Hull Form Summary - Boat Design Net

Knuckles (2)• In general, knucklesare used above theload waterline, andtherefore without anegative impact in thehydrodynamicperformance• However, sometimesthey are used underthe design waterline,for instance in thetransition between thebulb and the hull, whenaddition bulbs are usedM.Ventura Hull Form 67Knuckles• Knuckles can be created to:– Enable a high angle of flare to be used in the lower part of thesections, without this carrying on become too extreme in theupper part– Avoid the end of forecastle deck projecting in a way that mightcause contact with dockside cranes or similar– Improve sea keeping (although there is disagreement over this)by the detachment of waves from the shell– Reduce shipbuilding cost by increasing the number of platesthat do not need to be rolled in two directions.• For economical reasons in manufacture, knuckles aregenerally best positioned at a short distance above a deck(due to block assembly reasons).M.Ventura Hull Form 6834