: LBR-TF: TJ: ρ Tdry = 0.9 TSL −dry (0.88 + 0.24 ABS( M − 0.6) )( ) ρSL 2 ρ 0.8 Twet = TSL −wet (0.94 + 0.38 ABS( M − 0.4) )( ) ρ 1.4 0.8 ρ Tdry = 0.9 TSL −dry (0.907 + 0.262 ABS( M − 0.5) )( ) ρSL 2 ρ 0.8 Twet = TSL −wet (0.954 + 0.38 ABS( M − 0.4) )( ) ρ SL 1.5 0.8 However an installed engine deck for a LBR-TF with an axisymmetric center body inlet and a mixed flow ejector nozzle was supplied with the RFP. Since it included physical dimensions and fuel flow values the RFP engine deck was used instead of the above equations. The RFP engine specifications are shown in Table 6.I. Table 6.I - Engine Specifications of RFP Supplied Engine Engine and Nozzle Length Propulsion System Length Fan Face Diameter Maximum Diameter Weight with Nozzle SL 310 inches (787 cm) 425 inches (1080 cm) 50 inches (127 cm) 65 inches (165 cm) 7200 pounds (3266 kg) The engine supplied by the RFP includes fuel flow and thrust data for part power, idle power, and military power. All engine data supplied by the RFP is corrected to sea level and a Mach number of zero. Therefore, every value for thrust and fuel flow at each altitude and Mach 34
Page 1 and 2: SAWE Paper No. 3232 Category No. 10
Page 3 and 4: Table of Contents Abstract_________
Page 5 and 6: List of Figures Figure 1.1 - Design
Page 7 and 8: Figure 13.4 - Rectilinear Vision Pl
Page 9 and 10: Nomenclature AIAA American Institut
Page 11 and 12: α Angle of Attack, degrees, rad.
Page 13 and 14: Table 1.II - Summary of Design Requ
Page 15 and 16: Figure 1.3 - F-15 Strike Eagle F-11
Page 17 and 18: Table 1.III - Comparison of the F-1
Page 19 and 20: Many of the equations buried in the
Page 21 and 22: 3 Configuration The current configu
Page 23 and 24: Another problem arises from the 20
Page 25 and 26: • Span = 54.7 ft • m.a.c. = 32
Page 27 and 28: 4 Stealth Considerations As mention
Page 29 and 30: Table 4.I - Common Ground Radars Ra
Page 31 and 32: 30 20 10 0 -10 -20 -30 -40 -50 1 GH
Page 33 and 34: 5 Aerodynamics The major aerodynami
Page 35 and 36: 1 GHz. 40º LE Sweep 10 GHz. 40º L
Page 37 and 38: 5.3 Wing Thickness The effect of wi
Page 39 and 40: 5.4 Airfoil The NACA 65A-003 airfoi
Page 41 and 42: 1 Section Lift Coefficient 0.9 0.8
Page 43: 90 80 Wing Cross Sectional Area (ft
Page 47 and 48: Table 6.II - RFP Dimensions Compare
Page 49 and 50: 38 Figure 6.1 - VAATE Goals
Page 51 and 52: TSFC 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.
Page 53 and 54: Deflection Angle Analysis for Mach
Page 55 and 56: Figure 6.8 - Cost Association with
Page 57 and 58: The inlet has a boundary layer dive
Page 59 and 60: 7 Materials and Structure The overa
Page 61 and 62: Vertical Attachment Points Horizont
Page 63 and 64: 8 Landing Gear Landing Gear design
Page 65 and 66: steel. This means that more braking
Page 67 and 68: Table 9.II - Final Component Weight
Page 69 and 70: throughout the 5-hour mission. Usin
Page 71 and 72: 10 Stability and Control To initial
Page 73 and 74: difference in neutral point and cen
Page 75 and 76: 40 30 20 10 0 -10 -20 -30 -40 -50 2
Page 77 and 78: The Vendetta configuration utilizes
Page 79 and 80: -0.6 -0.4 UNSTABLE NEUTRAL -0.2 Lif
Page 81 and 82: Validation of an aircraft design su
Page 83 and 84: consumption. The main aspects of th
Page 85 and 86: In addition to the performance requ
Page 87 and 88: 70,000 Altitude (ft) 60,000 50,000
Page 89 and 90: 11.4 Mission Requirements By comple
Page 91 and 92: Table 11.VIII - Landing Flight Prof
Page 93 and 94: 11.7 Alternate Missions In addition
Page 95 and 96:
12 Payload Weapon internal layout d
Page 97 and 98:
13 Cockpit Cockpit Design began wit
Page 99 and 100:
that could be used in landing and t
Page 101 and 102:
14 Systems The systems of the Vende
Page 103 and 104:
14.3 Fuel System Initial fuel syste
Page 105 and 106:
15 Manufacturing Several manufactur
Page 107 and 108:
16 Cost Analysis The final and perh
Page 109 and 110:
Appendix Threats Chart Common Surfa
Page 111 and 112:
Wing Break Point Fuel Aft Fuselage
Page 113 and 114:
The Vendetta Design Team Chris Atki
Page 115 and 116:
References 1. “Ejection Systems,
Page 117:
35. www.dfrc.nasa.gov/PAO/PAIS/HTML
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SAWE Report - Cal Poly San Luis Obispo

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