What is the LCG required for zero trim for at specific draft? (Hint no calculation is required.)
To be clear a zero trim condition is that where the forward and after draft are equal provided there is no hull deflection.
Why would you want to know this? Just consider receiving orders to take maximum cargo to arrive at a specific draft for discharging. If you know the required LCG it is easy to work backwards to determine the required sailing draft at the loading port as well as the maximum cargo to load.
Sadly, this is not a license question. I have found only about 1 in 100 Chief Officers and Vessel Master's know the answer.
To be clear a zero trim condition is that where the forward and after draft are equal provided there is no hull deflection.
Why would you want to know this? Just consider receiving orders to take maximum cargo to arrive at a specific draft for discharging. If you know the required LCG it is easy to work backwards to determine the required sailing draft at the loading port as well as the maximum cargo to load.
Sadly, this is not a license question. I have found only about 1 in 100 Chief Officers and Vessel Master's know the answer.
Very simple: LCG for even keel drafts = LCB
ReplyDeleteWhy, because the hydrostatic tables normally assume zero trim, zero list, no hog or sag, draft is located at LCF and the vessel is floating! Be careful on newer ships there can be 5 sets of hydrostatic data calculated for various assumed trimmed conditions. In this case you must use the zero trimmed hydrostatic data.