For Graviman, yes the BERP and SK tips look similar, but its not just about the tip and the BERP "bit" applies to the whole blade too with the tip being the obvious change over a conventional aerofoil section. Nick may be able to shed some light over how the SiK blade section and twist varies across the blade diameter.
Nick, Like Dangermouse (here the similarity ends!) I too would be very interested to see how the BERP blade stall lines change with altitude and compare that with S92.
Do you think that the BERP blade stall line will be a problem for the Merlin crews when flying? Its just that I thought that retreating blade stall was pretty serious and that if it was common on the 101 it would have emerged by now.
It appears that the S92 has evolved a tip very similar in appearance to the 101? I think its right that the 92 is somewhat noisier than the 101 due to high mach tip effects but that is in the rumour world unless anyone can comment. Cant wait to see what son of BERP looks like.