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16.00 CDR: Spring, 200416.00 CDR: Spring, 2004

The TeamThe TeamAlex Coso

Fred Gay

Dan Cunningham

Val Lugo

Final DesignFinal Design

Drawings courtesy of Dan Cunningham

Final DesignFinal Design

Drawings courtesy of Dan Cunningham

Final DesignFinal Design

Drawings courtesy of Dan Cunningham

Scale DrawingsScale Drawings

Drawings courtesy of Dan Cunningham

Scale DrawingsScale Drawings

Drawings courtesy of Dan Cunningham

Scale DrawingsScale Drawings

Drawings courtesy of Dan Cunningham

Structural AnalysisStructural Analysis Structure:Structure: 65g x 1 = 65g65g x 1 = 65g Motors:Motors: 93g x 2 = 186g93g x 2 = 186g Motors:Motors: 269g x 1 = 269g 269g x 1 = 269g Propellers:Propellers: 5.2g x 3 = 15.6g 5.2g x 3 = 15.6g Servos:Servos: 43g x 3 = 129g43g x 3 = 129g Radio Gear:Radio Gear: 46g x 1 = 46g46g x 1 = 46g Batteries:Batteries: 260g x 1 = 260g 260g x 1 = 260g Total Mass:Total Mass: approx. 970.6g approx. 970.6g Payload:Payload: approx. 729.4g approx. 729.4g

Dimensions:Dimensions:Length: 2m Width: 1.25m Height: 1.5mLength: 2m Width: 1.25m Height: 1.5m

Aerodynamic AnalysisAerodynamic Analysis

Helium Required:Helium Required:Lift=ΔρVg=17.15NLift=ΔρVg=17.15N

Assuming two balloons, their radius must Assuming two balloons, their radius must be .53m to generate the necessary liftbe .53m to generate the necessary lift

Thrust must be equal to drag in steady flightThrust must be equal to drag in steady flight

Thrust = Drag = 2.64NThrust = Drag = 2.64N

vv22=2D/ρSC=2D/ρSCD D v=1.5m/sv=1.5m/s

Total course time estimate: 60 to 70 sec.Total course time estimate: 60 to 70 sec.

Control AnalysisControl Analysis

Yaw control is provided by two Yaw control is provided by two oppositely facing, fore and aft oppositely facing, fore and aft mounted small motorsmounted small motors

Pitch control is provided by the third, Pitch control is provided by the third, main drive motor, which pivots about main drive motor, which pivots about a horizontal axisa horizontal axis

Control surfaces will be added if we Control surfaces will be added if we deem them necessary after initial deem them necessary after initial flight testingflight testing