Vendetta Final Proposal Part 1 (3.4 MB) - Cal Poly

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was determined that each wing would have to withstand 660,000 lb. Though each individual spar was not sized, it wasdetermined that if the main wing spars were 3 in thick (simple beam cross-section) the wing would be able to withstandthe 7-g maneuver.It is also important to note that the landing gear attach to a bulkhead just forward of the aft closure to the weaponsbay. This locates the airborne and ground laden load paths on top of each other, allowing for some redundancy in thestructure and resulting in a lighter aircraft. Another redundant feature is the aft wing main load path. This bulkhead actsas the main forward engine attachment point. Again, this allows for a minimum of large structural bulkheads and thuscreates a lighter aircraft. The wing attachment points are shown in Figure 7.2.The empennage structure follows the same methodology as the wing attachment structure. The vertical tailsattach to the aft primary carry through of the wing. The aft vertical attach point is the same as the primary load path forthe horizontal tails. The horizontal tail is an area of concern for the Vendetta. The horizontal surfaces are capable ofproducing tremendous forces on the aircraft. At full deflection, the horizontal stabilizers could produce a 10,000 poundforce which would be transmitted through the pivot. It was determined that a 4 inch diameter pivot would be capable oftaking the shear and bending stress produced by this force however the structural rigidity be compromised. The root ofthe horizontal was widened to allow for a 10 inch diameter pivot shaft and increased structural rigidity. The loads takenby the pivot must be transmitted to the keel of the aircraft. There is a ring carry through structure that distributes the loadfrom the pivot point to the central keel. Two secondary bulkheads back up this main bulkhead. The empennagestructure is shown in Figure 7.3.ForwardSecondaryBulkheadsMain GearAttachmentForwardPrimaryBulkheadAft SecondaryBulkheadsAft PrimaryBulkhead &Main EngineAttachmentFigure 7.2 - Wing Attachment Detail37
Vertical AttachmentPointsHorizontal Pivot10” Diameter ShaftHorizontal StructuralLoad PathsFigure 7.3 - Empennage Structural LayoutThe structure of Vendetta was created to adhere to RFP load requirements. A V-n Diagram shown in Figure 7.4 wascreated using the required maximum and minimum g’ limits, and knowing the maximum dynamic pressure the aircraftshould withstand. This diagram shows the load envelope the aircraft can operate in. The diagram also shows thestandard gust lines for 1-g flight. The materials selection for Vendetta was a challenge. Vendetta takes advantage of thebenefits of modern composites while relying on the proven durability of more conventional materials. The materialsselection for different components is shown in Foldout 4.8Max g Limit6Max q4Max LiftGust Lines60 ft/secg's200 ft/sec-2-4-60 ft/secMin g Limit0 500 300 1000 600 1500 900 20001200Equivlent Knots Equivalent Velocity Airspeed(ft/sec)Figure 7.4 - V-n Diagram for Vendetta38
Page 6 and 7: Figure 11.1 - 1-g Military Specific
Page 8 and 9: Nomenclature6DOF Six Degrees of Fre
Page 10: 1 IntroductionThe American Institut
Page 13 and 14: Table 1.III - Comparison of the F-1
Page 15 and 16: The weight fraction method provides
Page 17 and 18: 3 ConfigurationThe current configur
Page 19 and 20: • Span = 53 ft• m.a.c. = 32 ft
Page 21 and 22: VendettaChris DroneyNate SchnaibleK
Page 23 and 24: low signature axisymmetric advanced
Page 25 and 26: 0° Lookup77°50403020100-10-20-30-
Page 27 and 28: 5.2 Wing SweepThe next wing paramet
Page 29 and 30: 5.3 Wing ThicknessThe effect of win
Page 31 and 32: 0.10.050-0.05-0.1-0.150 0.1 0.2 0.3
Page 33 and 34: 5.6 DragDrag was divided into four
Page 35 and 36: 6 PropulsionIn developing the propu
Page 37 and 38: Turbine Engine Technology (IHPTET)
Page 39 and 40: 35,00030,000Sea Level 1.5K 5K10K20K
Page 41 and 42: 0.990.980.97Pressure Recovery0.960.
Page 43 and 44: oundary layer diverter for high spe
Page 45: 7 Structural Layout & Material Sele
Page 49: 8 Landing GearLanding Gear design f

Vendetta Final Proposal Part 1 (3.4 MB) - Cal Poly

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