PFR - Aerospace Engineering Sciences Senior Design Projects ...

Project Final Report – CUDBF April 30 th , 2009
ASEN 4028: Aerospace Senior Projects
Foam inserts mounted around the spaces reserved for the aircraft components further ensure no
damage came to the aircraft or its elements during the drop test. Together, the entire balsa and
foam structure was projected to weigh 3.1lb. Once the structure and materials were finalized,
COSMOSWorks [20] was used to determine whether or not the structure could feasibly pass the
6in drop test without significant damage to the box, or damage to any aircraft components stored
inside. Figure 52 shows the results of the computer design which showed that the box would
indeed survive the drop. In case, during testing, the box did fail due to imperfect manufacturing
(especially on the corners), wedges made from a composite material added to the box sides
would further increase the strength without significantly adding to overall container weight.
Figure 52: Box Drop Test Analysis Using COSMOSWorks
8.3 Propulsion Mechanical Design Elements
8.3.1 Motor Selection
The Neu 1100 series motors are custom built electric brushless motors capable of handling
between 50 and 1500W of power. They are designed to spin as fast as 60,000 rpm. The motor
needed to be able to handle 400W of continuous power, with 800W short bursts for takeoff. The
motor also needed to have a low enough rpm/V such that the motor will not exceed 60,000rpm
with 21.6 V. Table 15 shows the motor model options considered.
Table 15: Motor Selection
Neu Motor RPM / V Continuous
Watts
Maximum
Watts
Weight (g)
1107 2.5Y 2750 300 600 90
1110 1.5Y 3350 400 800 114
1110 2Y 2500 500 1000 114
1112 1.5Y 2900 600 1200 138
80