Miff 3:

Land Rover AFRICA Magazine - - MIFFBUSTERS -

Never even con­sider snatch­ing with a tow rope This ‘miff’ is in­tu­itively ac­cepted as true; some cal­cu­la­tions would be re­quired in or­der to pro­vide con­fir­ma­tion though. In or­der to make the same cal­cu­la­tions, a 16-ton tow rope is taken with a to­tal as­sumed stretch­ing length of 100 mm (some stretch­ing will oc­cur but will be very limited). Fol­low­ing the same ap­proach as be­fore yields a max­i­mum rope force of 8.89 ton. How­ever, as­sum­ing the same start­ing speed of 4.2 m/s and bring­ing it to a stand­still within 100 mm would re­quire a de­cel­er­a­tion force of 221 000N or 22.5 ton to achieve! This merely im­plies that the rope’s stretch ca­pac­ity is im­me­di­ately ex­ceeded, and the rope slammed tight (or some­thing breaks be­fore reach­ing the 22-ton force in the rope). The first ob­ser­va­tion has to be that the force on the tow bar is im­me­di­ately hor­rific, with some­thing sure to yield and break off. The force is in fact of such na­ture that any weak point in the chas­sis is at risk of break­ing. With the stop­ping dis­tance only 100 mm, the driver will by de­fault ex­pe­ri­ence a jaw-break­ing back­ward jerk (even at such small speeds). Plot­ting the forces over the stretch dis­tances clearly shows the more grad­ual rise in the 8-ton rope and the ex­treme rope snap for the tow rope.

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