I read this investor letter twice. It seems to me, the reason focus was changed toward stationary engines, is that the variable parameters under which the fleet tests were done showed a need for adjust on the fly  in amperage. Now that we are testing a stationary motor, obviously draw changes as the load changes and this is cited as a problem. What has changed and I thought the new version was improved to compensate for this? What am I missing? Long and less strong, HLNT.