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Explore rocket propulsion basics, laser propulsion systems, and solar sail technology in this informative lesson by Dr. Andrew Ketsdever. Learn about Alka Seltzer rockets and Shuttle Main Engines. Discover the science behind these propulsion methods.
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MAE 5495: Launch Vehicle AnalysisLesson 4: Introduction to Thermodynamics Dr. Andrew Ketsdever UCCS
Rockets of the Day • Laser Propulsion • Laser Pointer: 5 mW, Spot size 3-4 mm diameter • For normal incidence and r = 1 F = 33 picoNewtons Isp = ∞ (almost) • Solar Sail: P = 1358 W/m2; F/A = 9 microNewtons / m2 • Saturn V First Stage, F = 6.7 megaNewtons, Isp = 295 s
Rockets of the Day • Alka Seltzer Rocket • NaHCO3 + H2O CO2 + H2O + OH + Na (eventually) • Mprop = 0.01 kg • Vburnout = Vcrash = 0.5 g (TOF)2 = 5 m/sec • Itot = ∆p = mempty Vcrash = 0.05 kg x 5 m/s = 0.25 N-sec • F = I / tburn = 0.25 N-sec / 0.1 sec = 2.5 N • Isp = I / (Mprop go) = 2.5 sec • Shuttle Main Engines: F = 1.7 MegaNewtons, Isp = 450 sec