Critical Design Review

AAE490

Project

1 March 2003Nicholas BakerBrian ChernishAndrew FaustDoug HoldenMara PrentkowskiNicholas Setar

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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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AAE 490

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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AAE 490

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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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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AAE 490

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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AAE 490

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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AAE 490

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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