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Hooker in 'Not much of an engineer' mentions the W2/500, but I can't find it now.
In Appendix I he lists the relationship of many RR & Whittle engines & says "Derwent II introduced Whittle's W2/700 impeller casing ..." GilesW (talk) 15:22, 15 October 2009 (UTC)Reply
In the 'Specifications' for the W2/850 the thrust is quoted as 2485 lbsf and the fuel flow as 2610 lbm/hr. These values are not consistent with the quoted sfc of 0.4 lb/hr/lb. (If the W2/850 was a turbojet of pressure ratio 4:1, as stated, the sfc could not have been anywhere near 0.4).
What is reference 4 - Jane's, 1989? Not the big year-book, surely? — Preceding unsigned comment added by 86.152.112.92 (talk) 12:39, 18 October 2012 (UTC)Reply