Parachute tests

To develop our final parachute, we had to test our prototypes. Through the launches, we wanted to achieve two goals: The first one, to time the fall from a 100m. This way, we would be able to calculate the average speed of the fall. The second one, to record the falls and analyse the more stable parachute. We tested two different plastic parachutes. This had been designed with plastic to save resources, as the final one will be done in cloth. The first parachute had an squared shape, connected to 4 points of the can’s surface, the second being hexagon-shaped, connected through six nylon ropes to six points on the can’s surface. To prep the prototypes for launch, all characteristics of it had to be identical to the final one. Using cans, the size was correct, but to achieve the perfect weight, we added some dead weight (rocks wrapped in newspaper) on the bottom of the body, reaching the 350 g’s limit.

Having no drones available for the launches, we turned to one of our sponsors, ADTS, who put at our disposal a drone to carry out the tests, and on Friday the 15th we headed out to an aeromodelism practice field. There, four launches were carried out. The squared parachute achieved an average speed of 8.4 m/s, enough to be accepted in the competition. The hexagon-shaped parachute got its six ropes tangled and didn’t open in the fall, covering a hundred meters in six seconds. That one, obviously, was discarded. The last two launches had different purposes. One consisted of a plastic bottle with a Raspberry Pi camera and a portable battery to support the Raspberry Pi. Our target was to evaluate the camera recording. The fourth launch was the squared parachute, once again, but with a hole on the top to gain some speed. It turned out to reach a speed of 9 m/s, better than the first one, and a bit more stable.

And thus, the report being heard by our parachute expert, he has started developing the final design. We appreciated and wanted to thank for all help and facilities to ADTS and the local club who owned the field, whose representatives were really nice with our team and listened eagerly to our narratives of the project. Clearly, another one or the Cansat perks!

La burgoneta team

 

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