All projectiles launched from a boat with an unfurled sail are applied a sail correction vector to eliminate landing deviation caused by boat movement. For instance, if the sail faces west, projectiles will land slightly west of the targeted position.
This mechanic is meant to simulate inertia and maintain a fixed relative position between the boat and projectile impact point, which works as intended for moving vessels.
Nevertheless, when a boat with an unfurled sail remains fully stationary — trapped against the shoreline for example — the sail offset is still calculated, leading to incorrect projectile landing positions.
Affected projectiles include snowballs from the Ice Flingomatic, catapult cannonballs, player-thrown items such as Brightshade Bombs, water balloons, Skeeter Bombs and Napsacks, as well as projectile attacks from creatures like squids and Misshapen Birds.
This unintended quirk is commonly exploited to build permanent freezing contraptions. The Ice Flingomatic will keep launching snowballs endlessly if its tasks (fire suppression, crop watering) cannot be finished. The sail offset skews its snowball trajectory, preventing task completion and triggering continuous fire. The non-stop high-frequency snowballs can permanently freeze any frostable items, creatures and bosses.
- Equip a sail on a boat, then navigate the boat to a spot where the shoreline blocks movement in a specific direction.
- Unfurl the sail and turn it toward the blocked shoreline, leaving the boat immobile even with the sail active.
- Throw or launch an arcing projectile at a designated target.
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Check and compare the aimed position with the actual impact point to confirm the offset error.
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