PROPULSION PDR 1 AAE 451 TEAM 4 Jared Hutter, Andrew Faust, Matt Bagg, Tony Bradford, Arun Padmanabhan, Gerald Lo, Kelvin Seah October 7, 2003
OVERVIEW Preliminary Engine Selection Propeller Analysis Conclusions Follow-Up Actions
PRELIMINARY ENGINE SELECTION From the Constraint Analysis, Power Loading, W/P = 22.42 lbf / SHP From Preliminary Weight Estimate, Gross Take-Off Weight, WTO = 54.52 lbf Total Required Power = 2.45 HP Twin Engine Considerations
PRELIMINARY ENGINE SELECTION Source: http://www.globalhobby.com/magnum/magxl.htm
PRELIMINARY ENGINE SELECTION Engine Choice: Magnum XL 75 Specifications: Bore: 26.8 mm Stroke: 22.0 mm Practical RPM: 2,000 - 12,000 Power: 2.30 BHP Weight 21.7 oz
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.
PROPELLER ANALYSIS Decreasing RPM
PROPELLER ANALYSIS Decreasing RPM
PROPELLER ANALYSIS
PROPELLER ANALYSIS CLOSE UP 8000 RPM
PROPELLER ANALYSIS ηp = 0.545
PROPELLER ANALYSIS CLOSE UP ηp = 0.545
PROPELLER ANALYSIS for Dia = 13” Design Point Decreasing Diameter
PARAMETERS PRELIMINARY Diameter: 13” Pitch: 7” RPM: 8,000 rev/min Power: 1.24 HP Advance Ratio: 0.3165 rev-1 Power Coefficient: 0.0358 Thrust Coefficient: 0.0616 Efficiency: 54.5% 13” x 7” $29
FOLLOW-UP ACTIONS Analysis for twin-engine operation. Analysis for engine-out condition.
QUESTIONS?