Yesterday, the group met in the SAS Lab to test the thrust capacity of the motors. Since each motor has a limit as to how much weight it can lift, it is imperative that we measure each motors thrust capacity so that the quadcopter is light enough to be lifted by four motors. The setup for this experiment consisted of a cup taped to a triple beam balance. The motor was placed on top of the cup and wired in reverse so that instead of pulling, it pushed. We then set the motor to spin at 25, 50, 75, and 100 percent power and measured the resulting change in weight. This was repeated with a charged and uncharged battery, as well as with an eight and ten inch propeller blade. The data we collected is below.
| Blue
Propellers |
|
|
| Total Mass=98.2 g |
|
|
| |
|
|
| Percentage of power |
Uncharged Battery |
Charged Battery |
| 25% |
100 |
99.5 |
| 50% |
131.5 |
139 |
| 75% |
160 |
163 |
| 100% |
192.3 |
204 |
| Orange
Propellers |
|
|
| Total Mass=96.8 |
|
|
| |
|
|
| Percentage of power |
Uncharged Battery |
Charged Battery |
| 25% |
101.3 |
102 |
| 50% |
145.5 |
150 |
| 75% |
191.7 |
199.5 |
| 100% |
268.5 |
285.5 |
Subtracting the initial weight from the measured weight gives the amount of weight lifted by the motor. With the data, the group decided to use the orange propellers because they provide more thrust, up to a maximum of 188g of lift per motor. Using this number, the maximum weight of the quadcopter cannot exceed a mass of about 725g.
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