Well, good for you, for dreaming and thinking, we all do that, and always good to see others do it.
I wish I had the link for the fuel cell motorcycle. It was not noisy, and not smelly. The output was only water vapor. It was also extremely quick off the line, so much so, they had to slow down the electric motors so the test drivers would not hurt themselves.
One of these days, if sanity ever prevails, every other form of energy will be converted to hydrogen. Astonishinly, even people like Sen. McCain have not made the connection between the dozens of new nuclear plants he wants to build, and the ability to manufature fuel, no just supplent the electric grid.
In this, the Stirling engine, or some new variation of the externally heated heat engine, will be of value beyond description. This is because it will allow many unconventional sources of energy to be used to make hydrogen.
The original Stirling was motivated by the need to build replacements to the steam engine, because the steam engine was just too dangerous. Ironically, nuclear power is too dangerous mostly because they use a big steam engine. Both Three Mile Island close call and Chernobyl were steam and water mishaps.
A dry nuclear design that could get through red tape in less than several decades using Stirling technology built not close enough to run copper wires, but far out in a geologic stable out back, to make hydrogen would solve a lot of problems.
Then you could ride your fuel cell bike all you want!
Alas .. nobody running for politcal office this year has a clue.
They all know we have to use many sources of energy.
But don't know how to do that.
Al Gore knows we need a big infrastructure change.
But doesn't know what.
And there, in the palm of your hand, literally, runs a Stirling engine, the little engine that could, saying
"shine upon me the sun,
warm me with the earth,
let me swim at the surface of the ocean,
and reach into the cold depths,
build me a clean way to burn coal,
use me with natural gas you have so much,
I care not how you warm me,
and I will give you back a clean planet,
raise more food than you can eat,
and let you do things you would not even dream of now"
but all we have to choose from is Tweedle Gee and Tweelde Frum.