The design report

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Conceptual Design 3 Synthesis of concept 3.1 Configuration design 3.1.1 The group discussed and shortlisted a few possible design ideas for the EPUAV High performance and manoeuvrability Seaplane Flying wing Conventional Biplane Twin fuselage At the time of the beginning of the project, Virgin galactic was in the news and the idea of making a near replica of the global flyer brought the group to a consensus. Figure 3.1.101 The initial idea was to create a near replica of the global flyer as shown in figure 3.1.101. The basic idea was not changed throughout the project however due to an enormous array of limitations; the final product wasn’t a resemblance of the global flyer. The twin fuselage, large aspect ratio wing idea with a pod in the middle was what later became the iSpy.
Initial Sizing 3.1.2 Estimating aircraft weight at the start of a project is purely based on historical data. The maximum weight allowed was 2.8kg. However, since the iSpy was to be a twin fuselage design, rough estimates of additional components were added. Given allowed weight 2.8kg (single engine, single fuselage design) iSpy Additional battery 400g Additional motor 250g Second fuselage 150g Takeoff weight was therefore, estimated to be 3.6 kg. The first step in terms of sizing was to calculate wing size. Fuselage size was to be determined later as fuselage size is inversely proportional to the empennage size. CAD visualisation of the aircraft would give a better idea about the size of the empennage and hence the fuselage and a reasonable visually pleasing size would be chosen. As the aircraft had to have a large aspect ratio, maximum allowed wingspan of 2.3m was to be used. The chord length was determined from wing loading from historical data. Typical wing loading suggested in various resources is 4.6 kg/m 2 but this would’ve resulted in a chord length of 34cm. The group realised that this does not fit in with the idea of a slender thin wing. After discussions with the professor, a wing loading of 7-8 kg/m 2 was chosen which resulted in a chord length of around 22cm and an aspect ratio of over 10.
Page 1 and 2: EP-UAV Project 2009 iSpy Kate Rietd
Page 3 and 4: Preliminary and Detailed Design 4 S
Page 5 and 6: Executive Summary 1 iSpy is a twin
Page 7: Design Requirements and Objectives
Page 11 and 12: Airfoil design 3.1.4 Wing: Before t
Page 13 and 14: Tail: A symmetric airfoil with a th
Page 15: Empennage design 3.1.6 The dimensio
Page 19 and 20: Pod Layout 3.1.9 The pod of the air
Page 21: Weight estimation and Centre of Gra
Page 26 and 27: Figure 3.2.303 - Stability axis der
Page 30 and 31: CAD definition of the concept 3.2.5
Page 32 and 33: Figure 3.2.505: The vertical tail F
Page 34 and 35: Preliminary and Detailed Design 4 S
Page 36 and 37: Figure 4.1.109 Figure 4.1.110 The c
Page 38 and 39: Material type was chosen for each c
Page 40 and 41: The nose section of the fuselage co
Page 42 and 43: This part of the fuselage is the mo
Page 44 and 45: Empennage structure 4.1.3 Prelimina
Page 46 and 47: An ‘L’ shaped support was also
Page 48 and 49: Landing gear 4.1.5 Initial stages o
Page 50 and 51: Pod Structure 4.1.7 Figure 4.1.701-
Page 52 and 53: Fuselage fabrication 5.2 Since ther
Page 54 and 55: The servo holder plates in front of
Page 56 and 57: Landing gear fabrication 5.5 The de
Page 58 and 59:
Fabrication of Pod 5.6 Like the fus
Page 60 and 61:
Control surface fabrication 5.9 Ail
Page 62 and 63:
Note: The weights taken after fabri
Page 64 and 65:
It was here that the first problem
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Flight Test 6.2 The flight test aim
Page 68 and 69:
Appendix 7 Appendix A - AVL files i
Page 70 and 71:
TRANSLATE -0.450 0.384 0.00 # BFIL
Page 72 and 73:
CLARK YM-15 - Re = 250000 Alfa Cl C
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Appendix C - Preparation of materia
Page 76 and 77:
Appendix D - Control surface sizing
Page 82 and 83:
Conceptual Design Preliminary Desig
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The design report

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