v_poyNTLlVg/UJ7fgOux0tI/AAAAAAAAKpU/D8_9jtuRkFo/s1600/Volkswagen%2BAqua%2BHovercraft%2BConcept.jpg Milestone 9 Team 4thewin Section 0102

Table of Contents 1.Introduction a.Project Task b.Team Mission Statement 2.Gantt Chart 3.Preliminary Design 4.Final Design 5.Bill of Materials 6.Construction Details 7.Product Performance 8.Conclusion

Introduction Project Task: ● Autonomously navigate course ● Controlled by Arduino microcontroller ● Deliver payload to the correct bin Mission Statement: ● Unique hovercraft ● Clean, aesthetically-pleasing design ● Learn something new

Gantt Chart Key CompletedNeeds to be completed CriticalMilestone due

Preliminary Design Structure: ● Rectangular plenum (40cm x 60cm) ● Mass(deck): kilograms ● Soft skirt + double deck ● Material: Balsa and Foam ● “Water Tank” ballast Payload Delivery: ● “Firetruck ladder” ● 2 whisker touch sensors → cut levitation, switch to payload only with pedestal contact ● “Bucket” for payload ● Light sensors to sense correct bin

Preliminary Design Levitation(1): Axial JH3 (DC 12V) ● Mass: kg ● 92 x 92 x 38 mm ● Airflow: 237 m^3/hr Propulsion(2): Axial - Q622-ND (DC 5V) ● Mass(1): kg ● 60 x 60 x 25 mm ● Air Flow: 24.3 CFM (0.688m³/min) Electronics: ● Servos for payload delivery system (3) ● Light sensors w/shroud (3 in front) ● LEDs for ambient light underneath shroud ● Sensors for Payload Delivery System (1)

Preliminary Design Issues Structure, Skirt, and PDS: ●Materials for decks not suited for design ●Water Tank Ballast unneeded ●Original bucket idea impractical ●Vanes for Airflow unneeded ●Skirt location changed ●Payload Material changed Electronics: ●Reduced # of sensors ●Less servos on payload

Final Design: Structure ● 8 1”x1”x1” posts supporting top deck ● Hot glue to secure decks ● Original amount of holes did not provide enough pressure

Final Design: Fans ● Levitation Fan o Ebm-Pabst 4112NH3 Axial ● Propulsion Fans o Two Delta Electronics PFB0912UHE Axial ● Levitation Fan mounted at Center of pressure o Propulsion Fans mounted in line on each side of Levitation Fan

Final Design: Payload Delivery Toy ladder with bucket for payload storage: ● 2 servos o X-axis movement (forward/backward) o Z-axis movement (circular base) ● 1 Arduino Sidekick servo o opens the box on the ladder Movement: ● Ladder holds deliverable in place ● Shutoff timer ● Shut off levitation fan ● Ladder extends above pedestal ● Light sensors find correct bin due to reflectivity

Final Design: Power ● Levitation & Propulsion - 12V 4200 mAh battery ● Arduino, sensors, servos - 7.2V 3000 mAh battery ● Servo voltage regulation - 3 diodes in series ● Power control of fans - 3 MOSFETs

●Sensors ○5 Light-to-Frequency Converters ○1 Photoresistor ●Actuators ○2 Hi-tec Servos ○1 Arduino Sidekick Servo Final Design: Sensors and Actuators

Final Design: Control Algorithm Middle sensor reads darkYesNo Left fan& Right fan= HIGH BACK RIGHT = dark OR FRONT RIGHT = dark BACK LEFT = dark OR FRONT LEFT = dark FRONT LEFT & BACK RIGHT = dark FRONT RIGHT & BACK LEFT = dark RIGHT fan = HIGH OR LEFT fan = HIGH OR RIGHT fan = HIGH LEFT fan = LOW & Right propulsion = HIGH Left fan = HIGH & RIGHT fan = LOW Continue until middle sensor reads dark

Final Design: Control Algorithm Does photoresistor read dark?YesNo Rotate 1→ 2 Rotate 2→ 1 Extend 1→ 4 Rotate 4→ 3 Rotate 3→ 4 Unextend 4→ 1 Drop payload

Bill of Materials ItemManufacturerVendorQuantityCost Per Unit Wood (Sanded Plywood) N/A Home Depot1$9.97 Foamular Project PanelFoamularHome Depot1$5.48 Ripstop Nylon, grayN/AJoAnn's Fabrics1$7.99 VelcroVelcro USAHome Depot1$3.38 Spray paintRust-oleumHome Depot2$3.87 Ladder3D Printer at Mckeldin 1$1.2 CardboardN/A 1$.50 3D-printed payload delivery system 3D Printer at Mckeldin 1$20 TapeN/A 1$2 12V 4200mAh BatteryPowerizerbatteryspace.com1$49.95

Bill of Materials ItemManufacturerVendorQuantityCost Per Unit 7.2V BatteryVenom PowerHobbytown USA1$20.66 Arduino Uno ArduinoENES1001$25.00 TSL237 Sensors Parallax Inc. 5$2.99 DiodesN/ARadioshack3$1.00 MOSFETN/AENES1003$1.00 PhotoresistorN/ASeeedStudio1$0.50 PerfboardN/ARadioshack1$3.49 Heat SinksN/AENES1003$2.00 Hitec ServoN/AA Main Hobbies2$7.99 Tamiya Connectors N/APololu4$2.25 Propulsion Fans Delta ElectronicsDigikey2$31.82

Bill of Materials ItemManufacturerVendorQuantityCost Per Unit Leviation FanEBM-PapstMouser Electronics 1$68.57 Lev Fan GuardsOrion FansDigikey1$6.48 Prop. Fan GuardsEBM-PapstDigikey4$1.12 Total Cost$345.73

Construction Details: “Big Red” ● Hovercraft design was driven by an overarching theme ● “Big Red” alludes to a fire truck design ● 3D printed payload delivery system - ladder and bucket ● Red deck, red payload supports, chrome tape for skirt

Product Performance/Evaluation ●Almost made it to our design point ●Didn’t qualify for competition but the hovercraft almost works ●Team had good spirit but didn’t exactly follow Gantt chart, which led to missed milestones ●Subgroups didn’t work out how we expected

Conclusion/Lessons Learned ●Hovercraft does not accurately navigate the course ●Building a hovercraft is not easy ●Start planning earlier ●Test individual components more often and sooner ●Be willing to make sacrifices needed to remain on schedule ●Be flexible with switching roles within subgroups ●What is intended does not always happen Conclusion: ●Learned a lot about engineering and teamwork ●We grew as a team and as friends

Acknowledgements Thank you to Ms. Lopez-Roshwalb and Dan Sullivan for the advice and support!