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Steel john boat 16 ft — 3D model in WeldCanvas

Steel john boat 16 ft

Flat-bottom, square-bow steel john boat: 1" square tube frame with ribs about every 24", 14 ga bottom, 16 ga sides, 11 ga transom. MAXIMUM LOAD: 800 lb total — people, motor, battery, fuel and gear together. How that was worked out: the hull holds 92.0 cubic feet below the 15" motor notch, so it can push aside 5,740 lb of water before water comes in. The boat weighs about 606 lb (580 lb steel + 26 lb foam). The Coast Guard rule for small outboard boats allows (5,740 − 606) ÷ 5 = 1,027 lb; this design posts only 80% of that. Put at least 13 cubic feet of closed-cell foam under the seats and in the bow so it floats if it swamps. Cut a 7" motor notch in the transom so the motor sits 15" above the bottom (short-shaft motor). Add a wood floor so the 14 ga bottom doesn't dent underfoot; floors and seats add weight, so subtract them from the maximum load.

Size
16' long × 60" wide, 22" sides, 15" transom
Skill level
Advanced6 cuts at angles other than 45°
Pieces to cut
54 plus 23 sheets
Steel
About 140 ft, 7 sticks to buy
Plan price
$10.99, yours to keep
Open this plan in WeldCanvas

Steel you'll need

  • 1×1×0.083 (14 ga) square tube54 pieces
  • 11 ga steel sheet (0.120")1 sheet
  • 14 ga steel sheet (0.075")7 sheets
  • 16 ga steel sheet (0.060")15 sheets

Also buy

  • Closed-cell pour foam or foam blocks (amount in the description)
  • 3 bench seats (wood or aluminum boxes over the foam)
  • Transom motor pad (3/4" treated plywood)
  • Bow eye and stern eyes
  • Drain plug
  • Marine primer and paint, inside and out
  • Wood floor (optional)

What the plan includes

  • A cut sheet: every piece drawn to scale with tip-to-tip length and the saw setting for each end
  • A shopping list and a cutting plan that gets every piece from the fewest sticks
  • Build steps: what to tack first, how to check square, and a weld order that keeps it straight
  • A 3D model you can resize — change a size and the cut list follows
Safety note. Safety-critical: a homemade boat. Not engineered or Coast Guard tested. Never load past the maximum on this card, always wear life jackets, keep the foam in, and check your state's rules for registering a home-built boat.

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