A tender ship is one with a very small GM caused by KG being too large. This occurs if too much weight is placed high up within the ship. The ship will have insufficient stability, righting moments will be very small when heeled causing the ship to be sluggish and slow to return to the upright. Roll period will be long. (A tender ship is still a stable ship i.e. M is above G.)
In other words we can explain stiff vessel as:
- Small GM (but not negative ) due to loading on top
- Ship rolls very slowly
- Uncomfortable but better than stiff ship
A very small GM should be avoided for the following reasons:
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