Rutan Around...
NH3..good idea but not very efficient, is it?
Oz you have put up an excellent site. The idea of using Ammonia for energy storage is rapidly evolving. David Brown wrote your article in October this year and I have another of his written in early March this year. In that short time efficiencies have improved and many promising ways of making hydrogen and Ammonia using less energy input continue being researched in the labs.
If you haven't already done so the sites in the side bar under the heading 'Global Ammonia Energy Energy News' are interesting.
NH3 scores 100% for it's zero harmful emissions and is already on a par with round trip efficiency in some applications. With so much effort being applied I'm sure even greater efficiencies will soon be available.