CAMALEÃO 8700

For the construction of the final parachute we had to do research about the best type of parachute for this purpose and calculate the area that better achieves the parameters requested (flight time limited to 120 seconds and lowering speed of 8m/s and 11m/s ).

We concluded that the best type of parachute for this purpose are circular shaped because we need a parachute that gives us maximum stability for our camera to take sharp photos.

These type of parachutes have a hole at the high end in order to let out the indoor air and reduce the oscillations of the fall, needed to take a clear picture.

The area was calculated using an equation present in Cansat tips for teams 2015, that gave us the result of 7,2dm2.

Fdrag (force the can is subject to during the fall)= (1/2) x ρ (air density) x V2 x Cd (coefficient drag) x S (surface area of the parachute)

The guidelines we manufactured have 1,1 of the diameter of the respective parachute and we tied them together in a swivel. There was the necessity of testing the variables that we had (parachute with upper hole/without upper hole), for that we made 2 test-chutes. The one with the best results according to the required parameters was the parachute with an area of 7,2dm2 and with the upper hole.The tissue used is micro perforated, called Ripstop with a drag coefficient of 0,8. 

 

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