1. Rocket Propulsion Contents: Review Types of Rockets New concept 1 Example 1 Whiteboards 1,2,3Whiteboards123 Concept 2, Example 2Concept 2Example 2 Whiteboards: 1,2,3,4,5,6,7,8,9,10Whiteboards:12345678910 Saturn V Apollo stuff © Microsoft Encarta

2. So far we have: p = mv  p = m  v Impulse =  p = F  t And finally, (m)(  v) = (F )(  t) Rocket Propulsion

3. FtFt = mvmv So: F = engine thrust  t = time to burn fuel m = mass of fuel burned  v = exhaust gas velocity

4. Which Rocket Accelerates faster? A B

7. Rocket Propulsion OK – So let’s learn to be rocket scientists

8. Rocket Propulsion © Microsoft Encarta Solid Fuel Engine:

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

10. © Estes

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

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

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

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