Propulsion PDR #1 AAE451 – Team 3 October 7, 2003

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Presentation transcript:

Propulsion PDR #1 AAE451 – Team 3 October 7, 2003 Brian Chesko Brian Hronchek Ted Light Doug Mousseau Brent Robbins Emil Tchilian

Method for Propulsion Selection Use constraint diagram and engine database to pick engine With given engine, find RPM range Use gold.m in a loop to make plots Pick pitch and diameter from gold.m results Select available prop

Constraint Diagram

Engine Database

Ref. www.towerhobbies.com Engine Comparison O.S. Max 1.40 RX-FI $999.99 w/o muffler 3.5 BHP 1,800-10,000 RPM 1.78 lbs O.S. Max 1.60 FX $269.99 w/muffler 3.7 BHP 1,800-10,000 RPM 2.04 lbs Ref. www.towerhobbies.com

Ref. www.towerhobbies.com O/S Max 1.60 FX Chosen for cheaper price and increased power with very small weight penalty gold.m run at ~65% throttle (7,000 RPM) Data sheet gives ~.44 gallons or ~2.6 lbs of fuel for a 30 minute flight Ref. www.towerhobbies.com

HP vs J at 7000 RPM Note: Diameter and Pitch vary Required Horsepower J (1/rev)

Efficiency vs J at RPM of 7000 Note: Diameter and Pitch vary hp J (1/rev)

Cp vs J at Pitch of 9 inches Note: Diameter and RPM vary CP J (1/rev)

Ct vs J at Pitch of 9 inches Note: Diameter and RPM vary CT J (1/rev)

Efficiency vs J at Pitch of 9 inches Note: Diameter and RPM vary hp J (1/rev)

Chosen Propeller Based on carpet plots from gold.m: RPM used = 7000 Pitch is ~9 inches Diameter is 20 inches Efficiency ~0.48 Ct~ 0.057 Cp~0.029

Chosen Propeller Based on gold.m: Tip speed check: Thrust = 14lbs (per gold.m) Tip speed check: Tip Speed = Tip Speed = 610 ft/sec

Closest Available Propeller Zinger 20x8 Wood Pusher Propeller 20 inches in diameter with 8 inch pitch Closest to 20x9 available $25.99 from Tower Hobbies Ref. www.towerhobbies.com

Summary of Results O.S. Max 1.60 FX engine chosen: 3.7 bhp Uses ~2.6lbs of fuel for 30 minute flight Zinger 20x8 Wood Pusher Propeller: 20 inches in diameter with 8 inch pitch Efficiency ~0.48 at 7,000 RPM

Questions?

Ref. http://www.allstar.fiu.edu/aero/BA-Background.htm Reasonability Check Bootstrap approach taken by Dr. Lowry parametric performance method Ref. http://www.allstar.fiu.edu/aero/BA-Background.htm