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Sat Oct 17 17:11:51 EDT 2015

slats spacing

9 = 5.5 slat
  + 3.5 space

(9 x n) + 5.5   
        - 3.5
        + 0 


middle:

(/    46.75      9) 5.2  *
(/ (- 46.75 5.5) 9) 4.6
(/ (+ 46.75 3.5) 9) 5.6 


space between outer slats:
35.75

W = 5.5. slat width
s =      slat spacing
n =      nb slats

((s + W) * n + s) = S

 n s + n W + s = S

 s (n + 1) + n W = S

 s = (S - n W) / n + 1


     (/ (- 35.75 (* 4 5.5)) (+ 4 1)) 2.75

     (/ (- 35.75 (* 3 5.5)) (+ 3 1)) 4.8

(+ 5.5 2.75)

     (+ 5.5 (/ (- 47 (* 5 5.5)) (+ 5 1))) 8.75





57.5



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