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View Full Version : Garspeed does the JJ Thang (part trois)



Garspeed
10-04-2017, 10:43 AM
Okay, so it has been a long time coming but here goes. Let me start by saying sorry to the JJ masses who think that this unit is perfect, please don't seek me out and string me up!

I have been diving the JJ for just shy of one year now and having come from an AP unit think that the engineering is beautiful. That said, she is far from perfect and amongst my pet hates / annoyances are as follows...

- threads to engage scrubber to head are crap and continually cross mesh
- head engagement into can is not great, in fact it can be a ball ache to install and remove
- wet contacts on both hud and handset are a pain (new version units have fix I believe but this cannot be upgraded in old ones)
- inhale lung cannot easily be cleaned
- cannot fit suit inflate bigger than 1 litre onto backplate due to RMCL's becoming obstructed
- no matter what the fashion police tell you, RMCL's will never breath as good as TOS due to static imbalance

So the majority of above I can do nothing to fix, but the last few issues relating to the lungs, hmm! As some of you may know, I have experimented with Inspo lung builds for several years now and have made RMCL's, TOS and hybrids. Looking at the JJ issues the obvious solution to many of my issues was to build my own TOS lungs. If done to fit from top of backplate to front d rings then this should allow 1.5 litre alloy suit inflate onto backplate, torch battery on opposite side, if extra dump is added then I can clean both lungs easily, simples!

So with plan set I got out the pen and started doodling. I also got out the calculator and started working out lung volumes that seemed more appropriate to my size. The results of my efforts are shown below...

New inner bags with existing holes sealed up and new ones made on opposite side

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1359_zpsmufm2y6x.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1359_zpsmufm2y6x.jpg.html)


New outer bags

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1354_zpssqeujo6a.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1354_zpssqeujo6a.jpg.html)


http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1353_zpsxl92jril.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1353_zpsxl92jril.jpg.html)


Completed build on new lungs (note dumps now on inhale and exhale lungs)

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1366_zpsc0a8adpc.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1366_zpsc0a8adpc.jpg.html)


Hope you like the lungs, I have more photo's to upload on how they fit onto harness and how harness and lungs fit onto unit but for some reason my host program is not playing ball. I will try again later and add to this thread with more photo's if possible.

For info, two test dives completed this weekend in quarry to 22m and lungs were perfect. No issues with ADV firing early, or dump valves releasing prematurely so volume of outer bag seems good. Also attempted off loop bailout in both head up and horizontal positions and found that the lungs self vented on ascent each time with no loss of buoyancy control ie I can surface safely without having to manually pull strings to dump loop. So far so good, but real test will be deep dive once weather improves. That said, on route home from last quarry dive my buddy and I skirted around a shallow ledge at 3-4m deep which is already a pretty good test of buoyancy control!

Garspeed
10-04-2017, 11:02 AM
Fixing lungs to harness (using bungee to allow some flex and prevent bags ripping!)

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1400_zpsql5nvtdm.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1400_zpsql5nvtdm.jpg.html)

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1399_zpsylgn7dh3.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1399_zpsylgn7dh3.jpg.html)

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1427_zps7mw3vx9j.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1427_zps7mw3vx9j.jpg.html)


Lungs / Harness in Situ (on some random grumpy guy!)

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1419_zpscpugn92o.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1419_zpscpugn92o.jpg.html)

Finished item

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1373_zpsqquxgwvz.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1373_zpsqquxgwvz.jpg.html)

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/IMG_1460_zps6ehmlumu.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/IMG_1460_zps6ehmlumu.jpg.html)

Garspeed
10-04-2017, 01:15 PM
As my good buddy Grebo stated recently, I have spent years making an Inspo look like a JJ and now that I have a JJ, what do I do...

Grebo
10-04-2017, 01:58 PM
As my good buddy Grebo stated recently, I have spent years making an Inspo look like a JJ and now that I have a JJ, what do I do...


Nothing a bit of yellow paint can't sort out ;-)

BjFaeTorphins
11-04-2017, 08:33 PM
The JJ massive appear to have been stunned into silence by your audacity to try to improve it Gar. Fettle on!

Sent from my Nexus 9 using Tapatalk

Garspeed
12-04-2017, 06:40 AM
The JJ massive appear to have been stunned into silence by your audacity to try to improve it Gar. Fettle on!

Sent from my Nexus 9 using Tapatalk

Not too sure about that BJB! Thx for your standby duties in the quarry on the day, look forward to checking out the GoPro video to see how all looks in operation, suit inflate and torch battery placements now much improved from previous so bring on round two!

Garspeed
17-04-2017, 11:12 AM
Another picture of unit as dived this Easter weekend...

http://i1352.photobucket.com/albums/q658/Garspeed/JJ%20TOS%20Lungs/JJ_zpsjzhzebmx.jpg (http://s1352.photobucket.com/user/Garspeed/media/JJ%20TOS%20Lungs/JJ_zpsjzhzebmx.jpg.html)

All working great with suit inflate and torch now sorted on back plate as they should be

PS - still have set of TOS Inspo lungs (similar style to above) available for sale if anyone interested

MikeF
17-04-2017, 11:45 AM
All working great with suit inflate and torch now sorted on back plate as they should be


never hung a torch on a backplate in my life, I prefer it my hand so I can point it wherever I want some light....

Phate
17-04-2017, 11:46 AM
I don't understand everything being posted. But it's fasinaing all the same. Please keep going! :)

cathal
17-04-2017, 12:15 PM
Interesting to see how the WOB is at depth.

Garspeed
18-04-2017, 06:42 AM
Interesting to see how the WOB is at depth.

Based on hydrostatic balance it will be better than standard, the TOS Inspo lungs I made were dived from 5m to 75m and were great. Also the smaller volume better tuned to the size of my lungs helps with minimum loop as it limits the amount of gas you can add to the lungs (which are made for your "average" person!)

WFO
18-04-2017, 08:06 AM
They look great.

Like the idea of the self dumping on a bailout ascent. Considering putting some restriction on the outer bag size on my homebuild to give the same effect as there is lots of volume there over and above mlv.

WFO
23-04-2017, 12:07 PM
Any chance of some more detail on how you mount your suit bottle? Mines in a loop of webbing with some bungee round the neck (valve down)

Problem I have is the edge of the backplate knocks fk out of the bottle.

No major issue really but not sure how much gouging is acceptable with 200 bar in there.

MikeF
23-04-2017, 12:27 PM
Based on hydrostatic balance it will be better than standard, the TOS Inspo lungs I made were dived from 5m to 75m and were great. Also the smaller volume better tuned to the size of my lungs helps with minimum loop as it limits the amount of gas you can add to the lungs (which are made for your "average" person!)

surely that all depends on whether your lying flat in 'perfect flat trim' or constantly standing upright and gazing about looking to see were your buddy has got to now.

matt
23-04-2017, 03:12 PM
Nice one Gar. Always knew it wasn't perfect ;-)

Matt.

Doomanic
23-04-2017, 04:35 PM
Okay, so it has been a long time coming but here goes. Let me start by saying sorry to the JJ masses who think that this unit is perfect, please don't seek me out and string me up!

I have been diving the JJ for just shy of one year now and having come from an AP unit think that the engineering is beautiful. That said, she is far from perfect and amongst my pet hates / annoyances are as follows...

Nice one Gar. Always knew it wasn't perfect ;-)

Matt.

The JJOC would like to have a word with the pair of you...

http://4.bp.blogspot.com/_PvaC8eRNFWc/THmIg18NFyI/AAAAAAAAA88/R6uCYU4ifQ8/s1600/Simpsons+Movie+Angry+Mob.jpg

Garspeed
24-04-2017, 11:24 AM
Any chance of some more detail on how you mount your suit bottle? Mines in a loop of webbing with some bungee round the neck (valve down)

Problem I have is the edge of the backplate knocks fk out of the bottle.

No major issue really but not sure how much gouging is acceptable with 200 bar in there.

Always done same but this time round I have a loop of webbing at either end of suit inflate cylinder (before neck taper) so it therefore sits in two loops with same bungee round neck to stop it slipping out. Seems to support it better, keep it parallel and away from bashing neck off of back plate and limit the slippage on the bungee (sorry, no photo handy!)