A flying car able to widespread use should function acceptably within a closely populated urban surroundings. The raise and propulsion techniques should be quiet sufficient not to trigger a nuisance, and must not create excessive air pollution. For instance, air pollution emissions requirements for road autos must be met. In the air, a flying automobile will sometimes get hold of ahead thrust from a number of propellers or ducted fans. Jet engines usually are not used because of the floor hazard posed by the new, high-velocity exhaust stream.
You can find within the last two paragraphs of the introduction, the following, “The second category of consumable supplies consists of those materials that turn into part of the aircraft, engine or propeller. Example of these items can embrace hydraulic fluids, lubricating oils, greases, sealants, adhesives, room temperature vulcanizing silicone compounds, paints, lock-wire, and high temperature tapes. These supplies are all consumable gadgets that turn out to be a part of the plane, engine or propeller, and so they have been part of the kind certificated product when the FAA accredited the product. Skydrol would strip automotive paint right off the plane.