Seatapult

A half-size, rideable catapult. You don't load a ballista and watch it aim — you climb into the operator's seat, aim the machine yourself, fire items from its ammo-store chest, and (optionally) eject yourself across the map.

A Valheim BepInEx 5 plugin built on Jotunn.

Features

• Seatapult build piece (Hammer > Misc), 20x Wood / 15x Stone / 5x Iron, cloned from the vanilla Ashlands Catapult at half size.
• Operator's seat with full aiming: arm angle, aim yaw, and launch power.
• Ammo store: a chest on the machine — anything placed inside can be fired (or filter it with AllowedItems).
• Ejector seat: launch yourself along the aim direction, with no fall damage and a synthesized cartoon scream by default.
• Deploy legs, adjustable power, in-game HUD panel while seated.

Requirements

• BepInEx 5 (denikson-BepInExPack_Valheim)
• Jotunn 2.30.x (ValheimModding-Jotunn)

Installation

1. Install through your mod manager (recommended).
2. Manual: drop Seatapult.dll into BepInEx\plugins\.

How to use

1. Restart the game after installing (the build piece is registered at startup).
2. Build the Seatapult from the Hammer under Misc and place it on solid ground.
3. Open the ammo-store chest (on the machine) and load it with items to fire.
4. Hover the seat and press E to sit. A HUD panel shows angle / aim / power / cooldown.
5. While seated:

Key	Action
Shift+F	Fire — launches the next allowed item from the store
Shift+Up / Shift+Down	Increase / decrease power
W/S or Up/Down	Raise / lower the arm angle
A/D or Left/Right	Swing aim left / right
V	Deploy / retract the legs
T	Eject yourself along the aim direction
E	Stand up

Configuration

Generated on first launch at BepInEx\config\com.seatapult.seatapult.cfg:

Section	Key	Default	Description
General	Enabled	true	Master toggle.
General	AddBuildPieces	true	Register the piece (restart).
General	Scale	0.55	Model scale (0.25-1.0). Restart.
General	DebugLogging	true	Log Seatapult events.
General	DeployHeight	0.9	Lift height when legs are deployed (m).
Controls	DefaultAngle	25	Starting arm elevation (deg).
Controls	AngleMin / AngleMax	-10 / 75	Arm elevation range (deg).
Controls	AngleSpeed	30	Arm speed (deg/s).
Controls	YawSpeed	45	Aim yaw speed (deg/s).
Controls	PowerStep	0.08	Power per Shift+Up/Down.
Controls	DefaultPower	0.5	Starting power (0-1).
Combat	FireCooldown	2.5	Seconds between shots.
Combat	EjectMultiplier	1.0	Power multiplier for the ejector seat.
Combat	EjectNoFallDamage	true	No fall damage when ejecting.
Combat	EjectScream	true	Play a cartoon scream on eject.
Combat	EjectScreamVolume	1.0	Scream volume (0-2).
Ammo	AllowedItems	(empty)	Comma-separated item names to load. Empty = anything in the store.

Notes

• Co-op: only the ZDO owner of the piece can fire (others see a warning). Projectile visuals are local to the owner.
• AddBuildPieces and Scale need a restart; most other settings apply immediately.

Changelog

See CHANGELOG.md.