Critical Design Review

1
Critical Design Review
Team Floating Point
MIT 16.00
April 25, 2003

2
Team Members

• Caroline Reilly
• David Lafferty
• Elsa Castillo
• Synthia Tonn
• Tudor Masek

3
Objectives

• To demonstrate the final design for the Lighter
  Than Air vehicle.
• And to demonstrate the expected performance of
  the final design in order to ensure that it is
  optimal and ready to be built.

4
Previously Approved Design
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Final Design
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Final Design Concept

• Beam as main body
• 2 balloons
• 1motor
• 1rudder
• 2 servos (1 for the rudder and 1 for the motor)
• Horizontal Stabilizer

7
Control Systems

• The rudder is the main control surface for our
  design. It gives us the ability to turn, and it
  also acts as a stabilizer.
• Use of the motor for vector thrust (acts as an
  elevator).
• Use of a horizontal stabilizer in order to
  maintain steady flight.

8
Vehicle Mass Estimates
Component Mass (in grams)Battery 160Speed
controller 8 Receiver 27Servo (Elevator)
43Motor 230Propeller 10 Servo (Rudder)
43Rudder 48Body 87 Subtotal 656
Payload 500      Total 1056
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Aerodynamic Analysis

• Assuming mass is 1.056 kilograms (full payload)
• Thrust needs to equal 1.4 N for steady level
  flight
• Drag is equal to .43 N with 10 increase for body
  drag .473 N
• Estimated cruising speed 1.9 m/s

10
Final Design Evolution

• The changes made to the design were to make the
  structure lighter and faster
• The second motor was removed from the design
  because the advantage it would provide in speed
  is not worth the additional weight.
• We decided that for our purpose a beam of balsa
  wood was just as effective and more convenient
  than a truss structure.
• We also concluded that 2 balloons would provide
  sufficient lift for our vehicle.

11
Gnatt Chart
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Picture of our LTA (so far)
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Questions???