1. PROPULSION PDR 1 AAE 451 TEAM 4
Jared Hutter, Andrew Faust, Matt Bagg, Tony Bradford,
Arun Padmanabhan, Gerald Lo, Kelvin Seah
October 7, 2003

2. OVERVIEW Preliminary Engine Selection Propeller Analysis Conclusions
Follow-Up Actions

3. PRELIMINARY ENGINE SELECTION
From the Constraint Analysis,
Power Loading, W/P = lbf / SHP
From Preliminary Weight Estimate,
Gross Take-Off Weight, WTO = lbf
Total Required Power = 2.45 HP
Twin Engine Considerations

4. PRELIMINARY ENGINE SELECTION
Source:

5. PRELIMINARY ENGINE SELECTION
Engine Choice: Magnum XL 75
Specifications:
Bore: 26.8 mm
Stroke: 22.0 mm
Practical RPM: 2, ,000
Power: 2.30 BHP
Weight 21.7 oz

6. PROPELLER ANALYSIS
Fixed pitch to be 7” based on recommendation for the selected engine.
Varied propeller diameter between 10” and 14”.
Varied RPM between 5,000 and 13,000 rev/min.
Plotted CP, CT, HP and ηp versus J.
Varied pitch and re-analyzed the data.
Design point selected.

7. PROPELLER ANALYSIS
Decreasing RPM

8. PROPELLER ANALYSIS
Decreasing RPM

9. PROPELLER ANALYSIS

10. PROPELLER ANALYSIS
CLOSE UP
8000 RPM

11. PROPELLER ANALYSIS
ηp = 0.545

12. PROPELLER ANALYSIS
CLOSE UP
ηp = 0.545

13. PROPELLER ANALYSIS
for Dia = 13”
Design Point
Decreasing Diameter

14. PARAMETERS PRELIMINARY Diameter: 13” Pitch: 7” RPM: 8,000 rev/min
Power: 1.24 HP
Advance Ratio: rev-1
Power Coefficient:
Thrust Coefficient:
Efficiency: 54.5%
13” x 7”
$29

15. FOLLOW-UP ACTIONS Analysis for twin-engine operation.
Analysis for engine-out condition.

16. QUESTIONS?