Space Balloon - liveforum.org

Space Balloon – 999 Project
Michio Inoue
Space Online School
02/05/2011
Galaxy Express 999
Leiji Matsumoto
Earth Orbiting Satellites
 Geo-stationary orbit:
36,000km (22,000mi)
 GPS: 20,200km (12,550mi)
 ISS: 350-400km
(220-250mi)
 very expensive!
Gateway to Space
 SpaceShipOne: 100km
“edge of space”
– First commercial vehicle
to go to “space”
– $200,000/person
– Official
 Balloon: 32km (20mi)
– What
our focus today
– Reachable with <$1000
 Airplanes: 10km (6mi)
Space Balloons
 Becoming popular after 2006
 Done by students and hobbyists
–
–
–
–
–
CU Spaceflight (Cambridge University)
SABLE (Canada)
MIT undergrads
Students in Spain
etc. etc.
 Canadian group (SABLE)
 August 2007
4,700 ft
6min.
22,900 ft
30min.
76,900 ft
105min
117,597 ft (max)
140min.
Launch
t=0min.
69,700 ft.
148min.
Retrieve
45,400 ft.
157min.
7,600 ft
180min.
0 ft
186min
1,100 ft.
185min
Descent with parachute
Photo: Nikon Coolpix P2
Balloon on the Ground
 KCI 1200 – popular weather balloon
– Flaccid
Body Length:
– Average Weight:
226 cm (7.4ft)
1200 g (2.4lb)
http://www.sbszoo.com/bear/sable/sable3.htm
Balloon before Releasing
 Gross Lift:
 Payload:
 Diameter:
3440 g
1050 g
179 cm
Balloon
Parachute
Payload
 Rate of Ascent:320 m/min (12mph)
System
 Example: by UK
High Altitude Society
Images/Videos
 Cameras programmed to take pictures
at a fixed interval
 Video always on
 No live broadcast
Even Teddy Bears Went to Space!
http://www.dailymail.co.uk/sciencetech/article1091896/Out-world-British-teddy-bears-strappedhelium-weather-balloon-reach-edge-space.html
What’s it like at 32km?
Layer
Level
Name
Height
km (ft)
Base
Temperature
°C (F)
Base
Atmospheric
Pressure (Pa)
0
Troposphere
0
+15.0 (59)
101,325
1
Tropopause
11 (36,000)
−56.5 (-70)
22,632
2
Stratosphere
20 (65,000)
−56.5 (-70)
3
Stratosphere
32 (105,000)
−44.5 (-48)
868.02
4
Stratopause
47 (154,000)
−2.5 (28)
110.91
5
Mesosphere
51 (167,000)
−2.5 (28)
66.94
6
Mesosphere
71 (233,000)
−58.5 (-73)
3.96
7
Mesopause
85 (279,000)
−86.2 (-123)
0.37
5,474.9
How Does It Come Down?
 It “pops” at the bursting altitude: 33.2 km
 How big is the balloon?
– Ideal gas law:
or
–
At the ground level
 D0 = 1.76 m
 p0 = 101325 Pa
 T0 = 15 C (= 288 K)
–

At 32km
 p1 = 868 Pa
 T1 = -44 C (= 229 K)
 Diameter at Burst: 8.6 m! (28 ft)

Descent
http://nearspaceventures.com/w3Baltrak/readyget.pl
 Maximum speed:150 mph
–
Parachute slows it down
 Balloon predictor
–
Time
– Launch site
– Ascent rate
– Descent rate
 predicted GPS track
 Just an indicator
Retrieval
 The balloon travels about 20 miles horizontally
 A transmitter in the payload box transmits
its GPS location
Retrieved Data
 GPS track, temperature, pictures, movies, etc.
Mission Ideas
 Aim to launch balloons every 6 months
– 2.3
lbs payload, iPhone as a primary computer
 Science
– “Would
the cockroach survive at 30km?”
– “Boiled egg vs raw egg”
– Potato chips
– Ping-pong ball
– Wind, Temperature, GPS position
 Gliding from space (2011)
 Live images/videos (2012)
 Staying aloft (2013)
Questions?
Vulture 1
3 ft
paper
"cockpit "
Pilot
straws
http://www.theregister.co.uk/2010/11/17/vulture_cad/
http://abcnews.go.com/Technology/slideshow/paper-airplane-launched-edge-space-returns-photographs-earth-12121525
– データをとって送信するiPhone用のプログラムの
開発 ← 一番時間がかかる
– パラシュートの折りたたみ＆展開実験（ビルの屋
上から）
– 着地の際の衝撃の評価
 第２回公開実験：２０１１年秋
– 小型HDカメラの撮影映像を送信する
– パラシュートに代わる飛行体による滑空帰還
 第３回公開実験：２０１２年春
– ライブ映像送信と滑空帰還（その２）
– 高高度（地上２０キロ辺り）の滞空実験

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