# Hybrid of Hart's A-frame and Chebyshev linkage

Hybrid of Hart's A-frame and Chebyshev linkage

**Hart's A-frame and Chebyshev linkage are very similar each other.**In Chebyshev linkage,
sin(0.5 ∠BFD) + sin(0.5 ∠AED) ≒ constant
is true.
WHY?
(IF you know Hart's A-frame, its fact is evident, maybe.)

**■ CQ length calculation by another way**from Hart's A-frame law, CQ×QD = DE×EA is true, so CQ = sqrt(DE×EA)=sqrt(1×5)=√5 (∵ CQ=QD)## New Resources

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