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2006-2007 MAE 461/462
Machine Design Project
Michael ColemanWill Goodrum
Marc HeiselMark HopkeArthur OrtonJohan Yavari
Luke Scruby
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OUTLINE Introduction
Controls
Lift & Skirt
Thrust
Chassis
Conclusion
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INTRODUCTION: HISTORY 2005/2006
hovercraft selected
Built, some issues
Truncated timetable
Flew, some issues 2006/2007
hovercraft continued
Concept only Major revisions
QuickTime and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime and aTIFF (Uncompressed) decompressor
are needed to see this picture.
IMAGE: http://www.hovpod.com/images/images.html
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PROJECT
ORGANIZATION
ChassisChassis ControlsControls LiftLift ThrustThrust
Luke ScrubyLuke Scruby
Josh HeimJosh Heim
Marc HeiselMarc Heisel
Johan YavariJohan Yavari
Alex SohnAlex Sohn
Mike ColemanMike Coleman
Will GoodrumWill Goodrum
Mike JonesMike Jones
James ClarkeJames Clarke
Nate GradyNate Grady
Brady BoltonBrady Bolton
Eric ZettervallEric Zettervall
Ryan OGradyRyan OGrady
Mark HopkeMark Hopke
Drew MichelottiDrew Michelotti
Matt FedericiMatt Federici
Dave AdelmanDave Adelman
Jon KassoffJon Kassoff
Arthur OrtonArthur Orton
Evan Van NessEvan Van Ness
Trevor WesolowskiTrevor Wesolowski
CFO: Johan
Yavari
CFO: Johan
Yavari
COO: Jonathan
Kassoff
COO: Jonathan
Kassoff
CTO: TrevorWesolowski
CTO: TrevorWesolowski
CIO: MikeColeman
CIO: MikeColeman
CEO: Will
Goodrum
CEO: Will
Goodrum
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CONTROLS: CONCEPT & ANALYSIS
Allow for complete fly-by-wire
Provide safety features topilot and bystanders
Interface with all othergroups components
Redundancies in event of
component failure Provide an easy to use
console
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CONTROLS: CONCEPT & ANALYSIS
Use modeling to
determine forces,torques, and velocity
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CONTROLS: DESIGN & TESTING
Select pre-designed
components, whenpossible
Design components
according to model
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CONTROLS: DESIGN & TESTING
Testing includes
verification of metrics ofperformance andspecifications
Primarily bench testing ofsystem
Functionality testing afterinstalled
Electrical system tests forfuses and kill switches
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LIFT & SKIRT: CONCEPT &
ANALYSIS
Anything flat plate will hover
Skirt provides functionality
Three primary types of skirts
Bag
Bag and Finger Skirt
Jupes
Selected a bag skirt design Considered terrain
Crafts purpose
Image Source: http://www.australianhovercraft.com/design_skirts.htm
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LIFT & SKIRT: CONCEPT &
ANALYSIS
Fan generates 4.5 in water pressure rise
Required craft profile confirmed
Chamfered corners
Bottom edge chamfered
Lift Fan and engine placement
Finalized total craft weight
(750lbs)
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LIFT & SKIRT: DESIGN &
CONSTRUCTION
Skirt
18 oz vinyl coated nylon
Sewing outsourced
Installed by wrapping around inch tubing
Lift fan
Engine placement
Support structure
Fan duct
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LIFT & SKIRT: LIFT FAN ASSEMBLY
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LIFT & SKIRT: DESIGN &
CONSTRUCTION
Orifices
Paper and Pencil vs. Cosmos Flow Works
Lift fan opening = 10% of lift fan shroud
Twenty 3.5 inch
diameter orifices
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LIFT & SKIRT:
Fuel system integrated design
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THRUST: CONCEPT & ANALYSIS
42 diameter, 36 pitchpropeller
10 HP engine
Belt drive Square steel tubing
and plywood frame
Fiberglass rudders
Final 2005-2006 Design
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THRUST: CONCEPT & ANALYSISPROPULSION
Must meet hill climb spec, maximum speed spec
Propeller vs. ducted fan
0
5
10
15
20
25
30
35
40
5 10 15 20 25 30 35 40 45 50
Velocity (mph)
ShaftPower(HP
)
800 mm
900 mm
1000 mm
Propeller Analysis
Propeller Selector
software
Propeller theory andequations
Ducted Fan Analysis Fan theory and curves
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THRUST: CONCEPT & ANALYSIS
STEERING:
Must meet turning ratespecification
Rudders vs. vectored thrust
Flat plate vs. airfoil rudders
Analysis:
FloWorks CFD
Varied rudder height, length,
airfoil shape Observed lateral force produced,
resulting angular acceleration
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THRUST: DESIGN &
CONSTRUCTION
Propulsion
Ducted fan selected
Rudder Flat plate selected
36 inches tall (diameter of duct)
24 inches long
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THRUST: CONCEPT & ANALYSIS
Modular design
Contains thrustmechanism
Contains steering controlsurfaces
Interfaces with
Chassis mounts
Controls for manipulationof control surfaces
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THRUST: DESIGN &
CONSTRUCTION
Final Design
26 HP Rotax 277
36 fan
Glass duct Flat plate rudders
Steel frame
Wooden ribs
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CHASSIS: CONCEPT & ANALYSIS
Square Steel Tubing with plywood deck
407 lbs
5.5 x 12.5
Final 2005-2006 Design
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CHASSIS: CONCEPT & ANALYSIS
Fall 2006 Proposed Design
Geometric Constraints
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CHASSIS: CONCEPT & ANALYSIS
plywood bulkheads
5.2mm plywood deck
1x3 pine stringers
17 oz 45-45-chop fiber
Polyester resin
Wax surface coat
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CHASSIS: CONCEPT & ANALYSIS
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CONCLUSION
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QUESTIONS?