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Overview• Problem Statement• Timeline• Background• Scope• Brainstorming & Research• Criteria Constraints• Explore Possibilities & Select Approach• Design Proposal• Prototype• Test & Refine
Problem Statement
We need to create a rocket using TARC-approved materials that is capable of
carrying a 60-gram egg to an altitude of 750 feet and safely return it to the ground
using a 15-inch parachute.
Timeline • Problem Statement
(Start date)▫ Nov 19-Nov 29
• Detailed Timeline▫ Nov 29-Dec 3
• Research▫ Dec 6-Dec 17
• Criteria & Constraints▫ Dec 15-Dec 16
• Explore Possibilities▫ Dec 20-Jan 4
• Select an Approach▫ Jan 4-Jan 7
• Design Proposal▫ Jan 7-Jan 28
• Prototype▫ Jan 28-Mar 20
• Presentation Materials▫ Nov 19-May 5
Background
•Competition▫2002▫Largest rocket competition ▫Washington D.C.
•Future of Rocketry ▫Students getting into aerospace▫70% now interested in STEM career▫81% connect math, science & technology
Background (cont.)
•General Rocketry▫“Space race”▫NASA used models to save money
•Safety rules ▫Non-metal materials▫Certified motors only▫Cannot weigh more than 1,500 g▫Cannot launch rocket at targets▫Must use recovery system such
Scope
•Cannot purchase rocket building kit•Perfectflite ALT15K/WD altimeter•Approved rocket motor •Go-Box (from Mr. Pritchard)•Grand total money spent: $300 •Use Mr. Pritchard & Mrs. Brandner for
assistance•Qualification must be by April 4th
Deliverables
•TARC:▫test results
•Mr. Pritchard▫Completed rocket▫CAD drawings▫Final report ▫PowerPoint presentation
•Mrs. Brandner▫Engineering notebook
Brainstorm Questions
•Fuel•Best materials •Ideal size for competition •Types of wings and fins•Competition-approved motors•How NASA propels rockets
▫How we can use to our benefit •Payload
TARC Criteria •Altitude 750 feet•Max propellant 62.5 g•15-in parachute•1000 g Rocket•57-63 g Egg (45 mm)•40-45 sec. Flight•Alt15KA Altimeter•Carry raw egg (max 45mm in diameter &
60g)▫With no damage
•Results must be received before April 4th
Constraints
•All materials (PowerPoint, finished project, and report)▫May 5, 2011
•Must use prior knowledge of math and science
•All progress recorded in engineering notebook
Explore Possibilities
Pros ConsOver 750 feet Egg may not fit40-45 seconds Bulkhead too smallMaterials obtained easily
Paper body tube weak
Reliable motor G-10 Fiberglass fins expensive
Design #1Polystyrene PS noseconePaper body tubeRip-stop nylon parachuteTwo G-10 fiberglass finsShock cordAlt15KA altimeter One bulkhead & centering ring
Explore Possibilities Design #2C2-4 engineAlt15KA altimeter Thick plastic (for wings)PC pipingNylon parachute
Pros ConsMaterials easy to obtain
PVC Body tube too big
Enough space for egg Too cheap & break easily
Reliable engine (C2-4)
May exceed weight limit
More aerodynamic Rocket almost 3 feet
Explore Possibilities Design #3B6-4 engineNylon parachutePlastic finsShock cordAlt15KA altimeter Thick cardboard (for body)
Pros ConsExtra space & shock cord
Motor too weak
Recovery wadding Egg too big for nosecone
Cheap body & nose cone
No space for padding
Large body tube Irregular shaped fins
Select an Approach
Criteria M/O #1 #2 #3Altitude 750 feet M 1 0 0
Max propellant 62.5 g
M 1 1 1
15-in parachute M 1 1 11000 g Rocket M 1 1 1
57-63 g Egg (45 mm) M 1 1 140-45 sec. Flight M 1 0 0
Alt15KA Altimeter M 1 1 1No egg damage M 1 0 0
Under $150 O 1 1 1Reliability O 1 0 0
Ease of Build O 1 1 0Total Score 11 X X
•#2 failed altitude, time & egg criteria•#3 failed altitude & time criteria•#1 passed all mandatory criteria
Design Proposal: Build Process
•Body tube & Motors▫Motor mounts
•Parachute▫Shock cord
•Payload & nosecone▫Padding, plastic bag
•Fins •Final assembly
Design Proposal: Bill of MaterialsPART DESCRIPTION QUANTITY UNIT
COSTShipping TOTAL
Parachute 15.5” diameter nylon 1 chute (6 shroud lines) $5.00 $1.75 $6.75Centering Ring 0.6” dia, 0.25” thick 2 Centering Ring kits $1.35 $4.95 $7.65G10 Fiber glass
Fin7” x 5” x 5” Fiberglass 2 Fins $24 $8.00 $32.00
Altimeter Perfectflite Alt15KA 1 Altimeter $55.00 $0 $55.00Engine Estes C6-3 & D12-3 2 packs of 3 each $10.79 &
$15.99$6.99 $51.11
Body tube 2.6”/2.59” out/in dia.14” height
2 tubes per pack $5.09 $0 $10.18
Body Tube 0.967”outside diameter18” height
3 tubes per pack $4.79 $5.95 $10.74
Body Tube Coupler
2.59” outside diameter 3 couplers $3.98 $0 $3.98
Shock Cord 140 lb Strength 3 feet $.25/foot $0 $0.75Shock Cord 0.5” Kevlar Tubular 2 yards $3.93/
yard$6.95 $14.82
Clip Whips Cluster Whips 2 engine clusters $13.99 $4.95 $18.94Nose Cone Polystyrene PS
9” long , 2.6” diameter1 cone $14.53 $7.60 $22.13
Recovery Wadding Recovery sheets 75 Sheets $3.19 $0 $3.19Launch Lug ¼ in. dia 1 launch lug $2.49 $5.95 $8.44
TOTAL COST
$253.63
Calculations• y1 = (-m/2k)*ln ((T-mg-kv2)/ (T-mg)) (-.38125/
(2*.00154))*ln ((65.8-3.73625-.00154(91.762))/ (65.8-3.73625)) = -123.78*ln (.792) = 28.95
• yc = (m/2k)*ln ((mg+kv2)/ (mg)) (.38125/(2*.00154))*ln(3.73625+12.94291)/(3.73625)) = 123.78*1.496) = 185.188
• ta = (tan-1(v/qa))/qb (tan-1(91.676/49.256))/.199 = 1.861/.199 = 9.353sec
• y1 + yc = total altitude 28.95+185.188 = 214.138m = 702.55 feet
Test ResultsTest Criteria How Tested Expected results Actual
Results
Safety
Check signs of unsafe damage
Rocket remains intact
Durability Check for signs of deterioration
Be ready to fly again
Parachute
Check for rips or holes
No tears, still attached
Altitude Read altimeter after each test flight
725 and 775 feet
Flight Consistency
Time each flight
Flight be between 35-55 seconds
Individual Test Results
Test Score Pass or Fail?Safety
Durability
Parachute
Altitude
Flight Consistency
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