If, disadvantageously, this angle were to be made less than 90°, then when the wing 22 encountered a fiber 11 lying along a wall of the V groove 14, a component of {HEAD ~ the force} exerted on {TAIL ~ the fiber} 11 by the wing 22 would be directed into the wall 
exerted on
If , disadvantageously , this angle were to be made less than 90 ° , then when the wing 22 encountered a fiber 11 lying along a wall of the V groove 14 , a component of { HEAD ~ the force } exerted on { TAIL ~ the fiber } 11 by the wing 22 would be directed into the wall
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