yough cougar rocketry team
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Yough Cougar Rocketry TeamYough Cougar Rocketry TeamHerminie,
Pennsylvania
Project Dorothy
NASA SLI 2008
Critical Design Review
Herminie, Pennsylvania
Project Dorothy
NASA SLI 2008
Critical Design Review
Amy Rene’ BickerstaffAmy Rene’ BickerstaffTeam Lead
Vehicle DesignScheduling Manager
Ashley WileyAshley Wiley
NAR & FAA RegulationsFlight Control
Payload
Stephanie AbbottStephanie AbbottSafety Operations Manager
Josh SarosinskiJosh Sarosinski
Hazardous MaterialsEnvironmental Concerns
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 thana 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 launchesthus far, which should indicate successful flight of the full scale design.
General Assembly of Dorothy II
General Arrangement of
Dorothy II
Outline of Dorothy II
Thrust Data for L1150
Thrust data for L900RR
Launch Rail Exit Velocities
Launch Rail Exit Velocities
• The Aerotech L1150 motor• 48.9 ft/sec
• Animal Motor Works L900RR• 35.65 ft/sec
• The Aerotech L1150 motor• 48.9 ft/sec
• Animal Motor Works L900RR• 35.65 ft/sec
The L1150 provides a sufficient velocity to ensurestable flight from a 60 inch rail. The L900RR would need a 90 inch rail to achievea desired rail exit velocity of 44 ft/sec.
Descent Rate of Dorothy II
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
• 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 fromhttp://www.onlinetesting.net/cgi-bin/descent3.3.cgi
Ejection Charge TestEjection 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
• 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
Ejection Charge AmountEjection 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
• 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
Ejection Test ProcedureEjection 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
• 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
Ejection Charge TestingEjection Charge Testing
Ejection Charge TestingEjection Charge Testing
The piston design proved to be very successful.Using 1 gram of 4Fg powder, the nosecone wassent about 20 feet into the yard. The only issuediscovered was that the bulkplate in the pistonseparated from the tubing. This will be correctedby using HP-20E Hysol epoxy rather than the slow cure CA glue.
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
» 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
Notes from Scale Launch
Quest A6-3 motor used10 - 15 mph winds, gusts to 20 mphNearly perfectly vertical flight during
the thrust portion of the flightVery little drift during coast phase Ideal launch considering a low thrust
motor was selected
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
Electronics
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
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
Community OutreachCommunity 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
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
Funding IssuesFunding 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 ???
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 ???
SLI Grant moniesSLI 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
$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
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
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
In ClosingIn Closing
Great Progress has been madeLearned from last year
New members working wellMore is being accomplished
Improved design of deploymentPiston / Sabot ejection system
Money is an issueFunding changes need addressed
Keep working hardRewards are coming soon
Thank youNASA’s MSFC makes it happen
Great Progress has been madeLearned from last year
New members working wellMore is being accomplished
Improved design of deploymentPiston / Sabot ejection system
Money is an issueFunding changes need addressed
Keep working hardRewards are coming soon
Thank youNASA’s MSFC makes it happen
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