I last flew the Tens (Standard, but with droop-snoot wing-tips to enable FL430) in '74 and manuals not with me at the moment as am on 'oliday.
Think the slight discrepancy between the figures of Tonks and POHL may be due to Tonks's being current, wheras POHL's more familiar ones may not be. Perhaps recent revision of Vmo envelope?
By the way, what I do remember is that M0.886 indicated (Mmo) is M0.86 corrected. We used to cruise at 0.86 indicated, which was 0.835 corrected. Don't remember the error being that bad on the B707.
The low Vmo at the lower altitudes was a rather disappointing feature of a great aeroplane.
Last edited by Chris Scott; 24th Aug 2008 at 17:22.
Reason: Clarifications..