What is the moment, in units of Nm, caused by just propulsion fan C in the hover

Question

What is the moment, in units of Nm, caused by just propulsion fan C in the hovercraft below? Assume the craft's axis of rotation passes through the indicated center of gravity (cg). Express the numerical portion of your answer rounded to three decimal places. Indicate a positive moment by not writing anything before the numerical answer (i.e. do not write the + symbol), and indicate a negative moment by writing a negative sign in front of the numerical answer.

Explanation / Answer

Moment about cg will be

(0.79*720+0.8*880+0.8*880)-(0.79*720)= 1.408Nm

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