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Early kits used a different airfoil, than the later kits. The original Quickie had a GU airfoil canard. This airfoil was prone to lose lift when contaminated with bugs (or rain). This required significant increase in control stick back pressure to maintain level flight. (Many builders found this very disconcerting!) The contamination issue seemed to be resolved by the installation of vortex generators on the GU canard.
The LS1 canard solved the contamination issue, but it requires a carbon fiber spar.