| Physical properties | Simulation data |
|---|---|
| Length: 190 cm | Apogee: 1.85 km |
| Diameter: 10.2 cm | Time to apogee: 18.9 s |
| Reference area: 81.1 cm2 | Flight time: 135 s |
| Weight: 3.20 kg (with motor) / 1.92 kg (without motor) | Maximum velocity: 193 m/s |
| Stability: 1.71 cal (with motor) / 5.04 cal (without motor) | Ground hit velocity: 4.95 m/s |
| Coefficient of drag: .510 | Launch velocity: 19.9 m/s |
| Type | Material | Dimensions (cm) | Weight (g) | Details |
|---|---|---|---|---|
| Nose cone | Polypropylene | 41.9 x 10.2 Shoulder: 8.26 x 9.84 | 298 | • Tangent ogive shape |
| 2x body tubes | Carbon fiber reinforced polymer (CFRP) | Fore: 47.0 x 10.2 Aft: 91 x 10.2 | Fore: 124 Aft: 241 | • 4x wrap |
| Midsection | Phenolic | 6.00 x 10.2 | 35.7 | • Allows GPS and WiFi signals to penetrate the body tube • Contains holes for pressurization |
| Boat tail | CFRP | 4.50 x 10.2 (fore), 5.60 (aft) | 10.3 | • Conic shape |
| 4x main fins | CFRP with balsa core | 21.0 root, 10.0 tip, 12.0 height Fin tabs: 21.0 x 2.30 | 38.1 each | • Trapezoidal shape |
| 4x stabilizer canards | CFRP with balsa core | 9.00 root, 2.00 tip, 4.00 height | 3.56 each | • Trapezoidal shape |
| Electronics bay/coupler | Blue Tube with plywood bulkheads | 20.0 x 9.94 | 137 | |
| 3x centering rings | Plywood | 9.94 x .200 | 18.4 each | |
| Motor mount | CFRP | 5.60 x 50.0 | 72.2 | |
| 2x rail buttons | Plastic | 3.20 x 1.61 | 4.80 each | • Attached to body with screws and washers |
| External lens housing | Plastic | 2.00 x 2.00 x 7.00 | 16.7 | • Opening for camera lens |
| Component | Material | Dimensions (cm) | Weight (g) | Details |
|---|---|---|---|---|
| Ejection charge | • Automatically triggered by Arduino to discharge at apogee | |||
| Main parachute | Ripstop nylon | 121 | 116 | • 6x shroud lines: 60 cm • Set to deploy at 91 m |
| Drogue parachute | Ripstop nylon | 34 | 9.32 | • 6x shroud lines: 30 cm • Set to deploy at apogee |
| Shock cord | Kevlar | 300 | 5.40 | |
| Fireproof wrapping | Nomex | 60.0 | 31.4 |
| Potential motors | Dimensions (mm) | Weight (g) | Average thrust (N) | Burn time (s) | Total impulse (N*s) |
|---|---|---|---|---|---|
| Cesaroni J140-WH | 54.0 x 329 | Full: 1280 Empty: 600 Propellant: 680 | 143 | 8.46 | 1211 |
| Component | Dimensions (cm) | Weight (g) | Details |
|---|---|---|---|
| Teensy 3.2 | 3.50 x 1.80 x .100 | 5.00 | • Used in conjunction with breadboard |
| Adafruit IMU | 3.80 x 2.30 x .300 | 2.80 | • Inertial Measurement Unit, contains five sensors • Barometer: 300 to 1100hPa range • Thermometer: -40 to 85 °C • 3-axis accelerometer: ±2g / ±4g / ±8g / ±16g • 3-axis compass: ±1.3 to ±8.1 gauss • 3-axis gyroscope: ±250 / ±500 / ±2000 °/s |
| ESP8266 module | 2.40 x 1.60 x .300 | 2.00 | • Creates WiFi connection |
| GPS module | |||
| 3.3V battery | • Power source for Arduino and attached modules | ||
| 6.0V battery | • Power source for all servos | ||
| 4x Hitachi HS-225BB servos | 3.34 x 1.68 x 4.41 | 27.0 each | • Precision motor control for stabilizer fins • Torque: .473 N*m each • Speed: 60.0° / .11 s |
| Mobius Action Camera | 5.08 x 2.54 x 2.54 | 38.8 | • Resolution: 1080p • Power: Internal rechargeable battery |
| JollyLogic Altimeter3 | 4.90 x 1.80 x 1.45 | 10.5 | • Altitude: 20x / sec • 3-axis acceleration: 200x / sec • Power: Internal rechargeable battery |
| JollyLogic Chute Release | .540 x .310 x .100 | 17.5 | • Power: Internal rechargeable battery |
| Name | Instrument | Purpose | Action |
|---|---|---|---|
| Active stabilization | Arduino, IMU, servos, stabilizer canards | To correct the flight path from the effects of weather, incorrect launch angle, or other undesirable conditions. | Runs at all times during powered and coasting flight. Arduino uses live data from IMU to make small adjustments to stabilizer canards, which in turn keep the rocket on a steady vertical path. |
| GPS tracking | GPS module, Arduino | To send the landing coordinates of the rocket post-flight to a mobile phone to prevent loss of the airframe in the event of high wind. | Runs upon landing. Arduino uses position data from GPS to report final coordinates to remote mobile phone. |
| Selective altitude cutoff | Arduino, IMU, servos, stabilizer canards | To add an element of precision to a flight. | Runs once during select flights. Refuses to run during powered flight to prevent damage to servos and airframe. Arduino uses live data from IMU to calculate altitude, and inverts the stabilizer fins at the programmed altitude, immediately halting the ascent and sending the rocket back toward earth. |
| Selective parachute deployment | Chute Release | To radically decrease coast time while slowing the rocket to a safe landing speed. | Runs once during select flights. Restricts main chute from full deployment until programmed altitude. |
| Flight video | Camera | To review each flight and potentially determine reasons for failure, as well as to provide extra documentation. | Runs at all times during flight. Located inside electronics bay and records video through a lens extension cable from mid body tube down between fins. |
| Data collection | Altimeter3 | To provide redundancy for on-board sensors, as well as to expedite the data export and review process. | Runs at all times during flight. Records altitude and acceleration data in a spreadsheet. Includes wireless exports to a mobile phone. |
| Item | Purpose |
|---|---|
| WeatherFlow Wind Meter | Measures wind conditions (speed and direction) at launch site |
| Android phone | Remotely controls and downloads data from Altimeter3; receives data from GPS tracker; controls Wind Meter; determines temperature, precise launch location, precise launch angle |
| Laptop computer | Creates on-site simulation accounting for real-time weather conditions |
| 12-foot launch rail with remote igniter | Launches rocket |