propulsion qdr
DESCRIPTION
Propulsion QDR. AAE 451 Fall 2006 Team 4 Tung TranMark Koch Matt Drodofsky Matt Lossmann Ravi PatelKi-bom Kim Haris Md IshakAndrew Martin. Overview. Selection Process (propeller and motor) Geometric Propeller properties Motor Selection Power Supplies Cost Breakdown. - PowerPoint PPT PresentationTRANSCRIPT
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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