Lighter Than Air Critical Design Review Mark Cote Yonas Tesfaye Josh Levinger Bryan Owens The A-Team

Presentation Objectives Introduce Final Design Scale drawings of final design Control systems of final design Aerodynamic analysis of final design Final design evolution and analysis

Final Design Linear –Pros: Reliable and well tested Low drag profile StabilitySimplicityExpandable –Cons Difficult to maneuver Large structure requirement Unwieldy (N-body problem)

Scale Drawings Front View Courtesy: Mark Cote

Scale Drawings Side View Courtesy: Mark Cote

Scale Drawings Bottom View Courtesy: Mark Cote

Control Systems We will be using two servos to steer. The motors are in line and the front motor will be used to steer left and right. The rear motor will be used to control pitch. We will also have rear stabilizers.

Circuit Diagram Courtesy: Josh Levinger

Materials ObjectQuantity Mass (g) Large Motor Propellers Receivers Servos Battery pack Balloons Structure Total Weight : ~ 1040 g Total Payload: ~ 710 g

Aerodynamic Analysis =1.773 m 3 1 balloon =.524 m 3 3 balloons overfilled should support the weight. We believe that we will average 2/3 of the maximum thrust throughout the course for a velocity of 2.09 m/s. Lift generated by three normal balloons: N Overfilling Balloons: N We believe our blimp will be able to complete the course in 42 seconds.

Final Design Evolution and Analysis Originally, we had decided on a triangle design with differential steering. Our first concern was in regards to drag because it had profile drag of about two balloons as which meant we would be fighting twice as much drag. Front View Top View Courtesy: Mark Cote

Analysis Cont’d We also realized that with differential steering, we would lose a significant amount of thrust.

Good Luck to all the Teams!!!