Presentations text content in 1 STUDENT LAUNCH INITIATIVE
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STUDENT LAUNCH INITIATIVE
2010 – 2011AIAA OC SECTIONCDR PRESENTATIONFebruary 7, 2011\
Student Launch Initiative
AIAA OC Section
Slide2Agenda
Introduction of team members (representing 5 high schools in Orange County California)Changes Since Original Posting Finalized Vehicle – Black BrantParachutes, Motor, RockSim Simulations, Parachute and Descent Rates, Dual Deployment, Payload, GPS Test Plans and ProceduresScale Model – 2.6” Black BrantFlights, and Flight Analysis TestingBlack Powder, Battery Life, GPS RangeWebsiteEducational Engagement Questions
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Slide3Changes Since Original Posting
Added slide 3Modified slide 4Modified slide 5Split slide 5Modified slide 6Modified slide 8Added slide 9Modified slide 15Modified Slide 16Modified slide 17Added slide 21 Modified slide 22Modified slide 23Modified slide 24Added photos to several slides
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Slide4Final Vehicle – Black Brant
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ParameterMaterial/MeasureParameterMaterial/MeasureDiameter4 inchesLength87.5 inchesBodyG-10 fiberglassFinsG-10 fiberglassLiftoff Wt17.9 poundsDescent wt15.44 poundsCp64.3 inches from tipCg55.48 inches from tipStability Margin2.21 : 1Motor RetentionAeropack Qwik change motor retainerThrust/wt8.28:1Launch1” rail 6 feet long
Slide5Drogue Parachute
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Drogue Parachute DetailsDrogue Parachute24” TAC-1 (Giant Leap Rocketry) gives 65 ft/s descentDrogue material1.9oz low porosity ripstop nylon weight=8oz (estimate)Drogue Construction4 shrouds ½” nylon (1400 lb test) continuous across parachuteSwivel1500 lb testShock CordTubular Nylon 5/8 inch, 15 feet long, 2250 lb testAirframe space available4” diameter x 10” long (approx 125 cu in) (8” usable)Airframe space required (Lineal inches) parachute/shock cord2 inches/1.5 inchesBlack powder for drogue1.02 gramsPressurization details16 psi - 200 lbs (3x#2 screws @ 35lbs each + friction)
Slide6Main Parachute
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Main Parachute DetailsMain Parachute72” TAC-1 (Giant Leap Rocketry) gives 20 ft/s descentMain material1.1oz low porosity ripstop nylon weight=18ozMain Construction4 shrouds ½” nylon (1400 lb test) continuous across parachuteSwivel1500 lb testShock CordTubular Nylon 5/8 inch, 15 feet long, 2250 lb testAirframe space available4” diameter x 17” long (approx 214 cu in)Airframe space required (Lineal inches) parachute/shock cord12 inches/1.5 inchesBlack powder for Main1.74 gramsPressurization details16 psi - 200 lbs (3x#2 screws @ 35lbs each + friction)
Slide7Cesaroni K635 Redline
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Pro54 1994K635-17A
Motor Data BrandnamePro54 1994K635-17AManufacturerCesaroni TechnologyMan. Designation1994K635-17ACAR Designation1994-K635-17ATest Date7/6/2003Single-Use/Reload/HybridReloadableMotor Dimensions mm54.00 x 488.00 mm (2.13 x 19.21 in)Loaded Weight1989.90 g (69.65 oz)Total Impulse1749.50 Ns (393.64 lb.s)Propellant Weight1281.00 g (44.84 oz)Maximum Thrust728.70 N (163.96 lb)Burnout Weight658.40 g (23.04 oz)Avg Thrust656.00 N (147.60 lb)Delays Tested17 - 7 secsISP139.30 sSamples per second1000Burntime2.66 sNotesRed Lightning™
Slide8Motor Selection
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Motor Properties
Manufacturer
Cesaroni
Motor Type
K635 Redline
Max, Average Thrust
(
Newtons
)
656
Total Impulse
(Newton – Seconds)
1749.5
Mass
of Motor Before and After Burn
(Pounds)
4.38/1.45
Slide9RockSim Simulation Results
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Property
O MPH
Wind
15 MPH Wind
Motor
Cesaroni
K635
Cesaroni
K635
Velocity at end
of 6ft rail
56 ft/sec at .251 seconds
56 ft/sec at .251
seconds
Maximum vertical acceleration
435 ft/sec2
434 ft/sec2
Maximum velocity
678 ft/s (V) 0.0 ft/s
(H)
668 ft/s (V) 22 ft/s (H)
Maximum range from launch
0 feet
1077 feet
Maximum
altitude
5213 ft
5095 feet
Drogue
Deployment
Time=17.6
seconds
Time=17.4 seconds
Drogue
Deployment (cont’d)
Alt=5213 ft Velocity=0 ft/sec
Alt=5095 ft Velocity=63 ft/s
Main Deployment
Time=66 seconds
Time=68
seconds
Main Deployment (cont’d)
Alt=900 ft Velocity=88 ft/sec
Alt=900 ft Velocity=85 ft/sec
Time to landing
99 seconds
109 seconds
Slide10Parachute and Descent Rates
Rocket mass = 247.09 oz (Descent Mass)Drogue chute diameter = 24 in.Main chute diameter = 72 in.Calculated projected velocity for each chute with online calculator and by hand (http://www.rocketreviews.com/tool_descent_rate.shtml)FD = ½ (ρ)(Cd)(A)(v2)Cd = 1.00FD = mg = (7.00 kg)(9.8 m/s2)ρair = 1.22kg/m3Hand: vdrogue = 65.43 ft/s Online: vdrogue = 63.51 ft/sHand: vmain = 20.49 ft/s Online: vmain = 20.09 ft/s
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Slide11Dual Deployment
Electronics: MAWD Perfect Flight, HCX G-Wiz PartnersThe electronics will “back” one another up incase one pyro (either drogue or main) does not fire.Drogue Parachute will be deployed at apogeeMain Parachute will be deployed at 900ftThe electronics have been tested four tests have been done:Christmas tree light test Vacuum Chamber testFirst flight in the scale rocket (MAWD Only)Second Flight in scale model (MAWD Only)
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Slide12Dual Deployment Tests
Christmas Tree Light:Vacuum Chamber:First Launch
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ElectronicSuccessfulMAWD Perfect FlightYesHCX G-Wiz PartnersYes
ElectronicSuccessfulMAWD Perfect FlightyesMAWD Perfect FlightyesHCX G-Wiz PartnersNoHCX G-Wiz PartnersYesHCX G-Wiz PartnersYes
Flight
Height
Successful
First Flight
1938
Yes
Second Flight
1740
Partial
Slide13Payload
G-Wiz Partners HCX flight computer - measures acceleration of the rocketToshiba hard drive – test subject; we will run a Linux script on the hard drive over and over again; the time the hard drive takes to run the script each time is measuredSimple net computer/Linux computer – the mini computer that will execute the Linux script on the hard drive; it will be initialized by a PC; the flight data will be recorded on a flash drive inserted into this computerPower converter – Keeps a steady flow of power to the payload components
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Slide14GPS TRACKING
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Transmitter in Vehicle Big Red Bee Beeline GPS RF: 17mW on 433.920 MHz Battery and life: 750mAh 10 Hrs Size: 1.25” x 3” 2 ounces
Ground Station Receiver: Yaesu VX-6R TNC: Byonics Tiny Track 4 GPS: Garmin eTrex Vista
Beeline receives GPS position
Encodes as AX.25 packet dataSends as 1200 baud audio on 433.92 MHzVX-6R receives at 433.92 MHz and extracts audioTinyTrack 4 converts audio to digital NMEA location dataGarmin displays the digital location data on human screen
Slide15Test Plans and Procedures
February 12 launch Scale model (Note: 1st launch was January 1) Test dual Deployment (MAWD and HCX) Ejection charges Full Scale model Test with modified ejection charge amountLaunch Full Scale Model March 5 and/ or March 12
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Slide16Scale Model – Black Brant
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ParameterMaterial/MeasureParameterMaterial/MeasureDiameter2.6 inchesLength62.35 inchesBodyG-10 fiberglassFinsG-10 fiberglassLiftoff Wt5.1 poundsDescent wt4.56 poundsCp51.2 inches from tipCg43.99 inches from tipStability Margin3.19 : 1Motor RetentionAeropack Qwik change motor retainerThrust/wt6.7:1Launch1” rail 6 feet long
Slide17Scale Model – Black Brant
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Scale modelEngineCesaroni H152Size of shock cord5/8” (sustainer) ½” (top section) flat nylonLength of shock cord15 feet (sustainer) 10 feet (top section)Drogue parachute15 inch rip stop nylonMain parachute30 inch rip stop nylonBlack powder for drogue1.01 gramsBlack powder for main1.14 grams
Slide18Scale Model Test Flights
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Click here for video on aiaaocrocketry.org
Slide19FaultMost probable causeHow we are going to fix itInstability when reaching apogeeTeam rushed to get in one more flight and did not notice fillets on fins over the tailcone had cracked (West Systems Epoxy was used everywhere except fillets which were hobby shop epoxy)Ultilize time more wisely, and not look over look any ‘small’ detail – use fiberglass tape on fins especially over gel coat on tailcone and never use hobby shop epoxy anywhere – even just filletsDrag/impulse SeparationDid not use shear pins on main per advice of an on-site “mentor” at the launch (“rocket is so small you don’t need them”)Follow the design and don’t let others misguide you
Scale Flight Analysis
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First flight to 1938 ft was very acceptable and proved design was stable
Second flight to 1749 ft began well, but:
Showed a problem with wobble as it approached apogee
Deployed both drogue and main together
Slide20Testing
All the testing we have done is to help insure that our rocket is safe
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Testing that has been done includes:
Black Powder
Battery
Life
GPS
Range
Scale
Model Launch
Slide21Testing – Black Powder
The table below shows the testing our team has done with black powder charges. How we did the testing was by assembling the rocket as we normally would but through the pressure hole we put a wire to a battery to fire charges
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Located AmountSuccessfulScale – Main1.01yesScale – Drogue1.14 gramsyesFull – MainRocket not completed Full – DrogueRocket not completed
Slide22Testing – Battery Life
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Electronics
Life time (hours)SuccessfulHCX G-Wiz Partners 2.5YesMAWD Perfect Flight 36 (and still going)YesBig Red Bee Beeline GPS 18.7 (and still going)YesPayload 3.74 (and still going)Yes
Each device tested began with a new or just charged battery and ran under conditions close to sitting on the pad. Results were measured using a DATAQ Instruments DI-194RS four channel analog to digital converter
Slide23Testing – GPS Range
Our team first let the electronics connect to satellites, once it had done that then we started to walk away from the transmitter (Big Red Bee Beeline) and saw how far it would transmit while being in the rocket.
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Transceiver LocationRangeSuccessfulOn the ground3.05 milesYes
Slide24Website
aiaaocrocketry.org Contains a separate tab: SLI 2010-2011DocumentsCalendersMSDSSLI Photos/Videos ManualsAllows for the team members to stay updated
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Slide25Educational Outreach
Cloverdale 4-H club
Girl Scouts workshop Presentations to Sunny Hills HighSchool Science classes to get involved Help out ABC Unified School Districtwith their annual Science OlympicsArticles published/ will be publishedin the Orange County Register,The Foothill Sentry, and the Sunny Hills High School AccoladeWe have contacted the Discovery Center to participate in their Youth BoothWe are going to have a booth at Youth Expo (4/8 – 4/10) and teach kids how to build rockets while informing them on SLI and other cool aerospace careers – approximately 2,600 students will be dropping byIn the process of contacting corporations regarding fundraising
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Slide26Thank you for letting us be part of SLI
Questions&Comments?
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1 STUDENT LAUNCH INITIATIVE
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