dennis@home wrote:

Well they aren't doing it by wind power driving the wheels

They claim to be doing the opposite, driving the propeller from the wheels.

when they get to an effective zero wind speed, which they must do.
It has to be done by storing energy or the whole thing is just a
joke/fraud.

The specific record the NALSA were overseeing does seem *so* tightly
defined and measured as an average over just a 10 second period, that
momentum of the rotating bits might account for it.

During most of the runs they give it a push start, but they do also have
some videos showing that it can get up to the push-start speed just from
the prevailing wind (it's not exactly fast off the line).

An easier claim to "sell" to Joe Public would be over a longer period,
i.e. let it start from zero on the line and reach a final speed that's
faster than the average (or even better the peak) wind speed over the
course.

They can't even claim its the sails (turbine) crossing the
wind like a land yacht as its completely different.
In fact once they pass the wind speed the turbine should reverse as the
wind flow has reversed. I notice it didn't.

They have a picture showing a flag on land blowing in one direction with
the wind, while a streamer on their vehicle blows the opposite way as it
travels past ...