38:07

I Found the Most Efficient Propeller Design - Competition Ep. 3

25:50

I Built a Powerful R/C Tow Boat

30:09

I made a precision gearbox - with NO GEARS.

29:54

Unboxing my $1,000 ELECTRIC boat from China

26:17

Battling 200 RC Airplanes With a Giant Flying Ceiling Fan

24:19

Make Your Own Air Knife!

34:54

I Saved an Electron Microscope from the Trash

31:07

I Built a Mini Truck for Abandoned Railroads