Table of Contents

Balloon, Mark 1 - "Hello Kitty"

Mission Objectives

Launch Date

Sunday, 10/6/2013. 3:00pm EST. East Hill Plaza, Ithaca, NY.

Technology

Balloon Design

Parachute Size

I ran a MATLAB simulation and came up with these results:

   __Input:__
   Cd(Coefficient of Drag):  0.75                 = 0.75
   Parachute Diameter:       12 [in]              = 0.305 [m]
   wind speed:               22 [ft/s]            = 6.7056 [m/s]                     
   __Output:__
   vxfinal: 	               22 [ft/s]            = 6.7056 [m/s]
   vyfinal: 	               15.6022 [ft/s]       = 4.75 [m/s]
   Kinetic Energy at impact: 0.56477 [ft*lbf]     = 0.766 [J]
   Max Force:                0 [lbf] at 500 [ft]  = 0 N
   

Cornell Rocketry has light weight parachute that is 12[in] diameter.

Project weight

Element Weight
Mylar Balloon 1g
Parachute & rigging 2g
Nichrome and lead wire 5g (est)
Radio 35g (Case partially removed)
AA Batteries 37g
CR2032 Battery 3g
Microcontroller board 20g
Waterproof packaging 10g (est)
Total 113g

Electronics Design

Code Design

set_timer(1 hour);
while(true) {
  transmitter on;
  send_morse("W2CXM/BALLOON");
  send_tone(10);
  send_dead_air(10);
  transmitter off;
  sleep(30);
}

Testing

Final Cost Estimate

Element Cost
Mylar Balloon(s) & gas $15
Parachute $5
String $0
Nichrome and lead wire $6
Radio $20
Battery $20
Microcontroller board & components $20
Waterproof packaging $0
Total $86

Meetings