Ciamar a cho-dhùineas tu fad an t-seam le foirmle ann an teòiridh?

Tha grunn fhoirmlean ann airson fad nan sguaban obrachadh a-mach, mar as trice a rèir na foirmle.

L=1.12 × δ+ 1.4 × d

δ: Tighead sreap

d: Trast-thomhas rivet