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Unread postAuthor: wyz2285 » Tue Feb 05, 2013 12:51 pm

Oh that make sense. Then these darts won't work, I'd need real arrows... But I wanted something compact, an ordinary is too long.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Gippeto » Tue Feb 05, 2013 2:26 pm

If you find an archery focused sporting goods store, you can purchase the components for arrows seperately and build them to the length that you require.

If you decide to go this route, a fletching jig is highly recommended. Will save you grief, and result in a consistant product.


http://www.lancasterarchery.com/arrows/ ... nents.html
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Unread postAuthor: wyz2285 » Tue Feb 05, 2013 2:37 pm

Hum I can? The main body has different lengths? Thank s for the advice Gippeto but remember I live in Portugal, where even in the capital city there are only 2-3 weapon stores, and most of them only sell shot guns. The stores in my city only one sells archery stuff :(
What is a fletching jig?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 05, 2013 3:26 pm

Gippeto wrote:Kind of like blowing the paper cover off of a drinking straw.


My ex fiancée used to hate that :D
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Unread postAuthor: jakethebeast » Tue Feb 05, 2013 3:54 pm

What i accomplished today.

1. Bought a 55cm x 122cm x 0.9cm piece of birch plywood
2. Wax it black
3. Screw it to my wall
4. Attach fourt screen

Price: 12€ for the plywood, 30€ for the wall mount, and 40€ for the screen

The nerd factor...
PRICELESS!

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Unread postAuthor: MrCrowley » Tue Feb 05, 2013 4:07 pm

wyz2285 wrote:I'm thinking about buyingthese, and make a pneumatic launcher to use it. They're for 80 lb, I was wondering if I use too much pressure/muzzle speed will they fiy straight?
I've used them before, you can see the results in this video (1:55 onwards):
[youtube]http://www.youtube.com/watch?v=xngrgaZzOL8[/youtube]
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Unread postAuthor: wyz2285 » Tue Feb 05, 2013 4:23 pm

Ended up watching the full video, very entertaining as always.
Forget these arrows, if 300psi will do that, in my case they would have disintegrated long before hitting the target, much less accuracy.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: ramses » Tue Feb 05, 2013 6:31 pm

jakethebeast wrote:What i accomplished today.

1. Bought a 55cm x 122cm x 0.9cm piece of birch plywood
2. Wax it black
3. Screw it to my wall
4. Attach fourt screen


I assume this was only for the top monitor?
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Last edited by ramses on Wed Feb 06, 2013 1:37 pm, edited 1 time in total.
POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
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Unread postAuthor: jakethebeast » Wed Feb 06, 2013 1:45 am

Yep :D only for that, though i also cleaned my computers insides and cleaned my table, but yes all that was neede for the top screen
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Unread postAuthor: jackssmirkingrevenge » Wed Feb 06, 2013 1:54 am

Wow jake, with a setup like that I'm surprised you need a girlfriend :D
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Unread postAuthor: jakethebeast » Wed Feb 06, 2013 5:58 am

Actually, she plays about as much as me so she was pretty thrilled when i told her about this :D
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Unread postAuthor: jackssmirkingrevenge » Thu Feb 07, 2013 2:25 am

Gippeto wrote:Wyz...arrows are drag/spin stabilized....you need the fletching


Not quite, a weighted hollow tube should also fly straight.

Image

Image

Wyz, I think what you should be looking at is some sort of captive piston device, don't think MrC's shoddy sabot arrangement is something that should put you off using these 'arrows' :wink:
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Unread postAuthor: MrCrowley » Thu Feb 07, 2013 2:48 am

Wyz, I think what you should be looking at is some sort of captive piston device, don't think MrC's shoddy sabot arrangement is something that should put you off using these 'arrows'
I'm inclined to agree, but not necessarily because of my shoddy sabots :D

I think, with a pneumatic like the one I used, at close distance the darts fly straight, at medium distance you might have trouble, and at long distance they will fly straight. Without well-designed sabots, I think the escaping gases around the muzzle will upset the flight of the arrow because its tail section is very light and only has two fins. Over a short distance it wont make much difference but over a medium range the dart may still be wobbling or not flying entirely straight and you end up with the dart entering the target on an angle like I experienced from 10m (or whatever the distance was in my video). Over longer ranges, I expected the dart to correct itself and eventually fly straight. This problem might be averted if using a captive piston design.

Of course, that's only a hypothesis :)
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Unread postAuthor: POLAND_SPUD » Thu Feb 07, 2013 8:08 am

Look what I got

price + shipping just 4 euro

and the best part is that they are direct acting solenoid valves (so no pressure is required to switch them)
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Unread postAuthor: jackssmirkingrevenge » Thu Feb 07, 2013 8:32 am

MrCrowley wrote:I'm inclined to agree, but not necessarily because of my shoddy sabots :D


I think that you'll find that it is ;)

Of course, that's only a hypothesis :)


I think it has everything to do with how the arrow leaves the muzzle. If the sabot doesn't keep it perfectly straight (one which doesn't is by definition shoddy :D) and the arrow is pointing at say 30º to the linear motion, then clearly it is going to need to travel some distance to stop yawing and settle down.

If the arrow is properly guided, you shouldn't have problems.

A captive piston is ideal for this application because the arrow is relatively heavy and therefore you're not really looking for velocities higher than 500 fps or so, therefore if it is lightweight it will be easier to stop.

POLAND_SPUD wrote:and the best part is that they are direct acting solenoid valves (so no pressure is required to switch them)


Nice! and cheap too! Question is, what voltage do they need and what pressure can they handle?
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