The barn owls
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The Barn Owls. Chris “Mo” Baughman Kate Brennan Christine Izuo Dan Masse Joe “Sal” Salerno Paul Slaboch Michelle Smith. Design Drivers. High Rate of climb Max. cruise speed. Motivation. To build an aircraft which will take off (multiple times without crashing)

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The barn owls

The Barn Owls

Chris “Mo” Baughman

Kate Brennan

Christine Izuo

Dan Masse

Joe “Sal” Salerno

Paul Slaboch

Michelle Smith


Design drivers
Design Drivers

  • High Rate of climb

  • Max. cruise speed


Motivation
Motivation

  • To build an aircraft which will take off (multiple times without crashing)

  • Accurately predict the performance of the designed aircraft

  • Maximize the speed and rate of climb


Guidelines and limitations
Guidelines and Limitations

  • 400 – 800 sq. in. planform area

  • Given Astro-Cobalt 615G motor

  • Must be statically stable

  • Takeoff run < 300 ft.

  • No rockets!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?


Schedule and deadlines
Schedule and Deadlines

  • February 5th – Present Conceptual Design

  • February 26th – Present Detailed Design

  • March 4th – Complete Parts List

  • April 6th-9th – Ground Tests






Design factors in choosing airfoil
Design Factors in Choosing Airfoil

  • Appropriate Reynolds Number Data (low speed)

  • Minimize Drag

    • t/c ~ 14%

    • wide drag bucket

    • Shallow increase in drag outside of drag bucket

  • Maximize Lift

    • High CL max


Wing

  • Design Decisions

  • No sweep

    • Maximize lift

    • Ease of manufacture

  • Taper ratio of 0.25

    • Minimize drag

    • Create large enough root chord length in order to provide clearance for payload

  • Slight dihedral for roll stability

  • Winglets enhance in-flight performance


Fuselage
Fuselage

  • Airfoil-shaped fuselage serves as lifting surface

  • Also serves as a wing box which carries electronics

  • Conventional fuselage has been replaced by booms on order to minimize weight and drag


Horizontal tail
Horizontal Tail

  • NACA 0009 Airfoil

    • Low drag, symmetric

    • Can Produce both Lift and Reverse Lift

    • Swept to maintain straight trailing edge to maximize control surface while minimizing planform area


Take off landing estimations
Take-off/Landing Estimations

Take-off Distance = 176 ft.

Landing Distance = 370 ft.

(does not take into consideration climbing over an obstacle)


Flaps
Flaps

  • Slotted, 15% of total wing area

  • Used as flaperons

    • Enhanced lift for take-off

    • Control during flight

    • Speed brakes during landing



Static stability
Static Stability

Static Margin: 0.029753 (stable)

CM,α= -0.78423 (stable)

CN,β = 0.015653 (stable)

CLβ = -0.015653 (stable)



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