The  Black  Fox 3 rd  Year High Powered Rocket Project: Propulsion System Construction
Aims and Objectives <ul><li>Aim:   To choose a motor for incorporating into a high powered rocket and take it to a predete...
Design Team’s Choice <ul><li>AeroTech J90W </li></ul><ul><ul><li>Solid rocket motor </li></ul></ul><ul><ul><li>Loses Veloc...
Limitations on Motor Choice <ul><li>Solid motor unavailable as not C.E. Certified </li></ul><ul><li>We should feel free to...
Motors We Tested <ul><li>The standard J class HyperTEK motor kit (NB: we only need one grain) </li></ul><ul><ul><li>I260 w...
Final Motor Choice <ul><li>We finally went with the J250 </li></ul><ul><li>We kept finding the overall rocket weight was g...
J250 Thrust Curve The thrust curve is still quite smooth despite it’s short burn time J250 thrust curve J115 thrust curve
Motor Mount Research Insertion of motor mount into the airframe and fitting of bolts   Thrust ring and centring (left), th...
Fin Can <ul><li>A Fin Can is a motor mount that also includes mounting points for the fins of a rocket </li></ul><ul><li>U...
Motor Mount Design
The Final Product The motor mount being assembled (left) and fully assembled (right) The final design fitted to the HyperT...
Fitting the Motor Mount <ul><li>The motor mount fitted inside  </li></ul><ul><li>the airframe </li></ul><ul><li>The retent...
Coordinating Role <ul><li>After the motor mount was made I decided to help with the organisation of the project </li></ul>...
The Running Order   (a)     (b)   (c) <ul><li>The rocket before parachute is loaded </li></ul><ul><li>Locating the injecto...
The Running Order (a)  (b) <ul><li>Locating the fuel grain over fill stem </li></ul><ul><li>Fitting of break wire </li></u...
Prepping the HyperTEK (a)  (b)  (c) <ul><li>Tape the pre cut ignition wire to fill stem </li></ul><ul><li>Slide the motor ...
The Launch
The Launch
The Landing
Crash Analysis The recovered rocket <ul><li>The R-DAS flight computer was completely  destroyed, as was the GPS </li></ul>...
Results <ul><li>As there was no down-link established, no data was recorded </li></ul><ul><li>The GPS was destroyed so we ...
What Went Wrong? Apart from speculation on the day, I did some detective work on the internet regarding the software after...
Conclusions <ul><li>The mission was an overall failure </li></ul><ul><li>But we seem to have reached an altitude predicted...
Questions?
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The Black Fox Presentation

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My presentation for a group Physics BSc project to launch an amateur rocket with scientific payload.

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The Black Fox Presentation

  1. 1. The Black Fox 3 rd Year High Powered Rocket Project: Propulsion System Construction
  2. 2. Aims and Objectives <ul><li>Aim: To choose a motor for incorporating into a high powered rocket and take it to a predetermined height </li></ul><ul><li>The objectives of the project were: </li></ul><ul><ul><li>To choose between Solid and Hybrid propulsion </li></ul></ul><ul><ul><li>Use a flight spreadsheet provided by the propulsion design team to predict altitude, flight time etc. </li></ul></ul><ul><ul><li>Purchase the motor </li></ul></ul><ul><ul><li>Fit the motor into the airframe using a purpose made motor mount </li></ul></ul><ul><ul><li>Launch safely </li></ul></ul><ul><ul><li>Recover data and cross reference with initial predictions </li></ul></ul>
  3. 3. Design Team’s Choice <ul><li>AeroTech J90W </li></ul><ul><ul><li>Solid rocket motor </li></ul></ul><ul><ul><li>Loses Velocity before burnout </li></ul></ul><ul><ul><li>Reaches lower Altitude and velocity </li></ul></ul><ul><ul><li>Longer Burn time </li></ul></ul><ul><ul><li>Smoother thrust </li></ul></ul><ul><li>HyperTEK I310 </li></ul><ul><ul><li>Hybrid rocket motor </li></ul></ul><ul><ul><li>Less velocity loss close to burnout </li></ul></ul><ul><ul><li>Thrust more constant through flight </li></ul></ul><ul><ul><li>Higher Velocity and Altitude reached </li></ul></ul><ul><ul><li>Greater force exerted on the rocket </li></ul></ul>
  4. 4. Limitations on Motor Choice <ul><li>Solid motor unavailable as not C.E. Certified </li></ul><ul><li>We should feel free to choose anything </li></ul><ul><li>Increases in overall rocket weight </li></ul><ul><li>Maximum altitude of 8000ft (2440m) set by UKRA </li></ul><ul><li>No Supersonic flight </li></ul>
  5. 5. Motors We Tested <ul><li>The standard J class HyperTEK motor kit (NB: we only need one grain) </li></ul><ul><ul><li>I260 with .172” orifice </li></ul></ul><ul><ul><li>J115 with .076” orifice  </li></ul></ul><ul><ul><li>J170 with .098” orifice  </li></ul></ul><ul><ul><li>J250 with .125” orifice </li></ul></ul><ul><li>There is also another fuel grain called a HyEFX: </li></ul><ul><ul><li>More exotic chemicals and materials go into making it </li></ul></ul><ul><ul><li>Produces lots of white smoke and flame </li></ul></ul><ul><ul><li>Slightly greater thrust produced </li></ul></ul><ul><ul><li>We couldn’t use one as it requires specific equipment that was unavailable </li></ul></ul>
  6. 6. Final Motor Choice <ul><li>We finally went with the J250 </li></ul><ul><li>We kept finding the overall rocket weight was going up </li></ul>648.4053 101.0944 Altitude (m) Velocity (m/s) Max Values
  7. 7. J250 Thrust Curve The thrust curve is still quite smooth despite it’s short burn time J250 thrust curve J115 thrust curve
  8. 8. Motor Mount Research Insertion of motor mount into the airframe and fitting of bolts Thrust ring and centring (left), thrust ring fitted (middle) and its clamping mechanism (right)
  9. 9. Fin Can <ul><li>A Fin Can is a motor mount that also includes mounting points for the fins of a rocket </li></ul><ul><li>Unfortunately we could not use this design </li></ul><ul><li>Although a new design developed by the airframe team made me more confident </li></ul>
  10. 10. Motor Mount Design
  11. 11. The Final Product The motor mount being assembled (left) and fully assembled (right) The final design fitted to the HyperTEK with centring on oxidizer tank
  12. 12. Fitting the Motor Mount <ul><li>The motor mount fitted inside </li></ul><ul><li>the airframe </li></ul><ul><li>The retention plate screwed </li></ul><ul><li>in to hold the motor in </li></ul>
  13. 13. Coordinating Role <ul><li>After the motor mount was made I decided to help with the organisation of the project </li></ul><ul><li>This involved: </li></ul><ul><ul><li>Preparing the teams for the weekly meetings with supervisors </li></ul></ul><ul><ul><li>Put together a launch-day schedule </li></ul></ul><ul><ul><li>Compiled safety documentation </li></ul></ul>
  14. 14. The Running Order (a) (b) (c) <ul><li>The rocket before parachute is loaded </li></ul><ul><li>Locating the injector valve </li></ul><ul><li>Fitting vent tube </li></ul>
  15. 15. The Running Order (a) (b) <ul><li>Locating the fuel grain over fill stem </li></ul><ul><li>Fitting of break wire </li></ul>Sliding the rocket onto the launch rail
  16. 16. Prepping the HyperTEK (a) (b) (c) <ul><li>Tape the pre cut ignition wire to fill stem </li></ul><ul><li>Slide the motor onto stem until properly seated </li></ul><ul><li>Using tie-straps to ensure tight fit and stop premature launch </li></ul>
  17. 17. The Launch
  18. 18. The Launch
  19. 19. The Landing
  20. 20. Crash Analysis The recovered rocket <ul><li>The R-DAS flight computer was completely destroyed, as was the GPS </li></ul><ul><li>No data could be recovered </li></ul>
  21. 21. Results <ul><li>As there was no down-link established, no data was recorded </li></ul><ul><li>The GPS was destroyed so we had no idea what height it reached </li></ul><ul><li>However, using video footage and editing software we could find out how long it took to go up – then try and calculate an altitude </li></ul>We used Newton’s laws to roughly calculate height Error = 0.606%   h max = 644.4768 m h max = 648.4053 m v av = 50.5472 m/s v max = 101.0944 m/s v max = same as predicted t total = 24 s t total = 25.5s Predicted Flight Actual flight
  22. 22. What Went Wrong? Apart from speculation on the day, I did some detective work on the internet regarding the software afterwards We launched on 06/03/2005, so we were probably running V3.6
  23. 23. Conclusions <ul><li>The mission was an overall failure </li></ul><ul><li>But we seem to have reached an altitude predicted </li></ul><ul><li>Future Improvements: </li></ul><ul><ul><li>Never to go ahead when your not 100% sure </li></ul></ul><ul><ul><li>Starting the project knowing there HAS to be a mission coordinator </li></ul></ul><ul><ul><li>Always investigate every possible angle to avoid disappointment </li></ul></ul>
  24. 24. Questions?

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