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Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects 11.4 Propulsion Sub-Assembly All electronic components for the propulsion system are COTS. 11.4.1 Motor Mount Assembly The motor and gear box assembly are secured to the motor pylon. The motor pylon is then attached to the main wing by means of the motor block mounts already in the wing. It is attached with four ¼ in nylon screws. The top piece of the motor block mount is then replaced back into the wing. The speed controller is wired to the motor using bullet connectors and is connected to the battery extensions and the receiver extension wire as the whole motor assembly is being attached to the wing. Figure 101 shows the installed motor mount assembly. Figure 101: Motor Mount Assembly 11.4.2 Battery Assembly The battery pack consists of up to 24 Elite 1500 cells. These cells are soldered together in a “V” configuration in order to fit into the very nose of the wing. The battery pack is housed in a box made of 3/16” balsa. The battery pack is connected to the battery extension wire by a Deans connector. A hatch in the top of the wing allows the battery pack to be removed to be recharged. The battery assembly can be seen in Figure 102. 120
Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects 11.5 Release Mechanism Sub- Assembly Figure 102: Battery Assembly 11.5.1 Wing Store Release Mechanism The main components of this system are the release servo, the Tru-Fire triggers, the metal plates, the pull pins, and the rails. This assembly is shown below in Figure 103. The wing store release mechanism is installed into the wing tip after it is sheeted but before the wing tip spar is glued into place. This allows for proper alignment of the two components into the wing tip. The mechanism locations are described in Section 8 with the key points being that their placement was measured to keep the centerline of the inboard wing store 24 1/4” from the centerline of the aircraft and each store 6 1/8 “ apart to meet competition based design requirements. The rear pylon location is reinforced and measured to be ½” from the rear of the wing to avoid the rocket fins from interfering with the ailerons. The mechanisms are surrounded by tape during construction to prevent glue from the balsa skin from with and seizing the mechanisms and servo. 121
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University of Colorado Design/Build
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