2006-2007 MAE 461/462Machine Design Project

Michael ColemanWill GoodrumMarc HeiselMark HopkeArthur OrtonJohan YavariLuke Scruby

OUTLINE

IntroductionControlsLift & SkirtThrustChassisConclusion

INTRODUCTION: HISTORY

2005/2006 →hovercraft selected

Built, some issuesTruncated timetableFlew, some issues

2006/2007 →hovercraft continued

Concept onlyMajor revisions

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IMAGE: http://www.hovpod.com/images/images.html

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 O’GradyRyan O’Grady

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: Trevor Wesolowski

CTO: Trevor Wesolowski

CIO: Mike Coleman

CIO: Mike Coleman

CEO: Will GoodrumCEO: Will Goodrum

CONTROLS: CONCEPT & ANALYSIS

Allow for complete fly-by-wireProvide safety features to pilot and bystandersInterface with all other groups’ componentsRedundancies in event of component failureProvide an easy to use console

CONTROLS: CONCEPT & ANALYSIS

Use modeling to determine forces, torques, and velocity

CONTROLS: DESIGN & TESTING

Select pre-designed components, when possible

Design components according to model

CONTROLS: DESIGN & TESTING

Testing includes verification of metrics of performance and specificationsPrimarily bench testing of systemFunctionality testing after installedElectrical system tests for fuses and kill switches

LIFT & SKIRT: CONCEPT & ANALYSIS

Anything flat plate will hoverSkirt provides functionality

Three primary types of skirtsBagBag and Finger SkirtJupes

Selected a bag skirt designConsidered terrain Craft’s purpose

Image Source: http://www.australianhovercraft.com/design_skirts.htm

LIFT & SKIRT: CONCEPT & ANALYSIS

Fan generates 4.5 in water pressure riseRequired craft profile confirmed

Chamfered cornersBottom edge chamfered Lift Fan and engine placement

Finalized total craft weight (750lbs)

LIFT & SKIRT: DESIGN & CONSTRUCTION

Skirt18 oz vinyl coated nylonSewing outsourcedInstalled by wrapping around ½ inch tubing

Lift fanEngine placementSupport structureFan duct

LIFT & SKIRT: LIFT FAN ASSEMBLY

LIFT & SKIRT: DESIGN & CONSTRUCTION

OrificesPaper and Pencil vs. Cosmos Flow WorksLift fan opening = 10% of lift fan shroudTwenty 3.5 inch

diameter orifices

LIFT & SKIRT:

Fuel system – integrated design

THRUST: CONCEPT & ANALYSIS

42” diameter, 36” pitch propeller 10 HP engineBelt driveSquare steel tubing and plywood frameFiberglass rudders

Final 2005-2006 Design

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)

Shaf

t Pow

er (H

P)

800 mm900 mm1000 mm

Propeller AnalysisPropeller Selector softwarePropeller theory and equations

Ducted Fan AnalysisFan theory and curves

THRUST: CONCEPT & ANALYSIS

STEERING:Must meet turning rate specificationRudders vs. vectored thrustFlat plate vs. airfoil rudders

Analysis:FloWorks CFDVaried rudder height, length, airfoil shapeObserved lateral force produced, resulting angular acceleration

THRUST: DESIGN & CONSTRUCTION

PropulsionDucted fan selected

RudderFlat plate selected36 inches tall (diameter of duct)24 inches long

THRUST: CONCEPT & ANALYSIS

Modular designContains thrust mechanismContains steering control surfaces

Interfaces withChassis mountsControls for manipulation of control surfaces

THRUST: DESIGN & CONSTRUCTION

Final Design26 HP Rotax 27736” fanGlass ductFlat plate ruddersSteel frameWooden ribs

CHASSIS: CONCEPT & ANALYSIS

•Square Steel Tubing with ½” plywood deck

•407 lbs

•5.5’ x 12.5’

Final 2005-2006 Design

CHASSIS: CONCEPT & ANALYSIS

Fall 2006 Proposed Design

Geometric Constraints

CHASSIS: CONCEPT & ANALYSIS

•¼” plywood bulkheads

•5.2mm plywood deck

•1”x3” pine stringers

•17 oz 45-45-chop fiber

•Polyester resin

•Wax surface coat

CHASSIS: CONCEPT & ANALYSIS

CONCLUSION

QUESTIONS?