PFR - Aerospace Engineering Sciences Senior Design Projects ...

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Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects Figure 142: Predicted (Black) and Actual (Blue) Schedule 14.3.1 Buff-2A Construction and Testing Schedule The aerodynamic model, the Buff-2A, was constructed and test flown on time. Due to the time required to make numerous nose gear repairs, the duration of the Buff-2A’s flight testing was carried out longer than originally anticipated. The tests that the team wished to complete with the Buff-2A therefore extended past its predicted time and the work spent on repairs caused delays for other aspects of the project. 14.3.2 Buff-2B Construction and Testing Schedule The initial construction of the Buff-2B was delayed for two reasons. First, the numerous repairs to the Buff-2A drew attention away from early construction on the Buff-2B. Second, the foam cores, which initially were to be ordered before the Winter Break, were instead ordered after. Waiting for these materials to arrive delayed the start of construction. The construction duration also took longer than anticipated. It was originally assumed that lessons learned from the aerodynamic model would allow the construction of the Buff-2B to be faster. Instead, construction techniques needed to be learned in order to construct the elements not included in the Buff-2A. This led to a much longer construction time than originally expected and thus delayed the flight schedule. 14.3.3 Buff-2C Construction and Testing Schedule The construction of the Buff-2C was delayed due to the delay of the Buff-2B. The construction duration of the Buff-2C was similar to the predicted duration. This unfortunately left little test flight time for the Buff-2C before competition. 14.4 Project Budget Analysis The overall project budget was estimated from past projects as well as quotes provided by suppliers. The budget was divided into two equally important components of aircraft construction and travel as both are needed for the project. 156
Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects The funding available for the project was provided by the Aerospace Engineering Sciences Department at the University of Colorado, the Engineering Excellence Fund, and Lockheed Martin Corporation. Each internally funded project receives $4,000 funding from AES. Since this funding was inadequate for the entire project, additional funding was sought from EEF and Lockheed Martin. The team applied for and received funding from EEF on the order of $2,000. Lockheed Martin, a longtime supporter of CUDBF and RECUV, also supported the project by providing a generous donation of $10,000. Funding under these sponsors brought the CUDBF budget to a maximum of $16,000. Aircraft construction was composed of four major categories: wing, propulsion, avionics, and missions. A breakdown of the entire project budget can be observed in Figure 143 on page 158 and Table 26 on page 159. The total estimated cost of the project was $15,162 including a 25% margin added to all spending. This placed the project under the $16,000 limit by $838. The actual cost of the budget was $13,955. 13.4.1 Wing Budget The major components for the wing construction were the foam wing cores and the balsa sheeting. Based on previous contact with FlyingFoam.com, the estimated cost for custom cut foam cores is approximately $1,500 for 12 sets of wings. Balsa sheeting will be purchased from Specialized Balsa and is quoted to cost $957. The reinforcements and other structural components will cost approximately $450 while adhesives cost an estimated $300. The total cost to build all the wings is approximately $3,291. Due to an overestimation of the foam core costs from FlyingFoam.com, the total cost of the wing construction was cheaper than expected. The actual cost of the wing construction was $3,107. 13.4.2 Propulsion Budget Propulsion components were comprised of the battery cells, motors, gearboxes, and ESCs. Competition battery cells were been ordered from CheapBatteryPacks.com with a discount value of 25% for a total of $180. An additional LiPo battery was ordered to allow for longer test flights for $200. Neu Motors agreed to a 50% discount on all parts, bringing the motor and gearbox costs to $375 and $300, respectively. A 30% discount was received from Castle Creations, allowing the purchase of ESCs to cost $686. With the addition of propellers and wiring, the total propulsion team cost was estimated to be $1,841. The actual costs of propulsion were much higher than anticipated. Backup motors, batteries, propellers, and speed controllers were ordered to replace broken items during testing. Additional shipping costs also inflated the expenditures. The total budget for propulsion was $3,128. 13.4.3 Avionics Budget The avionics system was comprised of the transmitter, receiver and servos. The team needed to purchase a DX6i transmitter and BR7000 receiver from Spektrum for $320. Servos and connectors were purchased from ServoCity.com for about $680. The total budget for avionics was estimated to be $1,000. The actual costs of avionics was $1,551. This was due to ordering a 157
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PFR - Aerospace Engineering Sciences Senior Design Projects ...

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