Download - Flight Readiness Review
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The Efficiency of Flexible Solar Panels and Changes in the Earth’s Magnetic Field at Altitude
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Vehicle Summary
• Total length of 116.5 inches• 4.0” Airframe (3.9” Inside diameter) • BlueTube 2.0• Separates into three sections• 22.3 pounds with motor• 17.0 pounds without motor
TopNoseconePayload
Flip-Out Rotor Blades
MiddleDrogue Parachute
AltimetersHousing for Rotor Blades
BottomMain ParachuteMotor (Plugged)
Fins
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Payload Summary
• Studying the efficiency of flexible solar panels, and changes in power output
• Also investigating changes in the earth’s magnetic field
• Housed in the Modular Payload System (explained later)
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Vehicle Changes
• Piston added to the main parachute compartment to deploy the main parachute
• Hinges on flip out rotor blades have been upgraded from mouse traps to small door hinges with rat trap springs
• Dry weight is now 17.0 pounds
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Payload Changes
• Slots in the Modular Payload System have been enlarged to slide over solar panel wires– Reduces the risk of shearing wires inside
airframe
• Because of the solar panel, a hole cannot be drilled through the airframe to verify payload on pad
• Payload will have to be activated and verified before installing
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Motor Selection
• Aerotech K828 FJ
• 54/2560 mm casing
• Proven to take rocket to projected altitude
Motor ManufacturerTotal Impulse (N-
sec)Max Thrust (Newtons)
Burn Time (s)
Average Thrust (Newtons)
Thrust to Weight Ratio
K828 AeroTech 2120.0 1,303.8 N 2.50 828 8.35 to 1
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Estimated Rocket Performance
• Estimating a coefficient of drag of around 0.55• Dry weight of 17.0 pounds
Note: Simulations calculated with 5 mph winds
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Motor Thrust Curve
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Rocket Flight Stability Margin
• Center of gravity 73.4 inches from nose
• Center of pressure 87.5 inches from nose
• Stability margin of 3.50 calipers
• Stability of 4.86 calipers after burnout
CG Position: about 74 inches from noseCP Position: 87.5 inches from nose
Stability Margin: about 3.38
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Thrust to Weight Ratio
• Thrust to weight ratio is 8.35 to 1
• High acceleration of approx. 459 m/s2 (14 g’s)
Acceleration (ft/s2) vs. Time (s)
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Rail exit velocity
• 8 ft Rail = 75.0 ft/s• 10 ft Rail = 83.3 ft/s• 12 ft Rail = 90.8 ft/s
• Planned to launch using a 10 ft rail• 12 ft rail was used for test flight• Lugs compatible with Standard 1” Black
Sky Rails
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Parachute Sizes and Descent Rates
• Drogue parachute: 24 inch diameter TAC-1• Four flat strap nylon suspension lines• Deploys at Apogee (backup charge 2 seconds
later)• Drogue descends at approx. 71 ft/s• Swivels are attached to each parachute• Additional swivel attached to drogue mount
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Parachute Sizes and Descent Rates
• Main parachute: 84 inch diameter TAC-1• Four flat strap nylon suspension lines• Deploys at 700 feet (backup charge at 500 feet)
• Estimated descent rate of 19 – 20 ft/s• Drift in 5 mph= 500 feet• Drift in 10 mph= 900 feet• Drift in 15 mph= 1800 feet
Large Margin of Error
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Test Plans and Procedures
• BlueTube airframe was able to withstand 300 pounds of force of compression without signs of failure
• 350 degrees for 30 minutes = ⅛” increase in circumference
• Freezer for 30 minutes = No notable change• Underwater for 30 minutes = Tube began to
wrinkle• 5 hours in sun = No warping found
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Test Plans and Procedures
• Decal radiant heat test• A precaution for BlueTube warping from uneven
heating
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Test Plans and Procedures
• Exposed to light for 10 minutes (temp leveled off)
• Four trials in 2 different positions to limit bias• Replacing black with white in color scheme
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Test Plans and Procedures- Assembly
• Before loading ejection canisters with black powder on launch day continuity will be verified in all electric matches with altimeters
• No cell phones or unnecessary electronics in work area• Parachutes and piston are to be coated in talcum
powder before installing• All six quick-links must be verified at least once by two or
more people• At launch pad igniter is to be installed AFTER activating
altimeters
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Test Plans and Procedures
• All sensors for payload have been verified and function as planned– Sensors must be zeroed before use for best results
• Accelerometer– Held up for 5 seconds, down for 5, shook, then hit against palm
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• The magnetic field sensor was rotated clockwise to check functionality
• Peak readings when pointed to magnetic south (geo graphic north) as expected
• Does not appear to be affected by other sensors
Test Plans and Procedures
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• The ground station has been completed and tested• Solar panel, current probe, voltage probes, and resistors
are set up like in rocket• In full sun 1.184 V around 10 ohm resistor and .2491 A• Total voltage difference = 9.12 V, Total power = 2.27
Watts
Test Plans and Procedures
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Full Scale Flight Test • Feb 26th Launch cancelled to lack of FAA waiver• One full scale flight was completed on Sunday,
March 6th
• Notable turn into wind off of launch rail
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Full Scale Flight Test • NO main parachute deployment• Rocket landed under drogue in soft field• Only damage to rotor blade hinges• Altimeters read 5219 feet and 5267 feet
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Full Scale Problems
• Main parachute was stuck in airframe• All flights suspended until problem resolved• Next launch cancelled because of problem, high
winds, and closing of field in Waco
Full Scale Conclusion• Rocket structure can handle forces of flight• Main parachute system now resolved • Rotor blades repaired and upgraded• Ready for flight
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Dual Deployment Avionics Test
• Completed on Monday, December 13th
• Altimeters placed in a vacuum chamber• Both altimeters showed a drogue and main deployment• All ejection charges were detonated during launch
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Ejection Charge Amount Test • Drogue parachute tests completed February 19th
and February 21st
• 2.3 grams of FFFF black powder• Successful separation, deployment of drogue,
and deployment of rotor blades
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Ejection Charge Amount Test
• Main parachute tests on February 21st, March 12th, 18th, and 19th
• On Feb. 21st parachute pulled roughly halfway out of tube
• Minimal force required to release parachute• Parachute was believed to deploy on the 21st,
because drogue parachute would act as a pilot chute
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Ejection Charge Amount Test
• Parachute failed to separate from airframe on first test launch
• Tests were redone with parachute packed tighter and talcum powder
• Test failed to pull out parachute
• Lack of moving mass, lack of force
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Parachute only halfway out of airframe
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Main Parachute Ejection Options
1. Add more black powder2. Add mass to electronics bay3. Wrap shock cord around parachute4. Use a piston recovery system5. Use a parachute bag6. Move separation joint closer to parachute7. Attach a ball below parachute to pull out
parachute
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Main Parachute Ejection• On 7th main parachute test (10th overall)
main parachute ejects with a piston system
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Payload Integration Feasibility • All sensors and data logger are made by Vernier
Software and Technology• Data logger is also power source for all sensors• LabQuest has been modified by Vernier to fit
into the payload airframe• To retrieve data the data logger unit must be
retrieved
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Payload Integration Feasibility
• All units contained in the Modular Payload System (MPS)
• Constructed out of birch plywood• Two ¼” threaded steel rods for structural integrity• Excess wiring will be coiled and stored in bottom section
of MPS• Slots cut in bulkplates to allow for wiring to pass from
one section to another• Must be installed facing specific direction to slide over
solar panel wiring
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Modular Payload System
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Payload Integration
• Slots in MPS slide over solar panel wiring
Terminal block where positive and negative leads from solar panel connect to payload
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Removal of the MPS• Nosecone must be removed• A strap will be connected to the two stainless steel
rods the can be used to pull out the MPS
• When the mid section is exposed the wires from solar panel are disconnected
• The entire unit is taken to computer for data retrieval via USB cable
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Educational Engagement Plan & Status
• Status: Complete• 160 Students engaged at Rockwall-Heath High School• February 10th- Students designed fins in Rocksim and
constructed fins at home• February 14th- Approximately 80 rockets were built
during school hours. All parts were supplied other than fins and egg padding
• February 26th- Rockets were launched at Tate Farms, a local ranch
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Educational Engagement Plan & Status
• February 15th and 16th the team visited Cain Middle School
• Students who volunteered to stay after school received a brief presentation
• Students then built rockets from paper and other scratch materials
• Rockets were launched on February 26th as well
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Questions?