For a three-cylinder radial engine, the primary and direct reverse cranks are as shown in the below Fig. 70.

\((\mathrm{W}=\) Weight of reciprocating parts per cylinder).

Which one of the following pairs is not correctly matched in this regard?

(a) Primary direct force \(\ldots \frac{3 W}{2 g} \omega^{2} \cdot r\)

(b) Primary reverse force ... Zero

(c) Primary direct crank speed \(\ldots \omega\)

(d) Primary reverse crank speed \(2 \omega\).

C 00 3 Primary direct cranks Fig.70 Primary reverse cranks 2