I have found an article online from Yachting Monthly No 986 - Oct 88, that discusses wing keels in some depth. The article concludes with 'Next Month - in part 2, we test 2 Sadler 34s against each other, one with a Warwick Collins tandem wing, the other with a traditional fin' or words to that effect. Being the owner of a S34 with just such a tandem wing I have hunted high and low for a copy of that article. I'll be darned if I can find a copy of that second article or even the magazine. December issue yes, but not November. Anyone got one tucked away?