HI Bloggers,
We had our 5th session but really it was the second session of aerodynamics. Today we were testing our rockets. By testing I mean Colm showed how to make sure our rockets are stable. Once we were back in our classes we went through the steps and then started. For step 1 we found out what the centre of mass is. We did this by getting a long piece of string and we did a loop around the bottle. Then we made a knot, one person would hold the string and the other person would try to put the piece of string in the middle. When you do that then your bottle will have to balance. If it does balance then just make a line which is for the centre of mass or COP. We sellotaped the string on the bottle and then moved on. Once we did step one we moved onto step two: Finding the centre of pressure. We got cardboard and made a stencil of our bottle. We then cut it out and used a ruler to find the centre of pressure. The ruler was straight and then we put the cardboard stencil over it. We tried to balance the stencil on the ruler. Once it was balanced we drew a small line there. We also put a line on the bottle at the exact same place as the one on the stencil. Step 3 was easy because it was only a stability test. You hold the string and try to make the bottle move in a circle. If it does then it is stable. If it doesn't then it is not stable. You will have to make changes if it is not stable.
Well now I can show you the pictures:
No comments:
Post a Comment