[dhitchco]

The tetra "intra-stacking distance" is NOT in any of the official document or drawings (as far as I can tell).

However, in order for a tetra (or stack of tetras) to be counted as officially "SCORED" (three points each), all four apexes of the top-stacked tetra(s) MUST be within six (6) inches of the SUPPORTING structure. Reference ch. 4.2.1 top of page 4

Therefore, you should assume that the "clearance" between the goal and the first tetra or between any two other stacked tetras is less than six inches.

*** Best guess is that a "properly seated" and stacked tetra has a distance of four inches between the top of apex #1 and the bottom-side (clearance) of apex #2. Assumes the tetra and goal are both made out of the competition materials and use the competition "clover" to connect the tubes.

Remember that the clearance height of the eight goals is approx. 5.25' and the clearance height to the center goal is approx. seven feet.