CDR

Clear Lake's Team Rocket2929 Bay Area Blvd.Houston, TX 77059

Design and Simulation Overview

Margin- 4.48    CG- 49.6"    CP- 67.6" Weight- 248 ozLength- 7' 1.75" Max Height- 5492 ft

Motor Selection

Opted to change the engine to a K500 to add more velocity at rail exit, but has less burn time as a result.

Thrust to Weight Motor Selction

A Cessaroni K500RL has an average thrust of 498.2 Newtons. The weight of the entire rocket is 15.5 pounds which converts to 68.95 Newtons.

So the ratio of thrust to weight is 498.2 Newtons/ 68.95 Newtons = 7.23.

Thrust to Weight ratio = 7.23

Rail Exit Velocity

A Cessaroni K500RL provides a stable take off with a 60.3312 ft/s exit velocity off of a 8' launch rail.

Scale Model

Full-Size Model

Scale Model Flight Test

Height with Ducted Nose Cone- 644 feetHeight with Regular Nose Cone- 576 feet Values Kept Constant/Scaled- Distances of CG and CP from nose scaled by 1/3Length scaled by 1/3Thrust/Weight ratio kept constant  

Recovery SubsystemDual-Deployment System• The parachute Team Rocket chose should have an optimal

size around 100 inches in diameter with a 12 inch spill hole; this was found by using the equation: 

Diameter in inches = sqrt( rocket weight in pounds * 0.454 ) * 39.6. The descent rate is approximately 16.9 ft/s.  • The drogue chute has an 18 inch diameter with a 3.5 inch spill

hole and an approximate descent rate of 96.5 ft/s.

The independent redundant altimeters will control the ejection charges.  Each altimeter will control two of the four ejection charges per chute compartment.  Since they will be able to provide 1 Amp of current they are capable of setting off the electric matches.  Each altimeter uses a 9 V battery giving it long pad stay time.  Each has an audible continuity check.

Recovery SubsystemEjection Charges • .77 grams of black powder required for drogue chute• 2.3 grams of black powder required for main chute

o Each will be doubled and separated into 4 parts so each altimeter can individually deploy the recovery system.

• The Missleworks altimeter delay function will prevent over-pressurization.

GPS Tracking

For the tracking system the team will be using an Altus Metrum Telemetrum tracker.  It will broadcast data at a frequency of 434.550-435.550 Mhz.  The team's sponsor and one of the team's mentors both have HAM radio licenses meaning the team has the capability of tracking the rocket.

PayloadPayload measures the difference in temperature between two outputs of the vortex tube. Nose cone will have an air duct. Copper tube inside the nose cone will funnel that air to vortex tube. Exair Model 3202 vortex tube. J IRCO - 001 microtemp thermocouples.

SafetyPersonnel Hazards and Hazard Mitigation: • Improper instructions or care of

the rocket may cause future harm to team members or items around the rocket

• Precautions at the time of the launch include standing a fair distance of at least 200 feet, waiting for the rocket to land before going to retrieve it, and to make sure that all required conditions are safe for the rocket to be launched.  

Failure Modes: • We will use two different

altimeters for redundancy, minimizing the risk of failure of the recovery system.

• There will also be two parachutes, (the Drogue Chute and the Main Chute) if the Drogue chute fails to deploy then the rocket would fall significantly faster until the deployment of the Main chute.

 

SafetyLaunch Risks:  • Ejection charges or motor

might fail and cause the rocket to go ballistic, which could cause injury or property damage

 

Environmental Concerns: • Rocket engine could explode

and cause a fire on dry grass.• A rocket with a motor

improperly assembled could cause an explosion, starting a fire, and injuring people around the launch site.

• Missing rockets that are lost after launch or fly too far could land and start fires.

All NAR and TRA safety rules, SLI guidelines, and the directions of the RSO will be followed. 

Launch Concerns andOperation Procedures

Rocket Assembly

1. Check on board circuitry for continuity.

– Pack parachutes and shock cords.– Set up GPS and establish contact

with radio receivers.– Join the body tube sections.– Assemble motor.– Attach motor to rocket.

Launch Procedure

1. Lubricate the launch rail.– Load the rocket on the rail.– Check GPS system for

transmission to receiver.– Check altimeters for audible

continuity to ensure ejection charge functionality.

– Attach the igniter to the motor.– Check for igniter continuity.– Clear the surrounding 75 feet of

objects and 200 feet of people.– Get clearance from the RSO.– Give a 5 second countdown before

igniting the igniter.

 

Notes

1-minute waiting period after igniter failure

75 ft radius of objects clear200 ft radius of people clear

Post Flight Checks

• Payload ventilation• Surface damage that may

cause payload to fail• Damage that might impair

rocket flight• Continuity of electronics on

board

BUDGET:Project Budget  Travel Budget

Rocket Parts:  Airfare (15 people) $7430

Body Tube $300  Hotel Stay:

Nose Cone/ Tail Cone $100 Total Hotel Cost (4 nights) + tax

$2030

Fins $35

Altimeters $220 Meals:

Payload Equipment (Electronics and Vortex Generator)

$300 Cost Per Day (15 people, $20 per person)

$300

Tools (donated) $0 Total Meals (5 Days) $1500

Parachutes $150Motor $200

Altus Metrum Telemetrum (GPS) $400

Other Expenses:

Outreach Project $50Shipping for Rocket Parts $200

Epoxy $50Sandpaper $40

Miscellaneous Expenses $150TOTAL: $2,265 TOTAL $10,960