Week 8 Notes
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This 3 page Class Notes was uploaded by Austin Frownfelter on Thursday October 22, 2015. The Class Notes belongs to 0087 at University of Pittsburgh taught by Dr. Regina Schulte-Ladbeck in Summer 2015. Since its upload, it has received 14 views. For similar materials see Basics of Space Flight in Astronomy at University of Pittsburgh.
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Date Created: 10/22/15
Rocket Equation for Launch Av Avt AvW AVD Av Avt Thrust AvW Weight i AvCB steering Spin AvDDrag Av steering Steering losses AVG 39 Relative to Spin of Earth if launching eastward if westward Typical Values Avw 39 AquotW ge Tt g 1OSm2At2min120S gt AszlZkTm AVD z 1 151quot AVsteerz39ng z m z 041quot spin Example To get into orbit Av 787quot AvT 787 121quot 1 051quot 101167quot Approximately what we will need for a launch from the Kennedy Space Center to get into a low Earth orbit TVIoes of Probellants Classified by the Specific Impulse IS f similar to miles per gallon Solid Rocket Booster H N Solid fuel auntilertu tire39mrlta Errata nit I Expai un KHz3 Liquid Rocket 5 nr tnnl mnlmilrz Ham 1 mzw 39 trumpI ll 4 7 quli39id FIE Mum milgun gt to use as as oxidizing if 39 agent Differences Solid Liquid Mixture of solid fuel and oxidizer Liquid Oxygen oxidizer LOX Liquid fuels Example Petroleum Aluminum and aluminum perchlorate Cryogens liquid gases Isp2003 veZZkTm ISp400S vez l kgl Very low 1 but very simple Higher IS but more complicated Limited Control no stop once started Can stop and restart engine Valves more chance of failure Cryogens are difficult to handle mm To date all launches from Earth have used multistage rockets Two types SerialTandem Single line back stage drops off incrementally 53 51ng r1 Em EIE39E39E39E Parallel Hf I I I Center stage with stages strapped on the sides Advantage 539 a gala Drop mass as fuel is lost once burned out the tank is useless Less mass to accelerate for each stage Each stage can be designed differently Disadvantages Complexity can lead to problemsfailures Stage separation is a point of failure Launch Alternative Air launch to orbit Rocket is strapped to an airplane and is released at a certain altitude Example Stargazer aircraft and 3stage Pegasus rocket Landing General Concerns Deceleration to v O Type of body being landed on Gaseous Rocky Icy Solid Surface Atmosphere Aerobraking uses drag of the atmosphere to slow down Tremendous heat generated from air friction Heat shield Aerodynamics for descent and landing No atmosphere Needs rockets