Rocket Propulsion Ft = mv So: F = engine thrust

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Presentation transcript:

Rocket Propulsion Ft = mv So: F = engine thrust  t = time to burn fuel m = mass of fuel burned v = exhaust gas velocity Ft = mv

Which Rocket Accelerates faster? B Demo – F14

Rocket Propulsion Example 1: A rocket burns fuel at a rate of 1.2 kg/s, with an exhaust velocity of 1250 m/s. What thrust does it develop? (1500 N)

Rocket Propulsion Example 2: A model rocket engine develops 12.0 N of thrust with an exhaust velocity of 718 m/s. What is its fuel burn rate? What is the rocket’s initial acceleration if it has a mass of 238 g? (0.0167 kg/s, 40.6 m/s/s)

A certain rocket engine burns A certain rocket engine burns .0352 kg of fuel per second with an exhaust velocity of 725 m/s. What thrust does it generate? 25.5 N

The Saturn V’s first stage engines generated 33. 82 MN of thrust (33 The Saturn V’s first stage engines generated 33.82 MN of thrust (33.82 x 106 N) with an exhaust velocity of 2254.7 m/s. What was its fuel burn rate? 15,000 kg/s

A D12 engine generates 11. 80 N of thrust burning fuel at a rate of A D12 engine generates 11.80 N of thrust burning fuel at a rate of .0143 kg/s. What is the exhaust velocity? If the rocket has a mass of 139 grams, what is the initial upward acceleration? 825. m/s, 75.1 m/s/s

Rocket Propulsion Solid Fuel Engine: © Microsoft Encarta

Rocket Propulsion Thrust of the Engine: F = mv t Solid Fuel Engine: Big v means big F Big v also means lots of pressure Danger Will Robinson! © Microsoft Encarta

© Estes

m = .5 kg, Ft = 20 Ns Ft = m v 20 Ns = .5kg v Lookout! m = .5 kg, Ft = 20 Ns Ft = m v 20 Ns = .5kg v v = ? (x 2.237 for mph) © Estes

Rocket Propulsion Liquid Fuel Engine: How do you keep it from tipping? Why the “steam” coming off? © Microsoft Encarta

Saturn V Rocket - Apollo missions Escape Tower Command Module L.E.M Third stage Second stage First stage Saturn V Animation (Flash in IE)

Ion Propulsion systems Low thrust/high Δv 20-50 km/s exhaust velocity Dawn

Gridded Xenon ion drive (Like Dawn has) where’s the power come from? Gridded Xenon ion drive (Like Dawn has)

How what is the “burn” rate for this engine? (2.6E-06 kg/s) The Dawn spacecraft has a mass of about 770 kg, and an ion drive with an exhaust velocity of 35,000 m/s that generates about 92 millinewtons of thrust. (.092 N) How what is the “burn” rate for this engine? (2.6E-06 kg/s) How big a change in velocity can 50 kg of fuel give the spacecraft? The final mass will be 770 – 50 = 720 kg, on the average the spacecraft will have a mass of 745 kg (2350 m/s)