Propulsion PDR I DR 2 Preliminary Design Review

Propulsion PDR I DR 2 Preliminary Design Review II October 17, 2000 Presented By: Mark Blanton Team DR 2 Chris Curtis Loren Garrison Chris Peters Jeff Rodrian

Propulsion PDR I • Propulsion PDR II Presentation Content – – – Aircraft Parameters Propeller Selection Motor/Gearbox Selection Speed Controller Selection Motor Power Source Motor/Component Price List DR 2

DR 2 Propulsion PDR I • Aircraft Characteristics – Values Required for Motocalc aircraft evaluation – Aerodynamics & Weight • Wing Span • Wing Area • Empty Weight 92. 52 inches 2141. 20 square inches 98. 52 ounces • Flight Speeds • Takeoff Speed • Cruise Speed 23 25 ft/s

Propulsion PDR I DR 2 • Propeller Selection – Propeller clearance of the fuselage • Propeller Minimum Diameter is 14 inches, hence propeller diameter – Gold. m Analysis vs. Motocalc Analysis • Gold. m input includes the flight speed, and motor parameters • Gold. m output includes propeller thrust and propeller power based on input • Motorcalc input includes aircraft parameters, propeller size, motor, gearbox size, speed controller, and power source • Endurance time can be evaluated from Motocalc as well as verification of the power used by the motor and propeller

Propulsion PDR I DR 2 • Propeller Selection – Propeller Pitch Selection • Master Airscrew Propellers in Inventory • Propeller Pitches available 6, 8, and 10 inch from Tower Hobbies – Propeller Flight Requirements • Thrust and Endurance Time – Maximum Thrust Required at Takeoff – Thrust Required during Cruise – Required Cruise Endurance Time @ 17 ft/s 2. 7607 lb 0. 7624 lb 00: 12: 00 minutes

Propulsion PDR I DR 2 • Propeller Selection – Propeller Pitch Evaluation • Pitch = 6 inch – Maximum Thrust at takeoff – Underpowered for takeoff conditions 2. 4889 pounds • Pitch = 8 inch – – Maximum Thrust at takeoff 3. 2618 pounds Thrust during Cruise 1. 7937 pounds Endurance Time @ 17 ft/s 00: 14: 57 Thrust requirement and time requirement met

Propulsion PDR I DR 2 • Propeller Selection – Propeller Pitch Evaluation • Pitch = 10 inch – – Maximum Thrust at takeoff 4. 0128 pounds Thrust during Cruise 1. 545 pounds Endurance Time @ 25 ft/s 00: 17: 44 Thrust requirement and time requirement met • Propeller Selected – Propeller Size of 14 x 10 inch selected because of the thrust advantage and higher endurance time

DR 2 Propulsion PDR I • Propeller Thrust Conditions During Takeoff – Takeoff Conditions • • • Flight Speed RPM of Propeller Max. Thrust Required Thrust Coefficient Integrated Thrust Value 23 5831 2. 7607 0. 0964 4. 0128 ft/s RPM pounds – Takeoff Conditions exceeded • Thrust available is 145% greater than maximum required thrust for liftoff • Throttle Setting 100%

DR 2 Propulsion PDR I • Propeller Thrust Conditions During Cruise – Cruise Conditions • • • Flight Speed RPM of Propeller Thrust Required Thrust Coefficient Integrated Thrust Value 25 3899 0. 7624 0. 0830 1. 5450 ft/s RPM pounds – Cruise Conditions exceeded • Thrust available is 200% of minimum required thrust for cruise • Throttle Setting 65%

Propulsion PDR I Takeoff CT Plot on the Left Cruise CT Plot on the Right DR 2 T = 4. 0128 pounds T = 1. 5450 pounds

DR 2 Propulsion PDR I • Propeller Power Conditions during Takeoff – Takeoff Conditions • • • Flight Speed RPM of Propeller Motor Power Available Power Coefficient Propeller Power Required 23 5831 0. 6705 0. 0458 0. 3927 ft/s RPM hp hp – Takeoff Conditions Exceeded • Excess Power Total is 171% of Propeller Required Power • Throttle Setting at 100%

DR 2 Propulsion PDR I • Propeller Power Conditions during Cruise – Takeoff Conditions • • • Flight Speed RPM of Propeller Motor Power Available Power Coefficient Propeller Power Required 25 3899 0. 6705 0. 0458 0. 1174 – Takeoff Conditions Exceeded • Excess Power is 571% of Propeller Required Power • Higher Efficiency at lower RPM • Throttle Setting 65% ft/s RPM hp hp

Propulsion PDR I Takeoff CP Plot on the Left Cruise CP Plot on the Right DR 2 P = 0. 3927 hp P = 0. 1174 hp

DR 2 Propulsion PDR I • Propeller/Motor Gearbox Selection – Based on Engine Selection – Standard Gearbox • Gearbox Characteristics – Gear Ratio 2. 38: 1 – Manufacturer attaches the gearbox – Weight incorporated with the motor weight Astro 25 G Astro 035 -15

Propulsion PDR I DR 2 • Motor Selection – Selection based on current inventory, historical data point, and Motocalc electric motor evaluations – Comparison Drawn between Astro 25 G, 40 G, and 60 G • Gear Ratio fixed at 2. 38: 1 • Motocalc Filter set at 30 Amps – To be sure that the amperage is not too high – Verifies the combination of all components – Astro 40 G • Didn’t meet filter restrictions, passed endurance time with 00: 13: 23 at 25 ft/s – Astro 60 G • Passed endurance time with 00: 13: 28 at 25 ft/s – Astro 25 G • Passed endurance time with 00: 17: 44 at 25 ft/s

DR 2 Propulsion PDR I • Motor Characteristics – Manufacturer – Motor • • • Horsepower Weight Motor Efficiency Motor Constant Rated Cell Number Astroflight 25 G 0. 6705 12. 5 0. 78 971 10 – 16 hp ounces 0. 005 50 1. 1 Ohm Amps ounces RPM/Volt cells • Aircraft Speed Controller – Astro 204 D Characteristics • Resistance • Maximum Current • Weight

Propulsion PDR I DR 2 • Aircraft Power Source – Sanyo 1700 SCR • Number of Cells • Capacity • Weight 14 1. 700 1. 89 A–hr ounces each – Endurance Requirement • • Required Endurance Time Throttle Setting Estimated Endurance Time @ 100% Charge Estimated Endurance Time @ 70% Charge 12 minutes 75% 17 minutes 44 seconds 12 minutes 24 seconds

DR 2 Propulsion PDR I • Motor Component Price List – Tower Hobbies Price List(Magazine and Online) – Tower Hobbies – – Astroflight 25 G Master Air. Screw 14 x 10 inch propeller Astro 035 -15 2. 38: 1 Gearbox Astro 204 D Speed Controller • In Inventory – Sanyo 1700 SCR $ 180. 00 $ 5. 29 $ 0 $ 109. 00 (In Inventory) $ 69. 86 (14 count) – Total Cost $ 75. 15 (If batteries not available) (attached to motor) (In Inventory)

Propulsion PDR I Questions? DR 2