PFR - Aerospace Engineering Sciences Senior Design Projects ...

Project Final Report – CUDBF April 30 th , 2009
ASEN 4028: Aerospace Senior Projects
Table 16: Propeller Options
Propeller
Diameter (in)
Propeller
Pitch
Maximum
Thrust (lb)
12 6 5.37
12 12 4.30
13 6.5 5.06
13 10 4.78
14 7 5.87
14 12 4.65
The only propellers that met the minimum thrust requirement were the 12in x 6 and the 14in x 7
propellers. The 14in x 7 propellers, shown in Figure 54, was chosen because it provides the
maximum amount of static thrust. With a designed maximum power draw of 1200W, dual
motors utilizing 14in x 7 propellers can produce up to 8.81 lbs of static thrust, enough to make
the 100ft takeoff distance.
Figure 54: 14 x 7 APC-E Propeller
8.4 Structures Mechanical Design Elements
8.4.1 Wing Bending Model
Analysis for the deflections and stresses acting on the wing due to lifting loads was performed
using hand calculations and confirmed by COSMOSWorks simulations. The distributed force
acting on the beam was estimated using the Treffitz plot and strip forces representing a 3.5g load
determined from AVL. Many of the structures analysis was checked with Dr. Maute, a team
advisor [22] . The near parabolic shape was inserted into MATLAB and a 2 nd order polynomial
function was best fit to the lift distribution. This function can be seen in Equation 19.
() = −0.001 + 0.0215 + 0.807
Equation 19: Lift Distribution Estimation
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