Hi I am wondering if someone can help with design for the top swivel arrangement to have a light aeroplane on top acting as a windvane, I need to keep the resistance as low as possible, I imagine having 8 inch or so pole in concrete in the ground or bolted down to a concrete base but need to work out the top, many Gas stations have a rotating sign but is motor driven, mine will rotate in the wind obviously, any advice or drawings would be great
Thanks
Philip