Yough Cougar Rocketry Team

1. Yough Cougar Rocketry Team Herminie, Pennsylvania Project Dorothy NASA SLI 2008 Critical Design Review

2. Amy Rene’ Bickerstaff Team Lead Vehicle Design Scheduling Manager

3. Ashley Wiley NAR & FAA Regulations Flight Control Payload

4. Stephanie Abbott Safety Operations Manager

5. Josh Sarosinski Hazardous Materials Environmental Concerns

6. RockSim Drawing of Dorothy II The center of gravity is located 11 inches aft of the coupler. This design is to allow a helicopter style descent rather than a ballistic trajectory in the event of recovery failure. Currently there is a 4.97 caliber level of stability. No wobble has been detected in smaller scale test launches thus far, which should indicate successful flight of the full scale design.

7. General Assembly of Dorothy II

8. General Arrangement of Dorothy II

9. Outline of Dorothy II

10. Thrust Data for L1150

11. Thrust data for L900RR

12. Launch Rail Exit Velocities • The Aerotech L1150 motor • 48.9 ft/sec • Animal Motor Works L900RR • 35.65 ft/sec The L1150 provides a sufficient velocity to ensure stable flight from a 60 inch rail. The L900RR would need a 90 inch rail to achieve a desired rail exit velocity of 44 ft/sec.

13. Descent Rate of Dorothy II • Classic 60 SkyAngle Parachute • 30.06 ft/sec • Large SkyAngle Cert - 3 Parachute • 24.31 ft/sec • XL SkyAngle Cert - 3 Parachute • 17.12 ft/sec Data gathered from http://www.onlinetesting.net/cgi-bin/descent3.3.cgi

14. Ejection Charge Test • 4 inch tubing with aluminum bulkplate • Glow plug ignition • 4 inch coupler, 4 inches in length with bulkplate to form piston • Attached to the aluminum bulkplate with stainless steel cable • Stainless steel cable cut to a length to prevent piston ejection from tube • 4 inch coupler, 30 inches in length to mimic sabot • Will impact nosecone bulkplate • Test nosecone created

15. Ejection Charge Amount • 20 psi desired inside airframe • Piston style ejections use less powder • Equation shows only .64 grams of powder required to eject • CDR Recovery Subsystem • Multiple tests to ensure proper ejection

16. Ejection Test Procedure • Slide piston into airframe • Measure 1 gram of 4Fg powder • Pour powder into chamber • Insert chamber into airframe • Insert coupler tube into airframe • Install nosecone by attaching U-bolt • Secure test apparatus • Energize glow plug

17. Ejection Charge Testing

18. Ejection Charge Testing The piston design proved to be very successful. Using 1 gram of 4Fg powder, the nosecone was sent about 20 feet into the yard. The only issue discovered was that the bulkplate in the piston separated from the tubing. This will be corrected by using HP-20E Hysol epoxy rather than the slow cure CA glue.

19. 1/4 Scale Test Flight • Click the link to view the video of the test launch. • Windows Media Player • Windows Media Player of Quarter Scale Dorothy Rocket • QuickTime Video File • Apple QuickTime of Quarter Scale Dorothy Rocket

20. Notes from Scale Launch • Quest A6-3 motor used • 10 - 15 mph winds, gusts to 20 mph • Nearly perfectly vertical flight during the thrust portion of the flight • Very little drift during coast phase • Ideal launch considering a low thrust motor was selected

21. Deployment System • PerfectFlight LC800 Dlx Altimeters • Dual Event Logging • Ejection at Apogee via pressure sensor • Main ejection at 800 feet • One powder charge with two E-matches • Piston pushes Sabot with parachute • Sabot peels away • Still retained by kevlar chord • All pieces remain attached to the launch vehicle

22. Electronics

23. Sabot Ejection System • Fiberglass coupler cut in half to form sabot • Fiberglass bulkplate, hinged in the center to allow sabot opening • Forward portion of sabot impacts nosecone bulkplate upon ejection sheering the nylon pins • SkyAngle parachute begins to deploy • Whirlybirds begin to disperse when sabot peels back • Payload protective bags not required • May still be used to eliminate burning of parachute

24. Payload Integration • Split Sabot contains all payload • Whirlybirds placed along main axis • Main parachute above whirlybirds • Upon ejection, sabot opens to release parachute and whirlybirds • No payload protection required as piston contains ejection gases • Odd shaped items work easily inside sabot since they do not need to slide up the airframe for ejection

25. Community Outreach • Computer Refurbishing and Sales • Computers saved from landfills • Community can purchase internet ready computers at very low cost • Chinese Auction • Items donated from Pittsburgh Steelers, Pirates, and Penguins • Seven Springs Mountain Resort • Giant Eagle Food store • Westmoreland Mall • Westinghouse • Display during lunch • Funding

26. Funding Issues • Student Outreach Drastically Modified • Quest Starhawk rockets to be given away during Chinese Auction sale days • Rocket Fair to pick prizes and launch rockets • $ 3780 raised selling computers • $ 1500 for candy sales • Are we going to make it ???

27. SLI Grant monies • $1250 SLI grant uses ( all gone !!! ) • Purchase Quest Starhawk rockets • $ 300 • Purchase Quest Flight Packs for launches • $ 177 • Replacement Parts lost during SLI 2007 • Over $ 500 so far • FedEX fees for shipping • $ 300

28. Exit 8 - Huntsville • Huntsville Trip in April • Trip Total estimated to be - $ 6875 • Airfare - $275 per ticket - $ 2750 total • Lodging - $425 per room - $ 2125 total • Meals - $200 per person - $ 2000 total

29. Looking into the Future • Complete construction of Dorothy II • Perform ejection charge testing • Continue analysis of whirlybird flight • Attempt construction of Data Ball • Launch 66% scale version with payload • Continue fundraising efforts

30. In Closing • Great Progress has been made • Learned from last year • New members working well • More is being accomplished • Improved design of deployment • Piston / Sabot ejection system • Money is an issue • Funding changes need addressed • Keep working hard • Rewards are coming soon • Thank you • NASA’s MSFC makes it happen