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Floating Arm Trebuchet Plans Download

Don't forget to download the free plans for use in Google SketchUp. All comments are welcome!
Click to Download Trebuchet Plans
6 Foot Floating Arm Trebuchet Plans If you don't have Sketchup get it here Sketchup
You might also want to check out our pool table restoration site at HowToPool.com
Some news for you!
The parts list has now been added in Page 5. General construction steps coming soon. Please contact us with questions or corrections!
The site may also be moving to a different domain. We have so many projects in wood, metal, mechanics, electronics (both new and old school), blacksmithing (including chain mail), and other skills.

Views of the Trebuchet

Here are some basic images showing the trebuchet from different angles and other images with some close-ups on the more important components.

Side View

This is the side view with measurements.
Side View

Edge View

This is the edge view from the lower wheel side.
Edge View

Upper Wheels

Upper Wheels

Top of Trebuchet

Top of Trebuchet

Release Nail, Catch and Sling Rope

This is just a nail that was pounded in and had the head cut off with a hacksaw along with another piece of metal to wrap the projectile rope around. You will want to bend the release nail a little towards the direction of the target and adjust it slightly while you experiment with different counterweights and projectiles. Originally we had it straight up and down and that was making line drives or throwing the projectile into the ground.

The rope that attaches to the sling is about 44" on one side and about 46" on the other but that doesn't include the knots. You can read down below under the 'Projectile Trough' heading that we adjusted the ropes on both sides to make them even so when the treb was armed the sling and projectile was all the way towards the edge of the trough near the middle. As we fired the ropes tightened and we readjusted the knots. It was mostly trial/error.
Release Nail and Catch

Projectile Pouch

This was made out of doubled over denim and we sewed around the holes we cut through. When adjusting the rope make sure it is even from the release nail and the other fixed side. The finished sling is 3" x 11" with a little over 1 3/4" fold over on each side before it was sewn. I think the original size of denim before folding and sewing was 12" x 15". The 12" side was folded in the shape of an 'M' and then the sides were folded in and sewn on the edges and a sewn circular pattern where we put the rope through.
Projectile Pouch

Lower Wheel

For ours we cut a groove in the lower wheel and did a complimentary cut on the throwing arm.
Lower Wheel

Counterweight Release

This is a eyebolt that was ground down smooth. A better way would be to have a drop gate on a hinge that is easier to pull.
Counterweight Release

View of Drop Area

This is a view of the drop area between the vertical supports.
Drop Area

Lower Wheel View

This is the detailed view of the lower wheel. We cut some wood spacers to keep it relatively centered but you can use additional washers.
Lower Wheel View

Release Pin

We tied a rope around a washer so the throw release was smoother.
Release Pin

Projectile Trough

This was just some thin plywood. We adjusted the ropes so the pouch and projectile came right to the edge of left side of it near where the weights drop.
Projectile Trough

Weight Bar

This was just some old black pipe that was polished up and inserted through the arm. It was kept in place by an eyebolt, washers, and nuts.
Weight Bar

Vertical Support Bottom

The vertical supports had a wood spacer on top and bottom and on the bottom it was reinforced with additional material.
Vertical Support Bottom

Side View of Far End

Side View of Far End

Side View of Wheel End

todo

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