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A-Frame Trebuchet

A small training trebuchet model for learning levers, tension, and safe launching setup.

Advanced 3-4 hours

Materials Needed

  • 6-8 poles for A-frames and base
  • 1 straight pole for throwing arm
  • Rope for lashings and sling
  • Light counterweight bucket

Step-by-Step Instructions

1

Build A-Frame Base

Construct two A-frames and connect them with base rails.

Build A-Frame Base Diagram
2

Mount Throwing Arm

Install the pivot bar and lashing points for the throwing arm.

Mount Throwing Arm Diagram
3

Add Counterweight

Attach a secure counterweight on the short arm side and verify balance.

Add Counterweight Diagram
4

Load and Prepare

Set sling position, confirm clear range, and complete a safety check before use.

Load and Prepare Diagram

Required Lashing Techniques

Square Lashing

Used to join two poles at a right angle.

Diagonal Lashing

Used to join two poles at any angle, especially when under tension.

Round Turn and Two Half Hitches

A reliable knot for securing a rope to a pole or anchor point.

Safety Tips

  • Always work under adult supervision
  • Test the structure before full use
  • Check all lashings are tight and secure
  • Use appropriate safety equipment
  • Inspect regularly for wear or damage
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