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how you do attach PC to the chamber?

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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how you do attach PC to the chamber?

Unread postAuthor: bighead33 » Fri Mar 19, 2010 12:44 am

how do you attach PC to the chamber?

SP: i all ready read burntlatke and the spud files wiki but i want to know how you do it.
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Unread postAuthor: MrCrowley » Fri Mar 19, 2010 12:51 am

I'm sorry but what does PC mean? Perhaps I've forgotten but it isn't ringing any bells at the moment.
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Unread postAuthor: Lentamentalisk » Fri Mar 19, 2010 1:08 am

I am suspecting that he is talking about the computer, with which they recorded pressure, or speed, or something like that.

It requires special sensors, and data acquisition software. Both are very expensive to buy, but if you don't care too much about quality, you can make them yourself for pretty cheap.
Granted, if you don't know how to do it just by looking at the photos, it is WAY beyond your league at the moment.
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Unread postAuthor: chinnerz » Fri Mar 19, 2010 3:38 am

im with SirCrowley, some more explanation is required
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Unread postAuthor: MrCrowley » Fri Mar 19, 2010 3:49 am

I'm struggling to find examples of using a computer on a spudgun except for the homemade chrony's, digital gauges etc...
I'm curious as to what he means.
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Unread postAuthor: Crna Legija » Fri Mar 19, 2010 4:02 am

You will need some polyepoxide
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Last edited by Crna Legija on Fri Mar 19, 2010 6:06 am, edited 1 time in total.
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Unread postAuthor: POLAND_SPUD » Fri Mar 19, 2010 5:04 am

uhmm maybe he meant 'propane cylinder'
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Unread postAuthor: MrCrowley » Fri Mar 19, 2010 5:36 am

Well you can't honestly blame us for that one :P

Hose clamps, most people use.
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Unread postAuthor: Hubb » Fri Mar 19, 2010 7:37 am

He may be referring to the PC fan. If that's the case, you need to read just a little bit longer.
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Unread postAuthor: D_Hall » Fri Mar 19, 2010 11:30 am

Lentamentalisk wrote:It requires special sensors, and data acquisition software. Both are very expensive to buy, but if you don't care too much about quality, you can make them yourself for pretty cheap.

To be fair, there's nothing particularly special about the sensors but you're quite right that it can be very expensive or pretty cheap.

On the expensive side, Vera has 3 GP50 pressure gages ($1k-$2k ea.). The data is recorded by a Genesis (no idea how $$, but very). And of course, between those two points are various signal conditioning amplifiers and such. Note that this is professional level stuff. The data will be as good as anything available anywhere...but it ought to be given what it costs!

On the cheap side. Jimmy has done some pretty impressive stuff using nothing more than piezo capacitive sensors (a couple bucks?) and a sound card (already in your computer). The upside of piezo capacitive sensors? They're CHEAP. They have very fast response times. The downsides of them? They tend to be very innacurrate and they drift badly with temperature fluctuations (which WILL happen in a combustion).

As with so many things... You need to decide what you're REALLY trying to accomplish and what you can afford before you decide what instrumentation is "right" for you.
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Unread postAuthor: bighead33 » Fri Mar 19, 2010 12:22 pm

i am so sory for the mix up but hubb is right i do mean pc fan. must have left out fan part :oops:
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Unread postAuthor: Hubb » Fri Mar 19, 2010 12:57 pm

On my last combustion launcher, I mounted my fan like this.
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Unread postAuthor: mark.f » Fri Mar 19, 2010 4:45 pm

What size is your fan (commonly, they come in 120, 80, 60mm sizes), and what size is your chamber?

If they are relatively close, I usually just wrap mine in tape until they fit snugly into the back of the chamber.

You can also use fans other than computer fans. I like cheapo fans from walmart...

Image

Older version... haven't seen these fans in a while

I usually connect them with threaded rod or machine screws. Also note that the blue fan needs to be un-bolted from the chamber to change the batteries. :oops:
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