The term mean of mean of mean draught is also termed as Quarter mean draught. Commonly used in draught surveying. Lets see how the quarter mean draft is derived.
Consider,
Fwd draught = Fd
Midship draught = Md
Aft draught = Ad
Mean draught = (Fd + Ad) / 2
Mean of Mean draught or Half mean draught
= (((Fd + Ad) / 2) + Md)/2
= (Fd + Ad + 2Md ) /4
Mean of mean of mean draught or Quarter mean draught
=((Fd + Ad + 2Md ) /4) / 2
= (Fd + Ad + 6Md) / 8
The mean of mean of mean is the draught that is used to refer the stability booklet or the hydrostatic tables with.
Consider,
Fwd draught = Fd
Midship draught = Md
Aft draught = Ad
Mean draught = (Fd + Ad) / 2
Mean of Mean draught or Half mean draught
= (((Fd + Ad) / 2) + Md)/2
= (Fd + Ad + 2Md ) /4
Mean of mean of mean draught or Quarter mean draught
=((Fd + Ad + 2Md ) /4) / 2
= (Fd + Ad + 6Md) / 8
The mean of mean of mean is the draught that is used to refer the stability booklet or the hydrostatic tables with.
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