Basil Fairston wrote:
The B and the C are the same except that the B has a slightly heavier
wing to allow water ballast to be carried with the 16.6m tips on.
The B and C differ from the A as follows.
I think it was more substantial than "slightly": at least 20-30 pounds
is what I remember. The B model had more ballast allowed in the 15 meter
configuration, the wings were noticeably stiffer, but it was the favored
model for ridge running at high speeds.
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Eric Greenwell
Washington State
USA
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