Zephyr: A High Altitude Long Endurance Unmanned Air Vehicle ...

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V = 90cmThe UAV is on a trestle that is just under a metre in height. This is the startingposition and the height from which the users will lift from.D = 90cmThe average height of a man in the UK is 175.2cm according to the Health Survey forEngland 2007 [7]. As men are launching the UAV from a height of 90cm to justabove head height, the vertical distance travelled is 90cm.T = 0°The UAV is facing in the direction of travel so the user does not need to twist to liftthe object.F = 1 a dayThe UAV will only be lifted once a day and carried for no more than a minute,however by looking at the lifting tables a lift lasting up to one hour will not alter theresult.G = GoodThe hands wrap around the aircraft comfortably as there are small launch handlesbuilt especially for this purpose.C = 23kgC is the load constant within the equation and it is always equal to 23kg.34
Using the given values, the corresponding multipliers can be read from the NIOSHlifting tables. Table 2 shows a summary of the variables and their multipliers.Variable Actual Value Multiplier ValueH 35cm hm1 1.00V 90cm vm2 0.96D 90cm dm3 0.87T 0° tm4 1.00F 1 a day fm5 1.00G Good gm6 1.00C 23kg C 23kgTable 2. Summary table of variables and their multipliersBy substituting the values into the NIOSH equation, the maximum weight that can belifted per person can easily be calculated:L = hm1 . vm2 . dm3 . tm4 . fm5 . gm6 . cL = 1.00 . 0.96 . 0.87 . 1.00 . 1.00 . 1.00 . 23L = 19.2 kgThe NIOSH lifting equation shows that in order to maintain user safety and long termperformance, no person should be asked to carry more than 19.2kg. This means that atleast two people are needed to lift <strong>Zephyr</strong> currently as it weighs around 30kg.As <strong>Zephyr</strong> is span loaded, two people are needed at either end of the wings in order to35
Page 1 and 2: Zephyr:A High Altitude Long Enduran
Page 3 and 4: AcknowledgementsI’d like to thank
Page 5 and 6: ContentsChapter 1 - Introduction an
Page 7 and 8: Chapter 1Introduction and Backgroun
Page 9 and 10: 1.1 History of ZephyrZephyr is a li
Page 11 and 12: The Zephyr 5 project continued with
Page 13 and 14: airframe, with the main aim to impr
Page 15 and 16: 1.2 Environmental IssuesDuring the
Page 17 and 18: order to function, they may not thu
Page 19 and 20: 1.2.3 Cosmic RaysCosmic rays are en
Page 21 and 22: wind speeds. This is to ensure that
Page 23 and 24: crystalline silicon cells and can b
Page 25 and 26: which are then insulated. In order
Page 27 and 28: motion of the aircraft including ro
Page 29 and 30: Within the portable cabins the crew
Page 31 and 32: Simple payloads instructions withou
Page 33 and 34: In the event that the wing does not
Page 35 and 36: Graph 4 shows radiosonde density da
Page 37 and 38: 3.2 NIOSH Lifting EquationThe hand
Page 39: Variable Description MultiplierD (c
Page 43 and 44: 3.3 Airspeed SensorThe current airs
Page 45: 12VSensorPCBZenerDiodeFigure 8. Dia
Page 48 and 49: 3.4 PayloadThe payload is the carry
Page 50 and 51: where λ is the wavelength, c is th
Page 52 and 53: 3.5 Angle of Attack SensorThe angle
Page 54 and 55: The magnetic sensor seemed much mor
Page 56 and 57: Chapter 4Angle of Attack Experiment
Page 58 and 59: The sensor was powered using an ext
Page 60 and 61: It has to be noted however, that on
Page 62 and 63: experience the atmospheric conditio
Page 65 and 66: 5.2.1 Aerial PhotographyThe most co
Page 67 and 68: meaning that these cameras can be u
Page 69 and 70: Infoterra have a project called Far
Page 71 and 72: it out for long endurance missions.
Page 73 and 74: Figure 18. QinetiQ’s Zephyr5.4 Co
Page 75 and 76: where it is needed rather than havi
Page 77 and 78: Appendix 3Schematic diagram of the
Page 79 and 80: Appendix 5The results table for the
Page 81 and 82: BibliographyQinetiQ Documents[1] St
Page 83: [19] Encyclopedia Britannica, 2004.

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