Team 5Vehicle Propulsion QDR 2

Presented By: Maria MullinsJames Roesch

AAE 451 – Team 5February 22,

2005 2

Aircraft Characteristics

Weight – 0.84 lbs Flight Speed – 30 ft/s

AAE 451 – Team 5February 22,

2005 3

Aircraft Operating Conditions

0 5 10 15 20 25 30 35 400

0.5

1

1.5

2

2.5

3

3.5

4

Velocity (ft/sec)

Pow

er r

equi

red

(ft-

lbf/

sec)

Aircraft Power required versus trim speed

Minimum power of 2.2402 ft-lbf/sec is achieved at a speed of 23.1595 ft/sec.

Operating power of 2.5134 ft-lbf/sec is required at an operating speed of 30 ft/sec

AAE 451 – Team 5February 22,

2005 4

Method

Prop ’02 code Integrated gold.mPitch / Diameter iterations

Motor DatabaseMotors selected from MotoCalc

No Brushless Heavy Weight Eliminated

AAE 451 – Team 5February 22,

2005 5

Propeller Selection

Propeller Diameter 9 in

Pitch 6 in

Operating RPM 3512 RPM

Material Carbon Fiber

Efficiency 0.76

Cost $4.39

AAE 451 – Team 5February 22,

2005 6

Propeller stuff

J = 0.69 CP = 0.031

CT = 0.034 η = 0.76

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.05

0.1

Thr

ust

Coe

f, C

T

Data for hypothetical propeller with tau= 0.66667

CT*= 0.034124 for J*= 0.68571

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.02

0.04

0.06

Pow

er C

oef,

CP

CP*= 0.030899 for J*= 0.68571

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.2

0.4

0.6

0.8

Eff

icie

ncy,

eta

Advace ratio, J=V/(nD)

Eta*= 0.75728 for J*= 0.68571

X is the selected operating point

AAE 451 – Team 5February 22,

2005 7

Motor Selection - Graupner Speed 280 6VCharacteristics

Propeller Shaft Diameter

0.079 in

Engine Diameter 0.95 in

Engine Length 1.25 in

Weight 1.44 oz

Cost $10.90

AAE 451 – Team 5February 22,

2005 8

Motor Performance

Input Voltage 7.12 Volts

Input Current 1.08 Amp

Output Power 4.96 Watts

Free RPM 14397 RPM

Motor Efficiency 0.65

AAE 451 – Team 5February 22,

2005 9

Motor Operating Conditions

0 5 10 15 20 25 30-5

0

5

mot

or e

ffic

ienc

y* is the selected operating point

Graupner Speed 280 PT 6V #6328 with 7.1229 volts input

0 5 10 15 20 25 30-5

0

5x 10

4

RP

M

0 5 10 15 20 25 30-1000

0

1000

Pow

er O

ut(w

atts

)

0 5 10 15 20 25 300

10

20

motor current (amperes)

Tor

que

out(

in-o

z)

AAE 451 – Team 5February 22,

2005 10

Gear Box Selection – Great Planes Electrifly Gearbox

Weight 0.53 oz

Gear Ratio 4.1:1

Length 1.5 in

Height 1.4 in

Outer Diameter 1.2 in

Shaft Length 0.3 in

Shaft Diameter 0.12 in

Cost $11.99

AAE 451 – Team 5February 22,

2005 11

Speed Controller Selection

JETI 30 Amp Microprocessor Motor Controller For NiCd 6 to 12 cell

batteries $44.90 Weight = 1 oz.

Fiñ