Quick one for Nick Lappos ...
I've just been reading your excellent treatise at
http://webpages.charter.net/nlappos/...comparison.pdf ...
(1) can you tell me why the BA609 on the front cover appears to have Bell/Boeing logo on the nacelle, when the original photo on the AW web-site has no such logo? ... methinks you fiddled in Photoshop or similar after copying this
PR photo from the AW web-site (sniggers)!
(2) how come X2 is a good idea, considering your argument on page 16 about disk size? I note that ABC was not proceded with because "... the transmission weight penalties were too high and so the trade study decided that the advantages were outweighed by the weight disadvantage" ... " The rotors had to be well separated and very stiff so that they wouldn't strike at high blade deflections. This resulted in a tall mast, which was very draggy. Inter-rotor fairings were designed and wind tunnel tested, but it was difficult to design a fairing that really resulted in a drag decrease..." and "It was difficult to use the ABC arrangement for anything but an attack helicopter, due to the big, tall gearbox assembly" ... ??? Some of these are your words ... [ref:
http://www.synchrolite.com/0891.html]
Bit off topic, but ...?