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Propulsion QDR #2 AAE451 – Team 3 November 20, 2003

Propulsion QDR #2 AAE451 – Team 3 November 20, 2003. Brian Chesko Brian Hronchek Ted Light Doug Mousseau Brent Robbins Emil Tchilian. Aircraft Walk Around. Wing Span ~ 14.6 ft A/C Length = 10 ft. Conventional Tail – NACA 0012. Pusher. Internal Pod. Tricycle Gear. Low wing – Clark Y.

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Propulsion QDR #2 AAE451 – Team 3 November 20, 2003

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  1. Propulsion QDR #2 AAE451 – Team 3 November 20, 2003 Brian Chesko Brian Hronchek Ted Light Doug Mousseau Brent Robbins Emil Tchilian

  2. Aircraft Walk Around • Wing Span ~ 14.6 ft • A/C Length = 10 ft • Conventional Tail – NACA 0012 • Pusher Internal Pod • Tricycle Gear • Low wing – Clark Y

  3. Introduction • Compare 2 blade propeller to 4 blade propeller with updated code. • Do analysis of weight difference between using 2 and 4 blade propeller • Pick propeller

  4. Blade Comparison 3.7 hp Diameter 20 7 6 18 Pitch 5 18 Diameter 9 8 16 Pitch 7 • Integrated 4-blade Kappa Code • Updated Blade Geometry 2-Bladed Propellers Cruise Condition 4-Bladed Propellers

  5. Blade Comparison

  6. Deflection at Tip of Engine Mount Thrust (lbf) δtip(in)=(Thrust)(S.F.)(L3)/(3EI) Ref. Gere pg. 892 L (in) Assumptions: Small Deflections Safety Factor = 1.5 Rectangular Spruce Beam Current Known Values: Thrustmax = 25 lbf L4-blade = 8 in L2-blade = 9 in h = 1 in t = varying to get desired deflection Where Thrust = (lbf) L = Length (in) E = Young’s Modulus (psi) I = Moment of Inertia (in4) Moment of inertia of rectangular beam: I (in4) = (t)(h3)/12

  7. Deflection at Tip versus Weight 2 blade • Assuming 1% Deflection: • 2 blade beam weight ~ 0.1 lbf • 4 blade beam weight ~ 0.07 lbf • Propeller Weight (estimated from density and volumes): • 2 blade ~ 0.1 lbf • 4 blade ~ 0.2 lbf 4 blade weight penalty ~ .07 lbf 4 blade

  8. Chosen Propeller 4-blades • Zinger 16X7 Wood Pusher Propeller • 16 inches in diameter with 7 inch pitch • 4 blades Ref. www.zingerpropeller.com

  9. Questions?

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