Design by R.F.Cook

These puzzles are based upon the Chinese Cross Puzzle, but looks also a bit like the Chestnut burr. The puzzles is formed by several bridge pieces and a smaller amount of key pieces. The pieces vary in length depending on the size of the puzzle. In fact the maximal size of a Chuck puzzle is endless. Below three types of Chuck puzzles are shown. The  de Baby-Chuck, Papa-Chuck en Grandpa-Chuck with 24, 56 en 96 pieces respectively. 

The diagram below shows the shape of the different pieces. Four bridge pieces and three key pieces are used for the three Chuck puzzles. The pieces must be made very accurate,  because the puzzles won't fit if the pieces  are to long. Piece A is three units long, piece B six units, piece C nine units and the length of piece D is twelve units.

For the Baby-Chuck, the smallest puzzle, you need six B-pieces, sixteen A-pieces and two As-pieces. The Papa-chuck is formed by six C-pieces, sixteen B-pieces, 28 A-pieces, two Bs-pieces and two As-pieces. The largest puzzle, the Grandpa-Chuck, is made by six D-pieces, sixteen C-pieces, 28 B-pieces, 40 A-pieces, two Cs-pieces, two Bs-pieces and two As-pieces.

Making these puzzles isn't very difficult. Although you need a lot of patience for making the larger Chuck-puzzles. If you really have acquired a taste for these puzzles, you can even built larger Chuck puzzles.