How many rules does this catapult design break? :)

[372 lives on]

how about
[R14]
No individual item shall have a value that exceeds $400.00. The total cost of Components purchased in bulk may exceed $400.00 USD as long as the cost of an individual Component does not exceed $400.00.


last time I checked the bow this came from cost around $900...

[teh_lol]

Originally Posted by 372 lives on

how about
[R14]
No individual item shall have a value that exceeds $400.00. The total cost of Components purchased in bulk may exceed $400.00 USD as long as the cost of an individual Component does not exceed $400.00.


last time I checked the bow this came from cost around $900...

You can buy just the limbs for a bow depending on the company that makes it and the piece that is taken.

[DavisDad]

Originally Posted by 372 lives on

how about
[R14]
No individual item shall have a value that exceeds $400.00...
...last time I checked the bow this came from cost around $900...

I paid $40 at Reedy's Archery shop (Middleboro, MA) for a used set. The guy gave me a discount when I told him about our robot competition. He said he could get $80 used. I assume they cost about 2x that. I couldn't find a price on-line for the limbs new.

[DavisDad]

My son and I tested the latest version of the “compound catapult” yesterday; properly sized cylinder and trigger release (couldn’t exhaust air fast enough}. We hit 6/6 @ 27.5’ (video below) until part failure. We were setting range by adjusting pressure until bow limb deflection was the same as measured by a caliper. We were cocking to about 75% of max force. We are working on the load beam/pressure transducer feedback cocking mechanism…

http://simhardware.org//img/Compound...atics30fps.MP4
http://simhardware.org//img/Compound...tics240fps.MP4

[kclark]

I'm planning on making a smaller one of these for a project for college, where did you get the air cylinder from?

[DavisDad]

Originally Posted by kclark

I'm planning on making a smaller one of these for a project for college, where did you get the air cylinder from?

http://www.bimba.com

You can buy direct from the "Buy Online" page.

Have fun!

[kclark]

do you know the part number you used?

[kclark]

Originally Posted by DavisDad

http://www.bimba.com

You can buy direct from the "Buy Online" page.

Have fun!

do you know the part number you used?