Documents have been converted to zip files for faster downloads. You will need WinZip or similar to unpack them. Alternatively you can view them as HTML files in your browser.

For free zip software and much more try Freebyte. They have a number of CAD programs that you may find useful if you like experimenting.

Drawings can be opened and modified using AutoCad or similar. The free download for TurboCad is no longer available.

Pippin 2000 - a hand launched outdoor glider

Plan - zipped .dxf file (requires a CAD program to view)

Construction article - zipped Word file
Construction file - HTML file, will open in your browser