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Completed Design Review

Team Airblade

Timothy Davenport

Brian Guerrero

Mark KastantinOscar Kataura

William Peters

Robert Taylor

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Overview

Structural Changes since PDR

Description of Finalized Design

Design analysis: Stability and control

Calculations: mass, payload, course

completion time, etc.

Timeline

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Structural Changes since PDR

Trapezoidal cross-section >> triangular cross-

section

Sides of craft: balsa boards >> triangular truss

Pitch propeller moved further forward

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Side View

78.74 inches

3.94 in

3.75 in3.19 in

Large motors with servos

Small motor

Stabilizer

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Top View

78.74 inches3.75 in payload payloadbattery / control

note: balloons removed from view

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Front View

72

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Structural Specifics

Propulsion: 1 large propeller at front end, 1large propeller at back end

Pitch: 1 small motor at front endTriangular truss for slanted sides, ladder

design for top side

2 meters long, 8.5 meters wide.

Balloons attached at front end, midpoint andback end.

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Materials

Balsa wood (3/8 inch

squares)

2 large motors 2 large propellers

1 small motor

1 small propeller

2 servos

1 battery pack

1 radio control

module 3 balloons with

attachments (string)

wire

1. Balloons and string are not included in mass calculations

2. Wire is included in the mass of the other equipment

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Mass Calculation

Material Unit Mass (g)* Units Total (g)

balsa wood 0.369 g/in 611.22 in 225.5

large motor 249.9 2 499.8

large propeller 7.9 2 15.8

small motor 96.3 1 96.3

small propeller 4.9 1 4.9

servo 38.3 2 76.6

battery pack 110.2 1 110.2

radio control module 50.4 1 50.4*unless otherwise specified Vehicle Mass (g) 1079.5

Payload (g) 670.5

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Pitch Stability

Lift distributed evenly

Small motor provides pitch needed to maintain

flight

Variable

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Propulsion

Two large motors running at 9.6V provides2(0.79) = 1.58 N

Drag = 1.58 N (at steady state)

Drag

Motor thrust

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Dragand Velocity

This means the blimp should be moving at a

fast walking speed.

Drag coefficient for a sphereCdrag ! 0.5

vmax !2D

VSCdrag

! 2(1.58)1.2T(0.52 )(0.5)

! 2.59ms

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Turning

The large motors work in tandem

Torque = (2)(39in)(0.0254 m/in)(0.79 N) =

1.57 N/m

payload payloadbattery / control

Center of mass

78.74 inches

3.75 in payload payloadbattery / control

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Battery Life

One battery pack providing

of lifetime

Time of completion of race track

Ample lifetime for completion

Xbattery !

30amps mi

.5amps

! 20mi

tcourse

max

!

87.8m

2.2m /s

! 39.9s

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Timeline

Up to this point we have the truss structure

complete and have attached the servos

For the rest of the time

Monday Tuesday Wednesday Thursday Friday Saturday Sunday

Week 1 Attach motors to structure

Week 2 Complete Wiring Attach Balloons Test Fly and

Week 3 Optimize Trials

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Conclusion

So far the project has proceeded smoothly

Anticipate weight problems that will be

fixed by sanding the structure

We feel we have a strong structure with

great turning potential

Ready to finish building and get flying