re: OB/boat related: Any Elec Engineers or solar power experts on the OB?

Houston, MS High School owns most of the records in solar car racing in whatever division they race in.

You can find some useful info about solar power for the cars at the link below. You would have to figure out transferring the power to a propeller.

LINK

The Houston, Mississippi (population 4,079) Sundancer solar car team won the Dell-Winston School Solar Car Challenge open division championship trophy at Texas Motor Speedway for the sixth consecutive year. During the challenge’s four days and seven racing periods of three hours each, the Sundancer solar car traveled more than 619 miles (413 laps), at an averaged a speed of almost 30 mph, reached a top speed of approximately 60 mph and completed more laps than any of the 13 other cars competing in the race.