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Today I did do - Jam jar pulse jet!

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Blue_SV650S
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PostPosted: 23:20 - 07 Apr 2010    Post subject: Today I did do - Jam jar pulse jet! Reply with quote
Got the idea off youtube some time ago, and though it was cool ... for some reason I decided to give it a go (probably as I had a recently procured an empty hot-dog jar to try it with!! Smile).

To be honest, it wasn't all I hoped for ... I think the jar was too tall ...

but here is my attempt anyway ... it kinda worked for a very short burst ....

https://www.youtube.com/watch?v=XDCe9bzIhzo

Have a look on youtube for/at other people attempts ... it is pretty cool!! Cool

So, come on BCF, someone out there make a good one, take a vid and then post it up!! ... once we know the exact jar used, we can go out and get that same jar and try it ourselves!!! Smile

H&S brief - PLEASE, IF YOU DO TRY THIS, MAKE SURE YOU ARE WEARING SAFETY GOGGLES AND GLOVES as the glass can crack and the flame scorch Thumbs Up
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Last edited by Blue_SV650S on 23:38 - 07 Apr 2010; edited 1 time in total
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hellkat
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PostPosted: 23:35 - 07 Apr 2010    Post subject: Reply with quote
Is this what men do in their sheds?

(aside from wanking over the Pirelli calendar, obviously)
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Blue_SV650S
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PostPosted: 23:37 - 07 Apr 2010    Post subject: Reply with quote
hellkat wrote:
Is this what men do in their sheds?

(aside from wanking over the Pirelli calendar, obviously)


Go on, give it a go ... you might need a man to open the jar for you first though!! Wink
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TUG
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PostPosted: 23:39 - 07 Apr 2010    Post subject: Reply with quote
Would be good if i could see what the fuck is going on, i do love cameras but wish people would learn how to use them.
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MattHirst
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PostPosted: 15:58 - 08 Apr 2010    Post subject: Reply with quote
I think the idea of it being dark is so you can see what's going on (with the flamey jam far) Rolling Eyes

What else is there to see? A jam jar with a hole in the lid, put some meths in it and light it Confused
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Wafer_Thin_Ham
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PostPosted: 16:10 - 08 Apr 2010    Post subject: Reply with quote
MattHirst wrote:
I think the idea of it being dark is so you can see what's going on (with the flamey jam far) Rolling Eyes

What else is there to see? A jam jar with a hole in the lid, put some meths in it and light it Confused


https://www.youtube.com/watch?v=AePLpM5SnqE&feature=related

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Faldo
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PostPosted: 17:23 - 08 Apr 2010    Post subject: Reply with quote
Everyone knows the best homemade jets are made with turbochargers:

https://www.youtube.com/watch?v=l-spt7y1v6Y
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Blue_SV650S
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PostPosted: 17:57 - 08 Apr 2010    Post subject: Reply with quote
So is anyone else gonna give it a go?!? Cool
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Wafer_Thin_Ham
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PostPosted: 19:36 - 08 Apr 2010    Post subject: Reply with quote
Blue_SV650S wrote:
So is anyone else gonna give it a go?!? Cool


If I can find a suitable jar from work I'll give it a bash on Monday with some white spirit. Thumbs Up
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Blue_SV650S
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PostPosted: 19:42 - 08 Apr 2010    Post subject: Reply with quote
Big_Ham wrote:


If I can find a suitable jar from work I'll give it a bash on Monday with some white spirit. Thumbs Up


Does white spirit have enough oooomph!?!?! Thinking

The only ones I have seen have been run on either model fuel (nitro methanol), methylated spirit or pure alcohol ....
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Wafer_Thin_Ham
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PostPosted: 20:07 - 08 Apr 2010    Post subject: Reply with quote
Blue_SV650S wrote:

The only ones I have seen have been run on either model fuel (nitro methanol), methylated spirit or pure alcohol ....


Hmm, well white spirit's all I have kicking around in the garage, or diesel (which won't work obviously.)

Where can I get some meths from? Wickes or similar? I don't have any model fuel left after I sold my nitro buggy years ago.
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Blue_SV650S
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PostPosted: 20:16 - 08 Apr 2010    Post subject: Reply with quote
Big_Ham wrote:

Hmm, well white spirit's all I have kicking around in the garage, or diesel (which won't work obviously.)

Where can I get some meths from? Wickes or similar? I don't have any model fuel left after I sold my nitro buggy years ago.


Yeah, Wickes probably do meths, as will homebase/focus/B&Q Thumbs Up

You could always try a bit of petrol&white spirit mix??? Confused

Oh and I mean it when I say wear goggles and gloves ... even with gloves on I have burns on my hands ... the blast burn right through the glove in a nanno-second!! ... wouldn't like to think what it would be like with NO-gloves!! Shocked
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Wafer_Thin_Ham
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PostPosted: 20:24 - 08 Apr 2010    Post subject: Reply with quote
Blue_SV650S wrote:


Yeah, Wickes probably do meths, as will homebase/focus/B&Q Thumbs Up

You could always try a bit of petrol&white spirit mix??? Confused

Oh and I mean it when I say wear goggles and gloves ... even with gloves on I have burns on my hands ... the blast burn right through the glove in a nanno-second!! ... wouldn't like to think what it would be like with NO-gloves!! Shocked


Yes mum. Wink

Snowboarding gloves and Oakleys ftw. Cool
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Blue_SV650S
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PostPosted: 20:27 - 08 Apr 2010    Post subject: Reply with quote
Big_Ham wrote:

Yes mum. Wink

Snowboarding gloves and Oakleys ftw. Cool


You will ruin snowboarding gloves - have you not got any old leather bike gloves you can use?!!? Thumbs Up
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Wafer_Thin_Ham
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PostPosted: 20:32 - 08 Apr 2010    Post subject: Reply with quote
Blue_SV650S wrote:


You will ruin snowboarding gloves - have you not got any old leather bike gloves you can use?!!? Thumbs Up


Probably, I'll have a hunt around.

Having done a little research, I think your hole maybe too big, that's why it's not running well. They say that between 10-12mm is best for a really well running one. Thumbs Up

https://www.instructables.com/id/Be-an-Aeronautical-Scientist%3a-Make-your-Own-Jet-En/step3/What-goes-wrong/
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Blue_SV650S
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PostPosted: 20:54 - 08 Apr 2010    Post subject: Reply with quote
Big_Ham wrote:

Having done a little research, I think your hole maybe too big, that's why it's not running well. They say that between 10-12mm is best for a really well running one. Thumbs Up


I actually used a 9.5mm drill-bit!! Thumbs Up

I also tried putting a washer over the top to try and 'choke' it a bit ... but it blew straight off!! ... it is all good fun!! Laughing
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Wafer_Thin_Ham
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PostPosted: 20:57 - 08 Apr 2010    Post subject: Reply with quote
Blue_SV650S wrote:

I actually used a 9.5mm drill-bit!! Thumbs Up

I also tried putting a washer over the top to try and 'choke' it a bit ... but it blew straight off!! ... it is all good fun!! Laughing


Laughing

Shows what I know then. Tried making it bigger? Razz
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Blue_SV650S
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PostPosted: 21:04 - 08 Apr 2010    Post subject: Reply with quote
Big_Ham wrote:

Laughing

Shows what I know then. Tried making it bigger? Razz


Yep ... but didn't have a bigger bit (well other than a 10mm)

So I just 'enlarged the hole by wiggling the drill bit about ... this didn't improve the performance ... to be honest, I think having a perfectly circular hole might be quite critical to the whole thing?!!? Confused
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Wafer_Thin_Ham
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PostPosted: 21:07 - 08 Apr 2010    Post subject: Reply with quote
Blue_SV650S wrote:
to be honest, I think having a perfectly circular hole might be quite critical to the whole thing?!!? Confused


Hmm, I'm not sure. Some people seem to get decent ones by whacking a screw through the lid. I guess it could just be down to the luck of the draw.

Just buy loads of jars of hotdogs. Laughing
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Blue_SV650S
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PostPosted: 21:09 - 08 Apr 2010    Post subject: Reply with quote
Big_Ham wrote:


Just buy loads of jars of hotdogs. Laughing



{rubs belly} mmmmmmmmmmm hot dogs!!! Laughing
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