Gore Calculation Spreadsheets
is an implementation of the calulations made by Smalley for designing gores.
Steve Griffin has a
modified version that uses metric values.
Slides from Talks
Oshkosh 2008 - Note, this is a 36 megabyte PDF file -- there are lots of pictures. These slides are from a talk given
by Dan Nachbar at the EAA AirVenture Forum in Oshkosh on August 1, 2008 on building a hot air balloon. The first half of the talk gives an overview of the wide variety of homebuilt design options to consider. The second half gives a broad strokes picture of
the steps involved in doing a first project. The file does not include
two video clips that can be found at
Mike Collier's website.
The information below may be of interest to folks who want to dig
deeper into the science and technology behind LTA design. It is certainly
not necessary to do this sort of reading in order to build an aircraft.
Also, be sure to check the LINKS page for a pointers to
many other websites with useful experimental LTA inormation.
Classic Technical Works
Airship Design by Charles P. Burgess was originally
published in 1927 yet remains one of the fundemental
works in the field. The freely-available version here is provided
courtesy of the good folks at Archivale. See their
an excellent collection of LTA-related documents.
here to download the 11 megabyte PDF file.
The Scientific Ballooning Handbook is a very useful work
published by NOAA/NCAR. While focused primarily on
high altitude helium designs, this treasure trove contains
some top-notch, highly detailed technical analysis of
the design of balloon envelopes. The average home-builder
doesn't need to refer to this work. However, folks who
really like to delve into the details of design and engineering
will find lots of good stuff here. This books is a product of
the US Government and as such is in the public domain.
Each of these two PDF files is over about a megabyte in size.
Part 1 - This part is of particular interest as it contains the a paper by Justing H. Smalley describing the calculations used in the well known "Smalley Spreadsheet"