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A place to ask general spud cannon related questions.
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Unread postAuthor: sagthegreat » Tue Feb 19, 2013 7:07 pm

Hello guys, Im a long time member, just lazy to log in, but I recently entered a contest on instructables, and entered in a how-to on a coaxial air cannon. I was wondering if you could go on the site and vote for my project, or just check it out.

LINK TO VOTE, GO HERE AND FIND "Co-Axial Pneumatic BB Gun" then click vote:http://www.instructables.com/contest/maketolearn/?show=ENTRIES&sort=ADDED&limit=18

LINK TO INSTRUCTABLE: http://www.instructables.com/id/Co-Axia ... ic-BB-Gun/

To whoever that votes, I greatly appreciate it
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Unread postAuthor: mobile chernobyl » Tue Feb 19, 2013 10:41 pm

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Unread postAuthor: jackssmirkingrevenge » Wed Feb 20, 2013 2:11 am

Thanks for the credit for the animation explaining how it works :P

Also, your 850 fps estimate is extremely optimistic, I doubt you are getting more than half that. It would help if you posted a screen cap of your GGDT simulation.

almost supersonic velocities


That is literally like having a 4.5 inch willy and saying that it is almost 6 inches :D
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Unread postAuthor: sagthegreat » Wed Feb 20, 2013 6:11 pm

Oh crap, imma give you the credit right away, srry dude, and i used a soda can chronograph to test it.
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Unread postAuthor: jackssmirkingrevenge » Thu Feb 21, 2013 2:21 am

Not trying to rubbish your work, when I was your age I was doing the same sort of thing, so please don't take this in a negative way. You've done a good job, but I think it can be improved and just wanted to offer some constructive criticism:

- "The attached picture shows how it works." should read "The attached animation by jackssmirkingrevenge from the spudfiles forum shows how it works."

I don't mind you featuring my work, as long as it's properly credited.

- "Penumatic Design" - it's only a little typo, but it sticks out like a sore thumb.

- A soda can chronograph is not a chronograph, more of a guesstimate. Why don't you document the use of this method in your instructable? Also, did you use a reference for airsoft like this: http://redwolfairsoft.com/redwolf/airso ... ulletID=34 ?

If I understood correctly you're using 4.5mm steel BBs, so if your reference is for airsoft then the comparison is irrelevant.

Also, if you've used GGDT, why don't you print screen and feature the simulation? And if you've used GGDT and liked it, why not link to the website? D_Hall was kind enough to write the program and distribute at no cost to you, so it is appropriate to show some appreciation.

- the only diagram there is represents another launcher, but doesn't tell us anything about how you build your own. Pictures are worth a thousand words, and they will certainly help those reading your post who have never seen such a launcher understand it better.

You don't need a sophisticated CAD program, even MS paint will do.

- photos, let's take this as an example:

Image

90% of that image is irrelevant, and the focus is poor. I appreciate that you might not have a proper digital camera, but you can still make the effort to take better photos. I'll use one of mine as an example:

Image

The parts are in focus and are clearly visible, and there aren't any body parts or electrical outlets on display. If your camera has a Image feature then use it.

Keep in mind that this advice is not only relevant to instructables, good presentation is essential for school and eventually many possible jobs, so if you start properly now it will pay dividends in the future :)
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Unread postAuthor: mobile chernobyl » Thu Feb 21, 2013 8:43 am

I wish spudfiles had a "like" button for that post JSR! lol :D

To the OP:

Beyond what JSR said - props for going through with creating an instructables guide, even if it needs some polishing work. Given the projects I've done in life up to this point - I wish I had created an instructables guide for even one of them! I really like that site and all the help it offers.
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