Interesting thread.
For one, when hydroxy gas is generated, the surface it is generated from has an impact upon the gas at generation. So it is not simply a matter of the gas having to pass through CrO3 for conversion after generation.
If that surface has been prepared to be comprised of predominantly detrimental CrO3, then the hydrogen that evolves from that surface will be predominantly parahydrogen. This has been measured and verified.
If that surface has been prepared to be comprised of a predominantly beneficial material, then the hydrogen that evolves from that surface will be predominantly orthohydrogen. This has been measured and verified.
As you stated, hydrogen will seek equalibrium, so the ratio will change over time. The fresh gas is what we are interested in, as we do not intend to store the gas prior to use.
At the time of the HHO Games, I was not aware that there was a fairly simple lab procedure that could be used to measure the ratio of orthohydrogen to parahydrogen. That has since changed. Prior to me leaving florida, labs were just too expensive for me to pay for lab time myself, and Bob Potchen would not pay the price either.
The group I have been working with since then is doing all of the lab work required to prove out and document this technology. The results of their investment is their property, so it may be some time before they are ready to publish all of their findings, if they decide to do so. I have to clear each and every disclosure I intend to make, before I can.
Lab testing has also proven that it is the reactivity of orthohydrogen that is responsible for the increased combuston efficiency that we see in the combustion of complex hydrocarbon fuel chains. I suspected this for a very long time, and had confirmed for myself with gas quality vs performance testing. But I did not have scientific evidence to confirm it before. It made perfect sense to me, looking back on past research and experiments. Also, I can see that the results of the NASA hydrogen boosting study are a confirmation of this. The tank hydrogen used in that study was obtained from liquid hydrogen stores, and was still very low in orthohydrogen ratio. The hydrogen from the natural gas reformer contained a higher ratio of orthohydrogen. They could not explain the reason back then, as they did not know. But it was good that they included that information in the study. Interesting how the results of such an old study can be so important, once the importance of the variables involved are known.
Bob Boyce