PFR - Aerospace Engineering Sciences Senior Design Projects ...

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Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects 2.0 System Architecture Author: Eric Hall Co-Author: Dan Colwell 2.1 Overview of Systems The CUDBF aircraft will be a high performance aircraft capable of completing all competition missions in an optimized manner. In order to close the design envelope, the overall system and subsystems will approach each design with an iterative process attempting to design a system with higher efficiency. The competition requires two payloads to be flown in three separate flights. Each payload must be capable of being remotely released from the aircraft from the pilot’s transmitter. The first two mission flights require a 4 liter water bottle to be flown in configurations where the bottle is either flown empty or filled with water. The specific bottle is McMaster-Carr part 4322T6 and weighs 0.75 pounds empty. Filled with water, the total payload weight is 9.05 pounds. The bottle dimensions are 5.875 inches diameter and 11.25 inches length. The bottle can be observed below in Figure 1 [2] . Figure 1: Centerline Store Payload (Bottle) The payloads required for the third flight mission are four wing-mounted rockets. The specific rockets are Estes Patriot Rockets #2056. Each rocket is 21 inches in length and must be ballasted to 1.5 pounds. Two rockets must be on each wing half with the inboard rocket 24 inches from aircraft centerline and outboard rocket 30 inches from centerline. An Estes Patriot Rocket can be observed in Figure 2 [3] . 18
Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects Figure 2: Wing Mounted Store (Rocket) Before the aircraft can be flown at competition, officials from DBF will conduct a complete technical inspection of the aircraft to ensure the aircraft meets the design requirements and is safe to fly. The aircraft, transmitter, and all payloads will be loaded into the team’s boxes. The boxes will be measured to ensure that the maximum dimensions of the box are 2’x2’x4’ and then weighed. This weight becomes the rated aircraft cost (RAC) as seen in Equation 1. = + + + Equation 1: Rated Aircraft Cost The battery packs of the propulsion system will be weighed to ensure that no pack weighs more than 4 pounds and then will be visually inspected to verify that either NiMH or NiCad battery cells are being used. The propulsion electronic lines will be inspected to verify a 40-amp rated fuse is installed between the battery packs and the motors. The aircraft will then be loaded with the heaviest payload (full bottle) and will be lifted by the wingtips to ensure structural stability. The transmitter and receiver system will be activated on the aircraft to properly show adequate control of the aircraft’s control surfaces. Then the transmitter will be deactivated to show proper fail-safe procedure of the aircraft. The required fail-safe protocol is zero throttle, up elevator, right rudder, and right aileron. 2.2 Competition Missions Concept of Operations The concept of operations consists of a ground assembly mission and three flight missions. The ground assembly mission must be completed before any flight missions can be attempted. During flight missions, the aircraft must adhere to the flight plan shown in Figure 3. The aircraft will take off from the starting line in under 100 feet, fly 500 feet downwind and make a 180 degree turn. The upwind leg of the flight must be at least 1,000 feet and have a 360 degree loop before turning downwind back towards the starting line. 19
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