Discussion on Stirling or "hot air" engines (all types)
Saw that program. One very important thing they have not address is the charging time. As a matter of fact, they never mentioned it, which I think is the biggest issue facing electric cars. The range issue can be solved by building more charging stations IF charging time can be reduced to a few minutes like fueling up the tank with gasoline.A professor has that solved and he demonstrated it. Just needs development money to mass produce. It also produces more power as it can be a lithium metal battery rather than lithium ion.
Back to the thread premise; I pretty much agree with this paper:
That's the paper I sighted. For all intend and purposes, the authors did not use a efficient burner for the study. The nasal report indicated the mod ii had an over all efficiency of more than 36% which I think is pretty good.