MCS is very easy to work out. It is the (30kg) deflected length (420 for a 430 mast) x10 divided by the deflection at the middle of the mast in mm. Example below is a Powerex manufactured Flying Objects Mast 430cm IMCS quoted at 21 EG: 4200 / 171 = MCS 24.5 use the conversion chart to convert to IMCS: EG: 24.5 X .86 = 21.07
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