Thanks, Scio, but it is not clear from that 'short' PDF whether a TOW is required before an RTOW can be determined, which is not logical. Denti's 'default' structural + 'xx' and max thrust rating seems to be one solution - or simply a manual high TOW entry.. The system described by N1 and tfs would appear to be suitable for a 'comfortable' scheduled op, with CLC etc, but not suited to N1 who for some reason "wanna calculate my useful load" although I feel if he/she did actually understand what RTOW is the answer to post #1 would have been obvious
Are there any other links to usage of the OPT? I would appreciate an insight as my last airline muttered and mumbled about using it but never did before it went bust.
Like a few others, I still vote for care-worn perf sheets and a space at the bottom of the PLOG. At least you know what you are doing.