Yes, a ship that is 50m long would be 575mm long at 1:87 scale.
The O scale model Sven referenced is 600mm long. O scale is around 1:76 scale. To convert from the 1:76 scale to the 1:87 scale you would print the 1:76 scale at 87.36% and the ship would be 524mm long.
Big models.
