Jump-N-Jack
The jack-knife trailer boat
- Category
- Outboard Runabouts
- Designer
- Berthel Madsen
- Published
- Boat Builder's Handbook, Volume 8, 1958, p. 113
- Craft Print
- 192
Boat and trailer in one for fishermen and campers. Row it or run a small outboard; fold it over like a jack-knife and it becomes a one-wheel trailer holding 40 cu ft of gear. Built in one piece without a form, then sawn in two, and each half floats on its own.
Specifications
- Length
- 9 ft 7 in
- Beam
- 3 ft 10 1/2 in
- Depth
- 2 ft
- Weight
- 120 lb
- Capacity
- 2 persons (4 in a pinch)
- Construction
- 1/4 in. exterior plywood with oak framing; built whole, then sawn in two
- Power
- Oars or outboard up to 5 1/2 hp
Downloads
Plan sheets 6
Tap a sheet to open the full-size scan. On a computer, right-click it and choose “Save image as” to keep a copy; on a phone, press and hold.





