antique diver wrote: ↑Wed Sep 20, 2023 2:17 pmI recently acquired the makings of Bendix Lung conversion #3. Doesn't look like much in this photo, but I have hopes for it to be a good one. It will be a "back to the basics" diving lung, utilizing the slightly modified/simplified internal first stage. More photos soon, when it starts to look recognizeable.
Here's the #3 with all the all the important inhalation adjustments in working condition at 1000 psi tank pressure. The cracking pressure of 0.4" of water column is shown on the Magnehelic. It can be adjusted to lower effort, but may get a bit out of control in actual use. I'll have to experiment with that when I take it diving. It stays very close to same at all usable pressures, but gets slightly lower at 300 psi due to upstream second stage. I haven't decided on the exhalation side configuration yet, but that will be the next to dream up.
Breathing effort stays comfortably low as shown in the following video clip. It can adjust lower by removing a short restriction tube that easily unscrewed and removed with the inhalation hose disconnected. Diaphragm cover is removed to show it in action with normal to fairly heavy inhalations.
I didn't have luck trying to get directly to the 9 second video, but it is accessible with this link: