Attachment 91191
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Sunday mashup
That last picture looks like an early hybrid electric vehicle conversion. At heavy loads the fan/generator is blowing to increase power from the gas engine but at cruise power it is using the power of the suck to run the fan/generator in the gen mode to help with electric drive motors.
The other option for that setup is to operate in the suck - generator mode 100% of the time to help drive the 5 gigawatt bass speakers.