I don't know, I called Martyn when I bought my LS6c-17.5,
his comment was along the lines that upgrading to the
18m or 15m winglets from the straight 17.5 and 15m
tips wouldn't be worth it for the marginal performance
gain.

At 07:54 14 November 2004, F.L. Whiteley wrote:
the ls6/18 with tips that are unavailable in the US

last seen on Martyn Welles LS-6 at the 1994 UK opens.

'Stuart Kinnear' wrote in message
...
Which is the better glider ??
Stuart Kinnear