Originally Posted by
Downwind Lander
Slats11 says:
But nobody is talking about the CVR and FDR batteries. Surely none of my detractors think that these batteries are sufficient? I wonder if a power source can be devised using seawater as an electrolyte and dissimilar metals as electrodes.
There was a significant discussion on CVR/DFDR batteries several eons ago on this thread. Not only that but on the choice of frequency, the lack of modulation of the ping with an aircraft ID or last GPS position, and power increases by reduction of the number of pings or by using transponder techniques.
It seems that the CVR/DFDR spec for locator beacons was for finding the recorders in a river or lake. The expansion of transoceanic flight passed by the people setting the requirements until AF447. Now they are belatedly increasing the battery capacity but other 'bright ideas' have not been taken up.