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Rastamuffin Has Performance Problems

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Pilgrimman » Sun Jan 18, 2009 4:44 pm

About the rubber ball... The issue might be the sectional density of the ball. If it is hollow, it is less likely to have a good range, as opposed to a solid projectile.

However, the issue for performance in general is almost certainly your valve. I would highly advise putting a lever on it, as has been suggested, and maybe lube the valve. I have HEARD that lithium grease or similar will work, but I have never personally used it. You are maily trying to decrease the opening time, as valve flow is already very high. If you are feeling especially energetic, you could put a pneumatic ram on it. Bottom line: experiment with ways to open the valve faster.

If you were to film yourself shooting, and you took a still when you first see air coming from your cannon, you could see how much the valve is turned in that frame, then on your cannon, you could compare the corresponding "openness" of the valve.I HIGHLY doubt the cross section would be more than an inch or two before the projectile has left the barrel (hence performance issues). Decreasing opening time will increase the amount of air that can get to the projectile before it has left the barrel.
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Unread postAuthor: rastamuffin » Sun Jan 18, 2009 9:36 pm

how did u make it attached to a string or spring loaded could u post some pictures i want to make opening it as efficiant as i can with what i have. A VIDEO WOULD BE GREAT!!!
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Unread postAuthor: MrCrowley » Sun Jan 18, 2009 10:13 pm

Well you have a tension spring (the kind that stretches) attached to the ball valve handle, you then attach the other end to some place on your cannon so that the spring is trying to move the ball valve handle so the ball valve opens.

You then have another force, such as a string or maybe even another spring, pulling in the other direction, this keeps the handle stationary and the ball valve closed. You then need to work out a trigger that when activated will let the secondary force (a piece of string or another spring) go and allow the main spring to pull the handle and open the valve.
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Unread postAuthor: rastamuffin » Sun Jan 18, 2009 10:29 pm

what is pneumatic ram and how would i goabout attaching it?
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Unread postAuthor: MrCrowley » Sun Jan 18, 2009 10:34 pm

rastamuffin wrote:what is pneumatic ram and how would i goabout attaching it?

http://www.google.co.nz/search?source=i ... meta=lr%3D

Use your head and common sense, we're not here to spoonfeed you all day.
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Unread postAuthor: rastamuffin » Sun Jan 18, 2009 11:32 pm

how bout you help me, his is my first canon and i thought maybe that the pneumatic ram was a spud gun related thing but w/e i still dont know howi would use it
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Unread postAuthor: MrCrowley » Sun Jan 18, 2009 11:39 pm

rastamuffin wrote:how bout you help me, his is my first canon and i thought maybe that the pneumatic ram was a spud gun related thing but w/e i still dont know howi would use it

How 'bout you do a little research. This isn't helping, this is spoonfeeding.

Helping on Spudfiles is what you do when someone understands a principle or concept and you help them make/design something. You have no idea what it is, so go find out what a pneumatic ram/cylinder is and what it does and how it works. It wont take more then 15minutes I'd imagine. Stop being lazy.

Pneumatics are a spud gun related thing, are they only found on spud guns? No, because you said it yourself, they're only 'related'. Spud guns pretty much borrow every concept and principle from something else, meaning there is usually plenty of information on most 'spud gun related' things.

So once again, stop being lazy. Do a little research so you know what you are dealing with, and then we'll talk.
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Unread postAuthor: rastamuffin » Sun Jan 18, 2009 11:47 pm

you're a hater but the reason i came here is because i have no idea an id imagine that most people here do :roll:
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Unread postAuthor: MrCrowley » Sun Jan 18, 2009 11:53 pm

rastamuffin wrote:you're a hater but the reason i came here is because i have no idea an id imagine that most people here do :roll:

Yeah i'm a hater, that's why I just described exactly how to rig up a spring loaded ball valve when you asked how.

Look, not many members here help people when they have no clue what they are doing, and those that do are usually new and soon stop. Why?

1: Those who don't know exactly how things work or why they work, usually have a lot of difficulty trying to design something incorporating it.

2: Those who don't know exactly how things work or why they work will usually end up building their cannon wrong and most likely unsafely. Safety is a big issue here at Spudfiles.

3: Why should we spoonfeed you information that you can learn in 10 minutes if you got off your lazy ass and tried to help yourself for once.


id imagine that most people here do

Yeah you're right. And you know why most people here know how they work, is because THEY DO THEIR OWN FRIGGIN' RESEARCH. We're not a pneumatics forum here at Spudfiles. We incorporate ways to use pneumatic rams, but we assume those who read the post/topic already know how and why they work. If you don't, tough, you'll have to learn.

But once you know how and why they work, we can help you incorporate one. It's like if I asked you to write me a calculus equation when you don't know calculus.

Get it? No? Tough. We're not helping you until you do the research.

Edit:

If I had decided to help you, by typing out the Wikipedia article for pneumatic rams, you would've thanked me not knowing the difference between something i've written personally and something I found on the internet.

So why don't we skip the middle man and just read the article directly from Wikipedia? It should describe it to you in the same way one of us here at Spudfiles would. Spudfiles is part of the internet too, so why don't you look at other sources?
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Unread postAuthor: starman » Mon Jan 19, 2009 12:11 am

rastamuffin wrote:you're a hater but the reason i came here is because i have no idea an id imagine that most people here do :roll:


No, Crowley is definitely not a "hater". He is however a moderator so you might want to watch your P's and Q's.

You have had some of the best and brightest here eagerly respond to your original post without any apparent thought progression on your part. That's what we're looking for from you. Take Crowley's advice and get on that research trail.
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Unread postAuthor: rastamuffin » Mon Jan 19, 2009 12:44 am

I have akready given my thanks multiple times to those wbho deserve it so take you Ps and Qs and quite honestly shove 'em
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Unread postAuthor: MrCrowley » Mon Jan 19, 2009 12:51 am

rastamuffin wrote:I have akready given my thanks multiple times to those wbho deserve it so take you Ps and Qs and quite honestly shove 'em

Coming out of retirement, I present to you...Facepalmheaddeskcombo:
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I now recommend every member to boycott 'rastamuffin'. Rastamuffin, all you had to do was read one single Wikipedia article, but you appear to be too lazy or arrogant for this simple, feeble task that a 10 year old could do. You didn't have to fully understand it, just read it.

Since you cannot be bothered reading, I don't think this is the hobby for you. You can try and look at all the pretty pictures to build your cannon, but i'm afraid it's just not that simple.

Have fun in life, goodluck with the spudguning and it's 40' performance. When I first read this topic, I was stumped at how a properly constructed cannon could only shoot 40'. I now realise the problem is not in the cannon itself, but the builder.

And you wonder why your cannon doesn't work when you can't be arsed to read a single page. Sure there is nothing stopping you from posting or other members from helping you as you are not worthy of a ban just yet, but you will no longer be getting help from me and your topics and posts will be added to my 'watchlist'. Ask any stupid questions, your post or topic will be deleted/locked.
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