By: Jacob Anderson

DesignsArm

Pivot LocationLaunch Sac

Triggering Device

-Floating Arm Trebuchet-Hinged Counterweight Trebuchet

-Floating Everything Trebuchet-Wheel/spoke Trebuchet

PROS CONS

Efficient when callibrated

Counter weight falls straight down

Gap in tracks Difficult to construct

PROS CONS

Easy to build More efficient than

fixed counterweight Arm Settles faster

Less potential energy than fixed counterweight

Extra shock load on the axle

PROS CONS

Shorter than the floating arm

Small track gap

More derailments Arm may hit the

track

PROS CONS

Very Adjustable Possible long arm

Heavy wheel

-wood-metal

-golf club shafts-carbon fiber

Wheels on a track start and end is at the middle

Triggering device could be made of a pin with a loop through the pin and 2 eylets near the arm in resting position. The the pin could slide through the eylets and one on the arm and that would keep it there. Then when the string is pulled it would release the projectile.

I would create a launch sack out of leather. The leather is lightweight and does not cling to materials unlike suede. I would buy a piece of lleather sew it into a puch and then add 2 pieces of string to it.

My device would have base made of 2x4s and have 4 2x4s sticking upright from the corners of the pase to support the rail. The rail would have a piece of would with 2 smaller thinner pieces to create a track for the wheels. I would use rollerblade wheels for my wheels. I would have metal tracks for the counter weight to vall on. My arm would be made of wood tapered to a smaller point and have wheels attached to the middle.