Originally Posted by Vandad
I have been using automatic lifejackets and never had any problem with them even in the wettest environments etc.. As long as the lifejacket does not submerge into the water it will be fine. If it rains etc..
I'm afraid I have. Granted, it had a Halkey Roberts mechanism, these are fired by continued exposure to water, rather than water pressure as per the Hammar mechanisms.
The situation in question involved myself and poor auld donegaldan getting a right soaking from water over the bows. My Hammar jacket didn't deploy, his H-R jacket did.
That reminds me, I think Hammar mechanisms can "fail" to deploy if the wearer is floundering around on the surface (as in holding a rope or lying flat), they need a foot or so of water to create enough pressure. I may be wrong, again...