NDLI: Balloon for long-duration, high-altitude flight at venus

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Balloon for long-duration, high-altitude flight at venus

Content Provider	NASA Technical Reports Server (NTRS)
Author	Fairbrother, Debora Fredrickson, Thad Hall, Jeffrey Said, Magdi Yavrouian, Andre Sandy, Chuck Kerzhanovich, Viktor
Copyright Year	2007
Description	A document describes a 5.5-m-diameter, helium-filled balloon designed for carrying a scientific payload having a mass of 44 kg for at least six days at an altitude of about 55 km in the atmosphere of Venus. The requirement for floating at nearly constant altitude dictates the choice of a mass-efficient spherical super-pressure balloon that tracks a constant atmospheric density. Therefore, the balloon is of a conventional spherical super-pressure type, except that it is made of materials chosen to minimize solar radiant heating and withstand the corrosive sulfuric acid aerosol of the Venusian atmosphere. The shell consists of 16 gores of a multilayer composite material. The outer layer, made of polytetrafluoroethylene, protects against sulfuric acid aerosol. Next is an aluminum layer that reflects sunlight to minimize heating, followed by an aluminized polyethylene terephthalate layer that resists permeation by helium, followed by an aromatic polyester fabric that imparts strength to withstand deployment forces and steady super-pressure. A polyurethane coat on the inner surface of the fabric facilitates sealing at gore-to-gore seams. End fittings and seals, and a tether connecting the end fittings to a gondola, are all made of sulfuric-acid-resistant materials.
File Size	116272
Page Count	1
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20090041268
Archival Resource Key	ark:/13960/t9x112s10
Language	English
Publisher Date	2007-04-01
Access Restriction	Open
Subject Keyword	Man/system Technology And Life Support Polyurethane Resins High Altitude Venus Atmosphere Composite Materials Polyesters Gondolas Permeating Balloon Flight Long Duration Space Flight Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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