Robert Clark wrote:

Don Lancaster wrote:

You have to recognize that converting water vapor to liquid consumes
energy and has to be charged against the fuel cell efficiency budget.

Batteries are almost certainly more cost effective.

http://www.tinaja.com/glib/energfun.pdf

Batteries would not give you *liquid* water while carrying 1/8th the
weight of the water in fuel. That's an important part of my
application.

You specifically need/want the water ?

I liked the liquid N2 idea for the condensor btw. Dry Ice would be another
possible and easier to handle.

Graham