Ron Jensen 2011-12-11$Revision: 1.3 $ Models a 6-foot weather balloon.
This model was created using publicly available data, publicly available
technical reports, textbooks, and guesses. It contains no proprietary or
restricted data. It has been validated only to the extent that it seems
to "fly right", and possibly to comply to published, publicly known,
performance data (maximum speed, endurance, etc.). Thus, this model
is meant for educational and entertainment purposes only.
This simulation model is not endorsed by the manufacturer.
This model is not to be sold.
References
[1] BT-1039.12 http://library.gsfc.nasa.gov/Databases/Balloon/Data/BT1039.12.pdf
Some Theoretical and Practical Aspects of Sounding Balloon Velocity
Dewey and Alrny
Andrew J. Kelly
Jun 1968
[2] http://www.novalynx.com/400-balloons.html
Model Weight Uninflated Diameter Std Inflated Diameter Burst Diameter
gm in (mm) ft (cm) ft (cm)
400-8242 800 42.5 (108) 6.1 (185) 22.3 (680)
Balloon Weight Free Lift Payload Gross Lift Inflation Volume Inflation Diameter Ascent Rate Altitude at Burst
gm gm gm gm ft3 (m3) ft (m) m/min mi (km)
800 2000 1150 3950 127.4 (3.6) 6.2 (1.9) 400 17.4 (28)
[3] http://ntrs.nasa.gov/search.jsp?R=19640016055 Aerodynamics of spherical balloon wind sensors
9.8 6.2 0.0 6.2 0 0 0 0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Inertia varies between 0.35 and 4.5 slug*ft2 as radius increases from 3.1 ft to 11.1 ft 1.0 1.0 1.0 0.8 0.0 0.0 0.0 1.15 0.0 0.0 -25.1 0.0 0.0 0.0 1.00 1.00 10.00 10.00
buoyant_forces/gas-cell/volume-ft3 ge buoyant_forces/gas-cell/max_volume-ft3
buoyant_forces/gas-cell/burst ge 0.5
inertia/weight-lbsforces/fbz-buoyancy-lbs0.1.
fcs/parachute_reef_pos_norm
8.0 Radiosonde is tied to the bottom of the balloon1.0metrics/radius-ft-12Radius of balloon0.23873241buoyant_forces/gas-cell/volume-ft30.33333Diameter of balloon2.0metrics/radius-ftProfile area of balloonmetrics/radius-ftmetrics/radius-ft3.14159surface area of balloonmetrics/radius-ftmetrics/radius-ft3.141594.0Reynold Number Corrected to balloon Diameteraero/Remetrics/diameter-ftmetrics/cbarw-ftDrag. Table from [1] 1.22 aero/qbar-psfmetrics/Sref-sqft