PFR - Aerospace Engineering Sciences Senior Design Projects ...

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Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects With this analysis complete, 14AWG wire was chosen because it proved to be the lowest weight option. The 32 amp continuous rating will ensure that the wire will not overheat, and short 40 amp bursts will be handled by the wire. 9.1.5 Fuse Competition rules state that the propulsion system must contain a 40 amp fuse placed such that no portion of the propulsion system sees more than 40 amps of continuous current. A Cooper- Bussmann [29] ATC style 40 amp blade fuse was chosen to meet this requirement. The fuse is rated for 40 amps of continuous current, with up to 80 amps in short bursts less than 10 seconds. The fuse will be placed just behind the battery pack right before the power splits to both motors. This will allow the fuse to be easily accessible from the top of the wing for easy arming and disarming. An image of the fuse is shown in Figure 80. Figure 80: 40 Amp Fuse 9.2 Avionics Electrical Design Elements 9.2.1 Avionics Electrical Overview The overall responsibility of the avionics subsystem is to implement the communication system between the pilot and the plane and to use a telemetry system to record the necessary flight characteristics. The communication system will consist of a transmitter and receiver that will be able to control the servos that are connected to the control surfaces, electronic speed controllers, microcontroller and the releasable payloads. Figure 81 illustrates that six channels will be required for the transmitter and receiver. Four channels will be utilized to control the aircraft, one will be needed for the payload release system, and the last channel will be used to control the propulsion system. 104
Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects Figure 81: Overall Avionics Diagram In order to verify that the plane meets certain project requirements, it is necessary to have an onboard telemetry system capable of measuring several flight characteristics. The team will be using a commercially manufactured onboard telemetry system produced by Eagle Tree Systems that was purchased by the previous CUDBF team. The Eagle Tree telemetry system includes a small, less than 1.5 oz, flight data recorder that will be placed on the plane. Post flight, the data stored on the data recorder will be able to download to a computer via the USB port. The Eagle Tree telemetry system is also capable of producing real-time data; however, at this time the CUDBF team feels it is unnecessary to utilize this feature. 9.2.2 Payload Release Microcontroller With limited experience designing a developmental board that would allow a microcontroller to be programmed, a commercial off the shelf USB development board was purchased, as seen in Figure 82. Figure 82: USB Development Board 105
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PFR - Aerospace Engineering Sciences Senior Design Projects ...

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