| should this be attempted? |
| yes! |
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54% |
[ 6 ] |
| hmmm the theory is good but some things should be added/changed |
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18% |
[ 2 ] |
| no |
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9% |
[ 1 ] |
| i have no clue what you mean! |
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18% |
[ 2 ] |
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| Total Votes : 11 |
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| Author |
Message
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| MaxuS |
 Posted: 11/30/2007 16:21 PM Post subject: |
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Sergeant Major
Joined: 02 Sep 2007
Posts: 199
119.81 Spud Bux
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| It would be worrying for me it my spudgun actually glowed brightly with heat, so how hot does it get? |
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| Tom |
| Posted: 12/01/2007 9:23 AM Post subject: |
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Sergeant Major
Joined: 24 Aug 2007
Posts: 188
69.64 Spud Bux
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I have seen them to, there is even a website how to buildt one(valveless pulsejet go-kart). But in my opinion they are too big, with a jet engine you would catch less air resistance
GR.Tom |
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| octane89 |
| Posted: 12/01/2007 11:54 AM Post subject: |
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1st Lieutenant
Joined: 11 Sep 2007
Posts: 273
224.26 Spud Bux
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| Id say draw up some ideas, post them here, see what people say, and do as you please. You seem to know about PJ's enough to trust yourself with this so give it a try with some sketches. |
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| jimmy101 |
| Posted: 12/01/2007 14:30 PM Post subject: |
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Major General
Joined: 28 Mar 2007
Posts: 1872
7932.61 Spud Bux
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I think it would be pretty tricky to get this to work.
Most valveless pulsejets (and, i assume, valved jets) cycle at a couple hundred times per second. Obviosly that is way too fast, for no other reason than it'll get too hot.
If you slow the ROF down to say one shot per second then you really don't have a "jet". Simply an auto cannon, one that refills with fresh air automatically.
You might be able to get the reed valves to work to automatically let fresh air into the chamber but the reeds will have to be substantially stronger than what is used in a reed valve jet. The jet operates at fairly low pressure, perhaps only a couple PSI above ambient. A spudgun is going to be hitting peak pressures of at least 50 PSIG. I would think the typical reed valves used in a jet would be trashed the first time there was a round in the barrel and the pressure rose high enough to actually launch the round. |
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| thespeedycicada |
| Posted: 12/13/2007 22:05 PM Post subject: |
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Lieutenant Colonel
Joined: 12 Aug 2007
Posts: 435
528.45 Spud Bux
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| No the valve will not be trashed they are made of steel that is thicker than soda cans and soda can burst discs blow at a higher temperature than a combustion will create. |
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| Novacastrian |
| Posted: 12/14/2007 0:28 AM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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| thespeedycicada wrote: | | No i have not used my jets in planes and probaly never will as these planes can reach 200+ mph! Besides my jets are valveless like the one below.The dynajet produces around 4 lbs of thrust and is about 1 lb or less in weight.I most likely will start this project tommorow but morre comments/suggestions will be appreciated the prototype will be pvc to test the theory.I also encourage some of you guys to get into pulse jetting its reallly addicting seeing a heavy tube get red hot in 15 seconds with enough noise to blow your eardrums.Ahhh the two of the most dangerous hobbies ever,spudding and pulsejetting. |
Sounds like just the thing i need to piss off my neighbours 
Not illegal and "Perfectly" safe! |
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