Preliminary Design Review

1. Preliminary Design Review

2. Launch Vehicle • Propulsion • Payload • Recovery

3. Vehicle Dimensions • Total length of 116.5 inches • 4.0” Airframe (3.9” Inside diameter) • Fin span of 3.91” • Separates into three sections Top Nosecone Payload Vertical Wind Turbine Middle Drogue Parachute Piston Altimeters Bottom Main Parachute Motor (Plugged) Fins

4. Materials- Airframe • Entirely BlueTube 2.0 • Heat and Humidity Resistant • Lightweight compared to alternatives Source: Alwaysreadyrocketry.com

5. Materials- Airframe • Exceptionally strong material • Vulcanized paper fiber with water resistant resin • Tubing was “a component inside a warhead of the 155mm Howitzer, and 105mm Abrams Tank ordinance” –Always Ready Rocketry • Is expected to withstand forces of launch

6. Materials- Airframe • Maximum load of 3079 lbf (3 inch tube) • Peak Stress of 5076 psi (3 inch tube) • Impact resistant Source: Alwaysreadyrocketry.com Source: Apogeerockets.com

7. Materials- Fins • Fins • Composite board with hardwood edging • Fiberglass outer layer • Honeycomb Nomex composite inside • Must have edging to airfoil Photos from GiantLeapRocketry.com

8. Materials- Fins • One-Third the weight of G10 Fiberglass • Retains rigidity • Airfoil edging will be of birch plywood • Surface will be scored with hobby knife and drilled into to increase surface area • Through-the-Wall assembly to the motor mounting

9. Materials- Fins

10. Materials- Epoxy • Loctite 30 minute Epoxy • All motor mounting and internal parts • Allows for absorption time • Less brittle, stronger bond • Loctite 5 minute Epoxy • Fin Fillets

11. Bulkheads & Centering Rings • 4-ply birch plates • Each 3/16” thick • All rings and bulkheads will be double thick • Overall stronger plate • More surface area to glue to

12. Materials- Other • Vertical mounting boards • 1/4” to 3/8”plywood • Used in payload and electronics bay • Nose cone • Impact resistant plastic • Tail cone • Urethane tail cone from Public Missiles to reduce drag

13. Stability Margin • Stability margin of 2.01 calipers before launch • Fins will be constructed last • Fin size will be adjusted to keep this value

14. Stability Analysis • 2.01 stability margin will allow for error • Small drag forces from: • Nosecone screws • Solar panel’s edge • Pressure bleed off holes • Miscellaneous • Margin will rise to 3.35 calipers after burnout

15. Vehicle Safety Verification • Sub-scale launch Dec. 11th (backup Dec. 18th) • Verifies stability and altimeter setup • Strength tests on fins and bulkheads • Heat, humidity, and warp testing • Oven, freezer • Soak in water • First full scale launch in early February with dummy payload

16. Construction Safety • All personnel trained to use power tools • Two people working on a part minimum • Gloves, aprons, and goggles during construction • Masks when products with fumes are used • Epoxy • Paint

17. Launch Vehicle • Propulsion • Payload • Recovery

18. Motor Selection • Aerotech K700W • Plugged forward closure • Current projected dry mass = 15.4 lbs • Will have room for error

19. Motor Selection • Propellant from Giant Leap Rocketry • Hardware from Apogee Rockets • AeroTech RMS-54/2560 casing • Plugged forward closure • Eyebolt threads for solid parachute mounting point Source: Apogeerockets.com

20. Thrust to Weight Ratio • Thrust to weight = 6.81 to 1 with current plan • Acceleration of 364 ft/s2 on Launch • 11.3 G’s • Rail Exit Velocity = 81.0228 ft/s

21. Thrust Curve Source: ThrustCurve.com

22. Plan for Motor Safety Verification • Inspect for any cracks or dents on casing • Certified personnel assemble motor • George or Jack Sprague (Mentors) • Inspect assembly • Aerotech K700 motor is not a prototype and has been launched before

23. Launch Vehicle • Propulsion • Payload • Recovery

24. Baseline Payload Design • Measures voltage and current output of a flexible solar panel • Observe changes in the strength of the Earth’s Magnetic Field • LabPro Data logger records from all sensors simultaneously • Accelerometer triggers data recording • Data stored inside rocket, until retrieval

25. Payload Design- Structure • Housed in the Modular Payload System (MPS) • Three compartments • Sensors secured with metal strapping • All plywood • Stainless steel support rods

26. Data Logging System • LabPro Data Logger from Vernier • Programmed to start taking data when accelerometer reads 7 G’s of acceleration • Longer pad stay time, can take many readings from just ascent and descent • Supplies power to all sensors • Lithium AA batteries for reliable power source

28. Solar Panel System • Solar Panel, current probe, voltage probe, resistors, and data logger • Voltage probe in parallel around a 10 ohm resistor • 30 ohm resistor in series to burn off voltage for sensors • Current probe in series • Solar panel leads go through airframe to sensors

29. Solar Panel

31. Flexible Solar Panel • Two donated by FlexSolarCells.com for experiment

32. Magnetic Field System • Vernier magnetic field sensor • Isolated from all other electronics to reduce risk of interference • Will measure a peak voltage when sensor points to magnetic South • Rocket must spin so that we know it points South at some time

34. Magnetic Field Probe • Field strength across the globe varies from 3.1 x 10-5 to 5.4 x 10-5 Teslas • Typical variance in 25 nano Teslas on a given day in one location

35. Vertical Wind Turbine • Magnetic Field sensor reads peak when pointed at magnetic south • Catches horizontal wind and causes the rocket to spin

36. Significance • Solar power is becoming cheaper and easier to integrate • Viability of flexible solar on objects where direct sunlight is not always possible • Magnetic field experiment could be used in the future for detailed data on the changes in the Earth’s magnetic field

37. Plan for Payload Verification • System ground testing • Set up all sensors and record sample data • Will onboard electronics interfere with magnetic field sensor? • Strength test components of MPS for the amount of G-forces it will go through • Double check that systems working before launch • Use new batteries before every launch

38. Launch Vehicle • Propulsion • Payload • Recovery

39. Baseline Recovery System Design • 24” TAC-1 Drogue Parachute at apogee • Backup ejection 2 seconds after apogee • 84” TAC-1 Main Parachute at 700 feet • Backup ejection at 500 feet • Swivels on each parachute • PerfectfliteMiniAlt/WD and HiAlt45K altimeters • Radio transmitter for locating the rocket after landing

40. Recovery System • Shock cord is 9/16” wide nylon strap • 2000# rated • 26’ on drogue 20’ on main • Quick-Links for easier chute packing and repairs (if needed) • U-Bolt parachute mounts • Altimeter ejections have been staggered • Reduce risk of over-pressurizing airframe

41. Flight Events and Ejections Engine Burnout Primary Main Chute Ejection (700 feet) Backup Drogue Chute Ejection (2 sec after apogee) Primary Drogue Chute Ejection (at apogee) Backup Main Chute Ejection (500 feet)

42. Electronics Bay • Each altimeter will have its own 9V battery and arming switch • All connections will be secure so that no circuit breaks occur

43. Plan for Recovery Safety Verification • Ejection charge ground tests in January • Verify descent velocities with Rocksim • Verify vertical wind turbine does not tangle cords • 2000 lbs rated heavy-duty 9/16” nylon shock cord • Altimeter testing in a vacuum chamber • Verify function of radio transmitter in a ground test • Use ohm meter to check ejection canisters before installing into rocket

44. Questions?