Hovercraft Presentation 2

8/8/2019 Hovercraft Presentation 2

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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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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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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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Fall 2006 Proposed Design

Geometric Constraints


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plywood bulkheads

5.2mm plywood deck

1x3 pine stringers

17 oz 45-45-chop fiber

Polyester resin

Wax surface coat


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CONCLUSION


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QUESTIONS?

Documents

Hovercraft Presentation 2