Modifications

Sauter à la navigation Sauter à la recherche
851 octets ajoutés ,  3 novembre 2018 à 23:07
Ligne 2 : Ligne 2 :     
== Introduction ==
 
== Introduction ==
The CanSat use a to slow it down when getting back to the earth. Otherwise the CanSat would crash!
+
The CanSat use a parachute to slow it down when getting back to the earth. Otherwise the CanSat would crash!
   −
The parachute is also used to maintain the CanSat in the proper position to properly orientate the antenna!
+
The parachute is also used to maintain the CanSat in the proper position to properly orientate the antenna! This is essential to receive telemetry data.
    
The [https://www.narom.no NAROM site in Norway] did publish "The CanSat Book" containing lot of useful information.
 
The [https://www.narom.no NAROM site in Norway] did publish "The CanSat Book" containing lot of useful information.
Ligne 10 : Ligne 10 :  
The most interesting parts concerns [https://www.narom.no/undervisningsressurser/the-cansat-book/the-primary-mission/parachute-design/ the Parachute Design].
 
The most interesting parts concerns [https://www.narom.no/undervisningsressurser/the-cansat-book/the-primary-mission/parachute-design/ the Parachute Design].
    +
== Parachute opening & tenseness ==
 +
The process of parachute opening and air flow capturing is a violent process. The tenseness on the fabric, wire, hook may be really impressive at the opening.
 +
 +
So you need to select strong fibres and realise strong assemblies. The ideal materials are those used for human parachute (Nylon Cord, [https://en.wikipedia.org/wiki/Ripstop Ripstop Nylon]).
 +
 +
== Fundamentals parameters ==
 +
The followings parameters are primary values to use when designing the CanSat's parachute.
 +
 +
* '''Mass''' : between 300gr and 350gr.
 +
* '''Velocity''' : between 8 m/s and 11 m/s (about 29 Km/H and 40 Km/H).
 +
* '''Drag Coefficient''' : the [https://en.wikipedia.org/wiki/Drag_coefficient drag coefficient] depends on the parachute shape and the fluid used (''Air'' in this case).
    
== Resources ==
 
== Resources ==
30 894

modifications

Menu de navigation