John build his own LAR rebreather using parts from RG/UFM and homebuild parts.
Intermezzo: John built a rebreather with passive addition. This means that oxygen is added when the counter lung becomes empty. LAR stands for Lungen Automatic Rebreather, which means lung automatic rebreather.
The unit has the same functional princples. It is based on a demand system and can be bypassed manually. For the oxygen addition the CL is mounted on a demand regulator thas has been found in a scubapro second stage. To prevent the counterlung form collapsing it is equipped with a stainless spring. A nice and simple design.
The counterlung is made of plastic but will be replaced by ortlieb waterbag of 10 liter.
Moutpiece and hoses are from DDR RG/UFM and the scrubber is made in PVC
In the center you see the manual bypass. It is operated by pressing the membrane. The membrane adds the passive addition function.
The membrane and lever are build in a polyamid housing (build by John)
Inside the unit without the counterlung
This part is build very solid
John, thank you very much sharing this info with us
Therebreathersite was founded by Jan Willem Bech in 1999. After a diving career of many years, he decided to start technical diving in 1999. He immediately noticed that at that time there was almost no website that contained the history of closed breathing systems. The start for the website led to a huge collection that offered about 1,300 pages of information until 2019. In 2019, a fresh start was made with the website now freely available online for everyone. Therebreathersite is a source of information for divers, researchers, technicians and students. I hope you enjoy browsing the content!