Hybrid Competition Propulsions Research Bringing 8 teams Six highest altitude Two 2,000 feet Meeting yesterday Sugar Motors Potential launch Updates
Static Motor Test Stand Variable motor diameter 24mm-98mm Withstand 3000 N with reasonable factor of safety Operate upwards and downwards Measure force over time (load cell) Clamp into ground.
Static Motor Data Acquisition LabVIEW VI Measure and interpret data from the load cell NI DAQ (OOTB or 6009) Needs to determine Total Impulse Average Thrust Max Thrust Thrust Curve Burn Time
Fin Mount Apparatus Apparatus to help mount fins symmetrically Multiple rockets Either 3 or 4 fins Multiple body diameters/motor mount tubes Account for changing location of centering rings
“Office Hours” MAE A 211 Monday, 9:30 AM – 12:00 PM Tuesday, 2:30 – 4:00 PM Friday, 9:30 AM – 12:00 PM
How Rockets Work Newton’s Third Law of Motion: For every action there is an equal and opposite reaction Rocket motor = energy conversion device - Matter (solid or liquid) is burned, producing hot gases. - Gases are accumulated within the combustion chamber until enough pressure builds up to force a part of them out an exhaust port (a nozzle) - Thrust is generated by a pressure buildup within the combustion chamber and by mass ejection through the nozzle. - Combustion chamber geometry, throat diameter, and nozzle geometry govern performance and efficiency (Conservation of Momentum-Fluids)
Rocketry Model Rocketry Uses motors A-G Anyone can launch Class 1 Is made of paper, wood, or breakable plastic Uses a slow burning propellant High Powered Rocketry Needs certifications Uses motor more than 160 N-seconds of total impulse Uses motor more than 80 N average thrust Exceeds 125 g of propellant Uses hybrid motor Rocket weighs more than 1500 g Includes any airframe parts of ductile metal Class 2
High Powered Rocketry Level Certifications Level 1- Uses H (320 N-seconds) or I motors (640 N-seconds) Level 2- J, K, L Level 3- M, N, O Beyond O is Class 3 and requires waivers (total impulse greater than 40,960 N-seconds) Numbers of Motor Example H64-8 H is the total impulse (between 160-320 N-s) 64 N is the average thrust 8 seconds is the delay ejection charge To determine motor burn divide total impulse by average thrust