Critical Design Review AAE490 Project 1 March 2003
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Transcript of Critical Design Review AAE490 Project 1 March 2003
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Critical Design Review
AAE490
Project
1 March 2003Nicholas BakerBrian ChernishAndrew FaustDoug HoldenMara PrentkowskiNicholas Setar
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AAE 490
Overview
• Design Requirements • Last Semester’s
Design• Walk around• Landing Gear• Fuselage• Wing
• Horizontal Tail• Vertical Tail • Avionics Pod• Engine• Radio Instillation • Color Scheme
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Design Requirements & Objectives• Maximum weight < 55 lbs
• Cruise speed > 50 ft/sec
• Stall speed < 30 ft/sec
• Climb angle > 5.5°
• Operating ceiling > 1000 ft
• Flight time > 30 minutes
• Payload of 20 lbs in 14”x6”x20” pod
• Carry pitot-static boom
• Spending limit < $300
• T.O. distance < 106 ft (~60% of McAllister Park runway length)
• Rough field capabilities
• Detachable wing
• Easy construction
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Aircraft Walk Around
•Low wing – Clark Y•Tricycle Gear
•T-Tail – NACA 0012
•Pusher
•Wing Span = 14.4 ft
•Wing Chord = 2.9 ft
•A/C Length = 10 ft
•Internal Pod
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Walk Around
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Landing Gear
• Nose Gear– Mounting Hardware
• Main Gear– Mounting Hardware
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Nose Gear
• Fults Tooling Dual Strut (RF800)
• Mount: 1/4” plywood bulkhead
• Weight: 9 oz• Cost: $33.94• Servo Actuated for
steering
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Main Gear
• Carden Edge 540 40% CE54040
• Mount: 1/4” Plywood • Weight: 23 oz• Cost: $89.95
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AAE 490
Fuselage
• Size
• Materials/Construction
• Articles that Mount to Fuselage
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Fuselage
• Outer Fuselage– 1/8” Plywood Formers – 1/4” x 1/4” Balsa Stringers– 3/32” Balsa Sheeting 4-6 lbs/ft3 Contest grade
• Keel– 1/8” Plywood Formers– 1/2” x 1/2” Basswood Stringers– 1/4” x 1/4” Balsa Truss – 3/32” Balsa Sheeting 4-6 lbs/ft3 Contest grade
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Fuselage
• Things that attach to the keel– Nose Gear– Main Gear– Wing – Horizontal/Vertical Tail– Engine Nacelle – Nose Cone
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Fuselage
Nose Cone Attachment/Removal
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Wing
• Size
• Materials/Construction
• Wing Mounting
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Wing
• Size – The wing was sized to
the following constraint
Where;• W = 53 lbs• Vmin = 30 ft/sec• CL = 1.19• r= .002309 slug/ft3
S = 41.7 ft2
2min
2*
* * L
WS
V C
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Wing
• Materials – 1/8” Balsa Ribs– 1/8” Plywood Root Rib– 1/2” x 1/2” Spruce Spare
(2)• with 1/8 balsa shear web
– Leading and Trailing edge stock
– Aluminum Main Spar 2024 T3
– 3/32” Balsa Sheeting 4-6 lbs/ft3 contest grade
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Wing Mounting
• Wing is Plug in style– Main Spar stays in
plane– Wings Panels
removable for ease of transportation and maintenance
– 2 Anti-rotation bolts keep wing attached
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Wing
Aluminum Wing Spar• 2024 T3 Aluminum
Tube– 1.75” Diameter– .049” thickness– 46” Length – 5 degree dihedral
angle• To get proper location
of wing
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Horizontal Tail
• Size
• Materials/Construction
• Horizontal Tail Mounting
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Horizontal Tail
Size
• Assume cg is locate at the quarter chord
• Assume ηh = 0.9
• ARwing = 5
• Swing = 41.7 ft2
• ARh-tail = 3• Find: Sh and AR => bh and ch
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Horizontal Tail
• xc/4 = 0 ft ≈ xcg
• Static Margin = 15%
• SM = (xac – xcg)/c• Solve for xac
• xac = 0.435 ft
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Horizontal Tail
acac
wing
XX
c
1
1 1
h
WB h
WB
Aircraft
h
WB
L h hac h ac
L
ac
L h hh
L
C d SX X
C d SX
C d S
C d S
Roskam Eq. 3.18
0.49hd
d
13.896WB
LC rad
Raymer Fig 16.12
Roskam Figure 3.3
12.69h
LC rad
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Horizontal Tail
Results
• Sh = 8.5 ft2
• bh = 5.051 ft
• ch = 1.683 ft
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Horizontal Tail
Materials
• 1/8” Balsa Ribs• 1/8” Plywood Root
Rib• 3/4” x 3/8” Bass
Spar (2)• Machined Ribs, Trailing
Edge, and Leading Edge• 1/16” Sheeting on
Leading Edge and Center Section
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Rocker
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Vertical Tail
• Size
• Materials/Construction
• Vertical Tail Mounting
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Vertical Tail
• lV = 5.47 ft• Swing = 41.8 ft2
• bwing = 14.4 ft• VV = 0.031
V VV
wing wing
S lV
S b
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Vertical Tail
• TR = 1.5
• Sweep Angle = 22.25o
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Vertical Tail Construction
• 1/2” x 1/2” Bass Center Spar
• 1/2” x 1/4” Bass Front Spar
• 1/4” Balsa Vertical Webs
• 1/8” Balsa Ribs
• Balsa Leading Edge and Trailing Edge
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Avionics Pod
• Air Data Boom Attachment
• Pod Attachment
• Camera
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Avionics Pod
Air Data Boom Placement– On the Fuselage for Protection– In Front of the Plane for Accurate Data
Collection– Near the Pod for Easy Integration– Camera Placement
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Avionics Pod
Pod Construction– Pod Dimensions 14” X
11” X 20”– 1/8” Plywood Base– Balsa Sides
• Similar to Fuselage Construction
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Avionics Pod
Pod Attachment – Variable placement for CG
adjustment– Vibration isolated for clearer
pictures and electronics protection– Easily mounted with six bolts at the
top of the Pod
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Avionics Pod
Camera Placement– Mounted just above the Keel– 30° look down angle when level allowing for an in
flight banking look down angle of 45°
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Engine
• Engine
• Engine Mount
• Engine Mount Pylon
• Additional Hardware
• Propeller Selection
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Engine
DA-50-R– 5 Hp– 3.13 lbs– Length 6.7”– Bore 1.6771”– Stroke 1.3779”– Clockwise Rotation
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Engine
• Engine Mount– ¼” Plywood Firewall
3” X 4”– Standoff Mounts
Shown in Blue
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Engine
• Engine Mount Pylon– 1/2” square Bass
Wood stringers– Balsa Ribs– 4” X 3” plywood
mounting plate– 14” tall providing 12.5”
of prop clearance
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Engine
• 50 oz Dubro Fuel Tank
• Fuel Delivery– Fuel tank located at CG– Fuel line run through pylon to the engine– Vacuum created by engine stroke draws fuel
• Good for up to 30 feet
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Engine
• Additional Required Hardware– Throttle Servo– Ignition Battery– Ignition Switch
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Engine
• Propeller Choices– Manufacturers
• Bolly• Menz• Mejzlik
– Sizes• 24” X 8”• 22” X 10”• 23” X 10”
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Aircraft Maintainability
• Service Hatches– Top Hatch – Servo Access Hatches
• Exposed Engine for Ease of Maintenance
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Radio Instillation
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Color Scheme
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APPENDIX
• Parts Drawings
• Single Receiver Instillation
• Material List
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Single Receiver
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