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Catapult  -  Build a Catapult  - Catapult Design Plans Catapult Kit More Catapult Plans
From  The Crossbow  by Sir Ralph Payne-Gallwey 1903 Roman Artillery Plans Catapult Animation
Catapult - Top View
Catapult - Top View
Easy to Build Catapult Projects
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Catapult  - Top View

I & II - Side Plates - 10 ft. 6 in. long, 1 ft. thick, 21 in. high forward of the skein bundle & 15 in. high aft.
III - Aft Cross Piece - 4 ft. long, 1 ft. thick, 15 in. high.
IV - Forward Cross Piece - 21 in. high, 1 ft. thick.
V - Center Cross Piece is 6 in. square.

Cross Pieces are mortised and  tenonned into the Side Plates

A - Skein of twisted cord - 8 in. diameter
B - Large Wheel
C - Pinion Wheel
D - Spindle Heads
E - Arm - 7 ft. long, 4 1/2 in. thick. Width tapers 8 in. at the butt, to 6 1/2 in. at the slip-hook ring bolt.
F - Roller 7 in. diameter
G - Spindle
H - Mortises for Uprights
K - Mortises for Sloping Supports
 

Catapult - Side View
Catapult - Side View
Catapult  - Side View

A - Arm is  wound down with 1 1/4 in rope.
B - The catapult arm is fully wound down with a stone in the cup.

By pulling the the cord (E), the catpult arm is released from the slip hook and returns to its original position at A.

C - The position of the catapult Arm at the moment the stone leaves the Cup. The stone is projected upward at  45 degree angle (D). 

Click Here  to See a Catapult Animation.

Catapult - Front View
Catapult - Front View
Catapult  - Front View showing the large top cross piece.
 
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Catapult - Rear View
Catapult  - Rear View
Catapult  - Rear View showing the rope, winding roller, slip hook trigger, skein, winches and winch spanner.
 
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Why does this Catapult  use a  Sling  ?
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Catapult - Skein Winches
Catapult - Skein Winches
Catapult  - Skein Winches

I - Surface view of one of the winches and its plate.
II - Side view of a winch as fitted in the catapult, with one end of the skein in position over the cross-bar of the large wheel of the winch.
III - Side view of the large wheel of the winch.
IV - Winch cross-bar.
V - Perspective view of the large wheeland pinion wheel of the winch.

Catapult - Skein
Catapult - Skein 
Catapult  - Skein 

A - The skein as first wound over the cross-bars of the large wheels of the winches.
B - The skein with the butt-end of the catapult arm placed between its halves.
C - The skein twisted up by the winches.

Catapult - Slip Hook
Catapult - Slip Hook
Catapult  - Slip Hook

The metal slip-hook pulls down the catapult arm and also releases it. The lever, or handle is 10 in. long. The point of the hook, in the eye of the bolt, is 1 in. thick.

Catapult - Metal Catch for a Small Catapult
Catapult - Metal Catch for a  Small Catapult
Catapult  - Metal Catch for a Small Catapult

I - The end of the catapult arm (F) is held from escaping by the projection (B) of the hinged catch (D).  Knocking the end of the lever (A) with a mallet, releases the  leg of the catch (E). 
II - The catch then rotates, releasing the catapult arm (F).
III - Surface view of the catch holding the catapult arm.
IV - Perspective view of the catch.

 

Completed Catapult
Completed Catapult
Build This Catapult
Completed Catapult
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