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## Main Question or Discussion Point

my book gets this expression for inertia force of the reciprocating masses of the engine

F=(R/g)ω.ω.r(cosθ+(cos2θ)/n) ,but there is no derivation given as to how he gets the accleration part,is it using the accleration diagram?and why should n be involved,

n supposed to be the l/r ratio.

F=(R/g)ω.ω.r(cosθ+(cos2θ)/n) ,but there is no derivation given as to how he gets the accleration part,is it using the accleration diagram?and why should n be involved,

n supposed to be the l/r ratio.