I found this on the
US Dept of Energy's website.
NB the URL to the link:
https://www.energy.gov
I have posted the 1st couple of pages below.
Here's the link to the complete presentation;
https://www.energy.gov/sites/prod/fi..._17_fenske.pdf
Parasitic Energy Losses
Here is another link
showing a test engine used in these experiments etc;
https://www.energy.gov/sites/prod/fi...t08_fenske.pdf