The Fulmars were introduced to replace the Westerly 31s - Berwick Longbow Pentland and Renown - and in performance terms were unequalled at the time (The Fulmars that is, not the W 31s!).
In The Westerly Owners Association Definitive Guides it says " Marry a Fulmar by all means but get a Typhoon as your mistress!"
Once more to quote the Definative Guide, "One does not really have to sail a Fulmar, one just lays a hand on the tiller and lets the boat take care of everything else..."
There's nothing more to be said really!
Keel Width 97" (measurement point not stated)
The Westerly Owners Association Definitive Guides
Lots of Fulmar stuff here Richard Spencer's Fulmar Inadee site