No BOAC, it was nothing that you said, but actually one of alexban's where he quoted "The assumed 50C guarantees you'll stop for a TOW of 53T if you use the V1 for 53T.If you're lighter than 53T shouldn't you use corresponding v1?". My discomfort arose from the possible hint within the statement that the lower V1 might be used with the higher Vr/V2.
Quite possibly he was not inferring this, but I wanted to jump on it before someone thought it was a good idea. (See other forums, some have).
The background to some of the differences between Mutt's and my own company's approach is that, as Mutt has indicated on other occasions, his company does not take credit for Stopway and/or Clearway, and directly use the Balanced Field speeds for the actual weight directly from the FMC. We, however, do take credit for Stopway / Clearway, i.e. a non-balanced field which is not acommodated in the FMC, and consequently obtain this V-speed data from the Airport Analysis. For unbalanced field operations, the Airport Analysis is the only PRACTICAL source of data.
Regards,
Old Smokey