Tzitzit: Knots and Wraps

Tzitzit strings have five knots separating four wraps of strings. This applies to tzitzit whether on a talit katan or talit gadol. The minimum length for tzitzit strings: 
• From the first to fifth knots--at least 4 inches; 
• From the fifth knot to the bottom (lower end) of the strings—at least 8 inches.
The wraps go around the entire bunch of strings as follows:
• At top but below the first knot: 7 times 
• Below the second knot: 8 times 
• Below the third knot: 11 times, and 
• Above the bottom knot: 13 times
Note The total of the wraps' gematria values (7+ 8+ 11 + 13 = 39) equals the gematria values of Hashem (one of God's names) Echad (is One), as follows:
Hashem (spelled: yud, heh, vav, heh) = 26
Echad (spelled: alef, chet, daled) = 13
Hashem + Echad = 26 + 13 = 39