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Post by phoenixsilver on Jun 2, 2023 6:14:55 GMT -5
Tapping a thread in a piece of bar might be a good way to do it. Although the nozzle racket linked is interesting, they don't seem to be commonplace in the UK, but are available in the US/AU. Fortunately I know someone travelling to the US shortly so I may ask them to bring this back with them to avoid the crazy £25 shipping fee for a £6 adapter!
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Post by andym on Jun 5, 2023 16:33:50 GMT -5
Tapping a thread in a piece of bar might be a good way to do it. Although the nozzle racket linked is interesting, they don't seem to be commonplace in the UK, but are available in the US/AU. Fortunately I know someone travelling to the US shortly so I may ask them to bring this back with them to avoid the crazy £25 shipping fee for a £6 adapter! You can get the 9/16"-24 TPI tap on ebay.... for £8.63 inc postage..... |
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Post by phoenixsilver on Jun 6, 2023 6:02:09 GMT -5
Would need to get the T handle as well but it's a good investment so I'll likely go with that  |
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Post by andym on Jun 6, 2023 9:54:31 GMT -5
Would need to get the T handle as well but it's a good investment so I'll likely go with that Hi, if your looking to build a jet engine.... kart maybe.... you should i think be looking for a tap and die set.... us pro do some goods at not much money |
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Post by phoenixsilver on Jul 16, 2023 16:10:58 GMT -5
Having got all the parts together now that I have free time, I'm now making the first bits, like the frame to hold everything (learning welding, I have some more box section on order!) and the combustion chamber. I am using a 9L water fire extinguisher for this purpose - it is a little shorter than the 444mm jetspecs wants, however I figure that 3-4cm less isn't too significant. Inside the combustion chamber I'll be using 6 inch diameter stainless steel pipe. I've seen some posts on here suggesting that the layout of holes is a little more complicated when using liquid fuel like I am so I'd be curious for any tips on placement. The JATO document that explains everything suggests hole sizes of 1/4', 3/8', 5/8' respectively for a larger sized turbo like mine. Is this OK or should I change anything?   |
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Post by racket on Jul 16, 2023 17:21:47 GMT -5
I'd go up a size for your primary hole , maybe 8 mm , 10mm and 15mm or imperial alternatives 5/16 , 3/8 and 5/8
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Post by phoenixsilver on Jul 18, 2023 10:25:33 GMT -5
Sounds good. I'm also going to see if I can repurpose the end of the fire extinguisher "dome" top that I cut off to make the connection to the turbine scroll a little more "gradual" rather than an abrupt end. Can I just suspend the flame tube and have it sit "freely" in between a couple of end rings? I assume best practice would be to weld it to one of the end rings or the end cap. In terms of the flame tube length, does it need to be pressing up against the end of the combustion chamber as I've shown in Option 2, or can there be a small gap like option 1 (nothing to scale)? If option 2, and it has to be airtight against the end, then I could perhaps weld it to there?  |
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Post by racket on Jul 18, 2023 17:07:46 GMT -5
All air needs to go through the flametube wall holes
Don't fit the air delivery tube to the Primary Zone end of the combustor , it it to the "bottom"of the comnbustor so that the incoming air doesn't disturb the flame .
No sharp edges at the outlet of the flametube , a tapered transition from the flametube cross section to the turbine scroll inlet otherwise theres problems .
Look through the various build threads and find a "successful" one and copy it.
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