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Hatra Ballista Jr: Shooting
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Various pictures and stories of launching Hatra Ballista Jr.


First Pumpkin Launch

An attempted water bottle launch. This one didn't fair so well.


Here is an animation of
Hatra Jr's first launch of a pumpkin. The pumpkin weighted 2lbs, 10oz, and flew between 210 and 220 ft.

Mouse Step Animator: Press Play or drag the Slider to switch frames.

01 02 03 04 05 06 07 08 09 10 11


Videos


Google Video Service
Hatra Ballista 1st Shot 2007


Information:
first shot of the 10 and under catapult Hatra Ballista, at the 2007 Punkin Chunk
45 sec - Nov 6, 2007


Google Video Service
2007 Punkin Chunk Nov 3rd - Hatra Ballista shoots a punkin during testing


Information:
At the 2007 Punkin Chunk (Nov 3rd) - Hatra Ballista Jr shoots a pumpkin during testing. Test fired with more torsion than earlier in the day, and with a new spouch in the bowstring. Owen operates the horn. Stuart fires.
9 sec - Nov 5, 2007


Google Video Service
Hatra Ballista 2nd Shot 2007 (highspeed)


Information:
slow motion shot of Hatra Ballista\'s second shot at the 2007 Punkin Chunk
11 sec - Nov 6, 2007


Additional Pages for Hatra Jr
Hatra Ballista Jr After building and testing Baby Hatra Ballista, it was clear this design was worth pursuing. Eric decided we needed a mid-sized model which we could then enter into the World Championship Punkin Chunk in the 10 and under category.
Hatra Ballista Jr: Spring Frame A Hatra Ballista Spring frame is a bit different from a Straight or V spring ballista.
Hatra Ballista Jr: Scapus Frame There wasn't much to go on with historical references for the Hatra Ballista, just a meta spring frame covering, and an artist's rendition in the book Greek and Roman Artillery 399 BC-AD 363. As such, I opted to go with a mix of what we did with Mista Ballista in metal, or Baby Hatra Ballista.
Hatra Ballista Jr: Torsion The load bearing parts for Hatra Ballista Jr are very similar to what I made for Onager Jr, though I've made several changes to help assist in the operation and use of the machine.
Hatra Ballista Jr: Arms and Bowline A hatra ballista has inward swinging arms that allows for 90 degree's of rotation during the throw. Our model has 3 foot long arms. For our first year, these arms were made particularly strong.
Hatra Ballista Jr: Deployment Hatra Jr is easy to deploy. That's one of the reasons it took so much extra time to build the thing.
Hatra Ballista Jr: Shooting
(This Page)
Various pictures and stories of launching Hatra Ballista Jr.


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Twas' brillig, and the slithy toves did gyre and gimble in the wabe...
Last Modified: 09/17/10