Fools Journey Justin Silva Project Lead RIT Launch Initiative Rocket Requirements Cesaroni 6 Grain XL Motor Casing NAR Level 2 COTS Motor Minimum altitude of 5000 ft Minimum factor of safety of 30 ID: 767088
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Fool’s Journey Justin Silva, Project Lead RIT Launch Initiative
Rocket RequirementsCesaroni 6 Grain XL Motor CasingNAR Level 2COTS MotorMinimum altitude of 5000 ftMinimum factor of safety of 3.0Minimum stability of 2.5
SpecificationsMax Altitude: 8872ftMass: 237 oz = 14.8 lbmMax Speed: 993 ft/s (Mach 0.90)Max Acceleration: 739 ft/s^2Ground Hit Speed: 19.5 ft/s
Design OverviewFool’s Journey is an 8-foot-tall National Association of Rocketry Level 2 high-powered rocketThe rocket body is broken into two main sections and is made entirely from blue tubeThe lower section of the rocket contains three subsections, which are the booster, camera bay and avionics bayThe payload is a Nikon KeyMission 360-degree camera that will be deployed at apogee with its own parachute, with the goal of capturing breathtaking footage of the Upstate New York Landscape
OpenRocket model
Thrust plate calculations FS = Factor of safety τ = Shear stress τ Epoxy, All. = Allowable shear stress on epoxy τ Plate, All. = Allowable shear stress on thrust plate F = Force t = Force plate thickness d Inner = Diameter of thrust plate hole Parameter Allowable Value Factor of Safety Calculated Value Chosen Dimension Thrust force N/A N/A 1590 lb f N/A Force plate thickness N/A N/A 0.008 inch 0.0625 inch Shear stress on force plate 30 ksi 28 1.07 ksi N/A Shear stress on epoxy 3.80 ksi 1.99 1.91 ksi N/A
Fin Flutter Calculations C = Root chord c= Tip chord b = Fin span h = Altitude of max rocket velocity t = Fin thickness S = Fin area AR = Fin area ratio T = Temperature at max velocity ( °F) P = Air pressure at max velocity a = Speed of sound at max velocity v = Fin flutter velocity at max rocket velocity Parameter Value Fin thickness, t 0.125 inch Root chord, C 5.000 inches Tip chord, c 1.500 inches Fin span, b 2.500 inches Altitude of max rocket velocity, h 2500 feet Max rocket velocity 982 feet/sec (Mach 0.89) Fin flutter velocity 1372 feet/sec
Parachute Descent Rates F D = Drag force Cd = Drag coefficient m = Camera mass ρ = Air density A = Parachute area v = Terminal velocity of camera Parameter Value Drag coefficient, C d 1.75 Camera mass, m6.98 oz = 0.436 lbmAcceleration due to gravity, g 32.2 feet/sec 2 Air density, ρ 0.0749 lb m/foot3 Touchdown speed of camera 8.44 feet/sec Parameter Target Value OpenRocket Value Drogue deployment altitude N/A 8872 feet Main deployment altitude N/A 1000 feet Drogue descent rate 35-55 feet/sec 52 feet/sec Main descent rate 10-20 feet/sec 19 feet/sec
Drogue Chute Deployment
Main Separation Deployment
CAD Model