Steamboat Forsvik from Forsvik

	9.5	2.0				2.2
Built in 1867 at Lindahl och Runer, Gävle Sweden
Call sign	Measures in meter			Tonnage		Engine kW	Speed Knots
Call sign	Length	Beam	Draught	Gross	Net	Engine kW	Speed Knots
Locomotive type fire tube boiler. 3 bar
Single cylinder engine with "Carlsund thread" valve-gear.

Steamboat Forsvik in harbour
Steamboat Forsvik at her home bridge. This steamboat has a very unique valve gear.

The engine onboard Steamboat Forsvik

Steam boiler
Steamboat Forsvik.

The Steamboat Forsvik wood-fired boiler. The stoker fires the boiler from the fore-side of the boiler.

The Steamboat Forsvik single cylinder engine.
Notice the steering wheel at the top of the picture. The captain navigates and operates the engine. The reversing handle below the steering wheel is provided with the pinion that reverses the engine.

At the bottom of the picture is the patented "Carlsund thread" valve-gear.
The crankshaft is provided with longitudinal slots. A casing, yellow on the picture, connected to the eccentric is provided with thread-like slots. An outer axially movable casing with a number of concentric rings is provided with blocks, blue on the picture, that slide in the slots of the eccentric-casing as well as the slots of the crankshaft. A pinion moves the outer casing axially, as a rack gear, and that movement turns the eccentric on the crankshaft and the engines rotation reverses.

The Steamboat Forsvik's Carlsund thread valve-gear is unique nowadays.

Steamboat Forsvik from Forsvik