Today a small airplane is towing an advertising banner, about 20 by 30 feet, in a circular path around my town's university campus. The banner stays tilted about 45 degrees to make it easier to read by those whom the airplane is circling. Winds are 10 knots gusting to 20, if that matters.
How can it maintain that tilt? Surely the tether can't exert a torque on the banner.
Websites of companies such as Van Wagner Aerial Media and Airplane Banners Nationwide say they can do this, but without explanation:
Each advertisement will be tilted, with your choice between zero and 90 degrees, towards your audience.