Lab 5 – System Analysis 1

3 Blade Pusher
Voltage
Current
Thrust
Power
Thrust Calibration
RPM
Power Input
Power Output
Propulsion Efficiency
Advance Ratio
volts
amps
grams
%
grams
RPM
Watts
Horsepower
%
–
0.37 0.12 181.90 10 0.25 841.78 0.02 0.01 33% 2.81
0.74 0.19 180.90 15 -0.16 1501.00 0.07 0.00 -7% 1.57
1.11 0.28 183.70 20 0.99 2160.22 0.16 0.03 19% 1.09
1.48 0.37 189.00 25 3.16 2819.45 0.27 0.09 34% 0.84
1.85 0.46 195.40 30 5.80 3478.67 0.43 0.17 40% 0.68
2.22 0.57 198.60 35 7.11 4137.89 0.63 0.21 33% 0.57
2.59 0.67 204.50 40 9.54 4797.11 0.87 0.28 32% 0.49
2.96 0.78 211.30 45 12.33 5456.33 1.15 0.36 31% 0.43
3.33 0.90 220.00 50 15.91 6115.55 1.50 0.47 31% 0.39
3.70 1.00 223.20 55 17.22 6774.78 1.85 0.51 27% 0.35
Thrust at 0 (g): 181.3 Velocity (m/s): 3
Blade diam. (m): 0.0762

Table 1: data for three blade propellers.

1

Figure 1: thrust vs. power graph for three blade propellers.

2

Figure 2: propulsion efficiency vs. advance ratio for three blade propellers.

2 Blade Pusher
Voltage
Current
Thrust
Power
Thrust Calibration
RPM
Power Input
Power Output
Propulsion Efficiency
Advance Ratio
volts
amps
grams
%
grams
RPM
Watts
Horsepower
%
–
0.37 0.12 181.90 10 0.08 1052.23 0.02 0.00 11% 2.69
0.74 0.19 180.90 15 -0.33 1876.25 0.07 -0.01 -14% 1.51
1.11 0.28 183.70 20 0.82 2700.28 0.16 0.02 16% 1.05
1.48 0.37 187.90 25 2.55 3524.31 0.27 0.07 27% 0.80
1.85 0.46 191.90 30 4.19 4348.34 0.43 0.12 29% 0.65
2.22 0.57 196.30 35 6.00 5172.36 0.63 0.18 28% 0.55
2.59 0.67 201.60 40 8.18 5996.39 0.87 0.24 28% 0.47
2.96 0.78 207.10 45 10.44 6820.42 1.15 0.31 27% 0.42
3.33 0.90 213.20 50 12.95 7644.44 1.50 0.38 25% 0.37
3.70 1.00 219.30 55 15.45 8468.47 1.85 0.45 25% 0.33
Thrust at 0 (g): 181.7 Velocity (m/s): 3
Blade diam. (m): 0.0635

Table 2: data for two blade propellers.

3

Figure 3: thrust vs. power graph for two blade propellers.

4

Figure 4: propulsion efficiency v. advance ratio for two blade propellers.

Lab 5 Report