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Propulsion QDR

AAE 451Fall 2006Team 4

Tung Tran Mark KochMatt Drodofsky Matt Lossmann

Ravi Patel Ki-bom KimHaris Md Ishak Andrew Martin

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Overview

• Selection Process (propeller and motor)

• Geometric Propeller properties

• Motor Selection

• Power Supplies

• Cost Breakdown

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Selection Process

1. Run Main_System_Design.m @ 130ft/s to find propeller diameter

2. Run gold.m for various P/D’s and maximize efficiency

3. Using the equation J=V/(nD), the RPM’s of the motor can be found

4. Blade pitch is calculated5. Cp is known and the power requirement can

be calculated 6. Find a motor that can satisfy the power

requirement

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Propeller GeometriesChose a P/D of 0.8.

•This is the highest value found in commercially built propellers

•This yields an advance ratio of 0.9

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Propeller Geometries

• τ = .8• V = 130 ft/s• J = .9• N = 173.33 rps• Β = 57.85º

inchesD 10

R

nDVJ

1tan

Where: Tau = P/D

R = propeller radius

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Propeller Geometries

• From Raymer’s:

• Helical Tip speed for wooden prop not to exceed 850ft/s

22 VtipVhelicaltipV

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Motor Selection

pin CDnP 53We now know all the variables except Pin. Solving the equation above yields:

wattsPin 159.486

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Motor Selection

• Rimfire 35-48-1000 outrunner brushless motor– Continuous Amps – 50A

– Input Voltage – 11.1 – 14.8V

– Weight – 6 oz

– Kv – 1000 RPM/V

– Price - $69.99

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Battery Selection

• Team Orion Avionics SLPB 1250mAh 7.4V 2S-1P

– 2 batteries – 4 cell total

– 14.8 volt total

– Max discharge 72 amps

– 2500 mAh total

– Weight – 5.8 oz

– Price - $75.98 total

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Speed Controller

• Castle Creations Phoenix-80 Brushless Motor Control – 80A continuous power

– BEC of 3A

– Price - $135.99

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Horsepower Calc)(*)()( amperesIvoltsVwattsP

hpP

wattshpwattsHp

wattsP

AVwattsP

99.

7.745/1*

740

50*8.14)(

rpmRPM

VVRPMRPM

voltsVVRPMvKRPM

14800

8.14*/1000

)(*)/(

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Max Flight Time

min5.160

min1*90

9050

4500

45001

3600*

1000

1250

ss

sA

As

Ash

smAh

min3min5.1*2 total

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Cost Estimation

• Motor - $69.99• Speed Controller - $135.99• Batteries – $75.98• Propeller - $5

• Total with Speed Controller – $286.96• Total without Speed Controller – $150.97

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Questions?