TARCkan Nasir AlmasriAudrey KellyKari Schulz

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

Research

•TARC handbook•Manufactures •RockSim

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

Final Design

RockSim Design

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

Bill of Materials

•Items free of expense▫Packing peanuts▫Launch pad▫Go-box

Design Proposal: CAD

Prototype

RockSim Testing

•Original design▫Two fins ▫D12-5 engine

•749.94 feet•41.595 second flight

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

Refine Design

•3 fins vs. 2▫Stability

•More room in body tube▫Egg▫Parachute

Final Solution

•Height•Weight

To Conclude