Hi Dave,

It is from Australia. I have a link to it on my Soaring-Links Theory,
Equations & Spreadsheets page he
http://www.soarmn.com/soaring_links/theory.htm

Good Soaring,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

"Mr David Donald" wrote in message
...
Some years ago, I was able to download an excel spreadsheet that
compared two gliders (via drop down boxes). It displayed their polars
in different colours against each other. It also showed their sink
rates at speed.

My computer has crashed and I'm trying to find a copy. Anyone got
one out there?

Dave.