Alabama A&M University Rocket Program CDR Presentation 2011

Overview 1.The Project Summary 2.The Launch Vehicle 3.The Scientific Payload 4.Safety and Testing 5.Rocksim Simulations 6.Budget 7.Outreach

Project Summary We plan to design, fabricate and launch a reusable rocket with scientific payloads. The scientific payload will measure the affect of altitude on the frequency response of a driver. The rocket should have a safe return with the help of the Dual Deployment Parachute system. The scientific payload should withstand the impact of landing and the data should be recoverable.

Launch Vehicle Summary Size:Length = 7.5 ft,Diameter = 6 in Motor:Aerotech 75 mm L-850W Solid Motor Flight: The rocket should attain an altitude of 5280 ft ± 400 ft. Recovery: Dual Deployment System

Changes Made Since PDR The material that is used on the launch vehicle is Magna Frame. The main parachute is a TAC-9A at 96”.

Launch Vehicle The launch vehicle is constructed of Magna Frame tubing, which has been selected over the traditional phenolic tubing due to more strength and lighter weight. A four fin design was used to decrease the amount of wind-induced spin, and to move the center of pressure toward the air frame. The launch vehicle is composed of the following five subsystems: 1. Nose-cone & Payload 2. Main Parachute Compartment 3. Recovery Bay 4. Drogue Parachute Compartment 5. Booster Section.

Parachute Housing Main Parachute Compartment Drogue Parachute

Recovery Systems Dual Deployment Attachment Scheme Typical Dual Deployment Setup

Avionics Bay & Altimeters Recovery BayPerfect Flite Altimeter

Dual Deployment Avionics Test With the altimeter armed, pull and release the balloon for barometric pressure. The LEDs lights should activate which signals from altimeter indicating no barometric pressure. Consists of balloon, cup, altimeter, LED lights, and 9V battery.

Spectrum Parachute Sizes We are estimating that the weight of the rocket will be between 20-25lbs. The size of the parachute will be based on the weight and a desired descent speed 17-22ft/s. The main parachute is a GLR Tac 9A parachute. The website info central has a descent rate calculator for determining the needed size. We can also change the chute sizes in Rocksim and verify the descent rate. The main parachute compartment will contain a parachute in the range of 24 to 30 inches. The drogue parachute compartment contains a 24 inch Tac 9 parachute.

Ejection Charge Calculations An ejection force of 10 psi. has been selected for ground testing. The Ideal Gas Law: PV = nRT The Ejection Force (lb) : F= P*πr 2 Where, P is the chamber pressure, psi, and r is the radius, in. Black Powder (BP) Calculations C * D 2 * L = grams of BP Where: C is a constant that is determined based on the pressure D is the airframe diameter L is the length of the body tube to be pressurized 3.5 grams of black powder will be needed for Main and about 2 grams for the drogue compartment. The back-up charges are increased by one gram for flight

Safety & Enviroment

Payload Summary Measures frequency response vs. altitude Portable Mp3 Player Powerful 15w amplifier Full range driver Omnidirectional Measurement Microphone PreAmp with Phantom Power Custom battery pack Rocket Data-Acquisition System (R-DAS) Insulated ABS Container

Payload Summary

Payload Operation Pink noise used as reference signal Amplifier provides power to driver Microphone records driver response R-DAS stored microphone data digitally Driver response will be affected by air load on cone.

Payload Electronics Battery Pack v 3600mAh batteries wired in series Driver Peerless 3” Full range driver Microphone Dayton EMM-6 Omnidirectional Measurement Microphone Pre Amplifier MXL MicMate Signal Source SanDisk Sansa Clip 1GB Amplification Sure TA2024 Class D Amplifier Transformer Automotive USB charger, adapted for payload usage Data Storage Rocket Data Acquisition System (R-DAS)

Payload Safety & Verification Preliminary analysis of Failure Modes FunctionPotential Failure ModePotential Effects of FailureFailure Prevention 1Battery Pack MalfunctionDevices will not be powered. A short may cause fire or explosion Positive wire will be fused. Devices will be checked for power. 2Driver, amplifier, signal source, microphone, preamp malfunction No or incorrect data will be obtain Insure Proper Setup and operation, Check power supply 3R-DAS Malfunction Will not record dataCheck power and settings.

Rocksim Forecasting

Budgeting ComponentsCostDistributor Structures & Launch System $ 2,400 Giant Leap Aerotech Tools$ 350Home Depot, Lowes Travel$ 500 Electronics $500 Madisound, Amazon, parts- express Activities/Outreach $ 200 Paint & Body$ 150 Total$ 4,100

Outreach Summary Boys & Girls Clubs of Madison County School of Engineering and Technology Awareness Day Alabama A&M University - Science Technology Engineering & Mathematics (STEM) Day Alabama A&M University NASA High School Senior Day:

Questions?????