Thanks JT, that helps a lot.
The scant info contained in some very old company documentation gave simply the following statement:
Balanced Field Length - The Condition Where V1 Is Selected To Make The TODR Equal To ASDR
It Allows Maximum Performance Benefit To be Gained From any Clearway Associated With the Runway
On thinking about this definition I believe it's wrong, and it leaves a lot to be explained anyhow. Do you agree with the statement?