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Post by james1979 on Jan 21, 2023 12:45:23 GMT -8
In a previous thread the illustrious Dr. Frankenreg threw out an idea for a SH to DH conversion that looked like a prime candidate for 3d printed parts. I took that idea and ran with it, and consulted back for further ideas, and here is where it stands; Start with any generally barrel shaped 1st stage (this is done on a Conshelf VI or XI) and use an early screw on T 1085 second stage. Bolt the second to the first stage, block off the original exhaust spider, replace the faceplate with an exhaust horn/wagon wheel, and add a hoseloop. Design of printed parts:  Assembled and dry tested:    More testing is required, but looks promising. Venturi is nothing to write home about, but it functions! Set of parts will be going to Vance for testing and input. Respectfully, James |
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Post by artc on Jan 21, 2023 14:25:38 GMT -8
Hi James. The only word I have is “AWESOME.” And it’s also a balanced DH. Move over RAM. 👍
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Post by james1979 on Jan 21, 2023 14:49:32 GMT -8
Hi James. The only word I have is “AWESOME.” And it’s also a balanced DH. Move over RAM. 👍 Thanks, but credit for the concept goes to Vance.... I just happen to have the tooling for this one. I don't see it being anywhere close to RAM performance, but it ought to be fun. It could most likely benefit from an adjustable orifice inlet fitting..... |
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Post by scubalawyer on Jan 21, 2023 15:11:28 GMT -8
That is really cool!
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Post by nikeajax on Jan 21, 2023 16:22:11 GMT -8
OK, I see it now  I actually don't read very well, and if there's too much verbiage I can get totally lost: so when you guys were explaining it the first time I just had to give up  For some reason it's reminding me of the Viking/Norseman: www.vintagescubasupply.com/regsrare.htmlNice job, James: I can't wait to hear more about it! BTW, Joey and Dee Dee totally approve   JB |
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Post by vance on Jan 21, 2023 16:34:17 GMT -8
Maybe the second stage jetting needs to be reworked a bit? If not that, then maybe a more aggressive second stage like an MR12?
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Post by vance on Jan 21, 2023 16:49:49 GMT -8
OK, I see it now I actually don't read very well, and if there's too much verbiage I can get totally lost: so when you guys were explaining it the first time I just had to give up For some reason it's reminding me of the Viking/Norseman: www.vintagescubasupply.com/regsrare.htmlNice job, James: I can't wait to hear more about it! BTW, Joey and Dee Dee totally approve JB Since they are Joey and DeDe, I'd think "Well, they're against it!" |
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Post by james1979 on Jan 21, 2023 16:57:51 GMT -8
Maybe the second stage jetting needs to be reworked a bit? If not that maybe a more aggressive second stage like an MR12? MR12 might be doable, but part of this conversation is having a good way to mount the clamp to it. The older 1085 exhaust T screw holes serve well for that... The MR12 has the nice defined lip on the exhaust T flange that I could do a clamp around. I also have a couple mystery seconds that have screw on Ts. |
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Post by vance on Jan 21, 2023 17:15:19 GMT -8
Hi James. The only word I have is “AWESOME.” And it’s also a balanced DH. Move over RAM. 👍 Thanks, but credit for the concept goes to Vance.... I just happen to have the tooling for this one. I don't see it being anywhere close to RAM performance, but it ought to be fun. It could most likely benefit from an adjustable orifice inlet fitting..... It started with John's idea to use a remote first stage and to mod the second stage with a tee which would attach to the mouthpiece opening and carry a double hose loop. The exhaust would exit through the box as usual. The second stage would be chest mounted or mounted to the tank somehow. This idea is pretty different and I'm not particularly motivated to do what he proposed. I am very interested to see what he comes up with if he goes with it. Regardless, it led me to expand on the idea, but with a coupled first and second stage. I proposed the concept and James picked it up. It's pretty cool that all I have to do is write something like, "Maybe 3D printing could be useful here..." and I'll get a CAD drawing of the necessary parts in an email from James! I hope it is as much fun for him as it is for me! I don't think it will be, but this could prove to be a gigantic waste of time. Regardless, I really like to explore these alternative designs. |
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Post by nikeajax on Jan 21, 2023 17:52:46 GMT -8
Since they are Joey and DeDe, I'd think "Well, they're against it!" To bring that into context: Joey, singer and Dee Dee Ramone bassist... JB |
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Post by vance on Jan 21, 2023 18:06:08 GMT -8
Since they are Joey and DeDe, I'd think "Well, they're against it!" To bring that into context: Joey, singer and Dee Dee Ramone bassist... JB My late 70s and 80s experience. If you are with me, who is the only band that matters? The Ramones were good, but it's not them. |
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Post by luis on Jan 21, 2023 18:07:11 GMT -8
Nice work.
This is basically what Aqua Lung did with the design of the "New Mistral", but you actually did it using even more existing parts and just repurposing an already very decent design. The performance of your second stage is probably much better than the "New Mistral".
I think that I even like the looks better than the "New Mistral".
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Post by SeaRat on Jan 23, 2023 20:18:48 GMT -8
Thanks, but credit for the concept goes to Vance.... I just happen to have the tooling for this one. I don't see it being anywhere close to RAM performance, but it ought to be fun. It could most likely benefit from an adjustable orifice inlet fitting..... It started with John's idea to use a remote first stage and to mod the second stage with a tee which would attach to the mouthpiece opening and carry a double hose loop. The exhaust would exit through the box as usual. The second stage would be chest mounted or mounted to the tank somehow. This idea is pretty different and I'm not particularly motivated to do what he proposed. I am very interested to see what he comes up with if he goes with it. Regardless, it led me to expand on the idea, but with a coupled first and second stage. I proposed the concept and James picked it up. It's pretty cool that all I have to do is write something like, "Maybe 3D printing could be useful here..." and I'll get a CAD drawing of the necessary parts in an email from James! I hope it is as much fun for him as it is for me! I don't think it will be, but this could prove to be a gigantic waste of time. Regardless, I really like to explore these alternative designs. Thanks for the thoughts above. I’ve not yet figured out how to make a “Y” off the mouthpiece, and when I went to Home Depot, they did not have any ideas for me. I need a “Y” that will fit on the mouthpiece tube, then branch out with 1 inch openings for the hose/mouthpiece loop. I’m still sorting through ideas. John |
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Post by vance on Jan 23, 2023 20:57:44 GMT -8
PVC pipe is pretty easy to heat with a heat gun and form.
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Post by james1979 on Jan 28, 2023 6:59:22 GMT -8
It started with John's idea to use a remote first stage and to mod the second stage with a tee which would attach to the mouthpiece opening and carry a double hose loop. The exhaust would exit through the box as usual. The second stage would be chest mounted or mounted to the tank somehow. This idea is pretty different and I'm not particularly motivated to do what he proposed. I am very interested to see what he comes up with if he goes with it. Regardless, it led me to expand on the idea, but with a coupled first and second stage. I proposed the concept and James picked it up. It's pretty cool that all I have to do is write something like, "Maybe 3D printing could be useful here..." and I'll get a CAD drawing of the necessary parts in an email from James! I hope it is as much fun for him as it is for me! I don't think it will be, but this could prove to be a gigantic waste of time. Regardless, I really like to explore these alternative designs. Thanks for the thoughts above. I’ve not yet figured out how to make a “Y” off the mouthpiece, and when I went to Home Depot, they did not have any ideas for me. I need a “Y” that will fit on the mouthpiece tube, then branch out with 1 inch openings for the hose/mouthpiece loop. I’m still sorting through ideas. John Would something like this fit the bill?  |
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I actually don't read very well, and if there's too much verbiage I can get totally lost: so when you guys were explaining it the first time I just had to give up 
