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2. Roof rack - Wikipedia

   en.wikipedia.org/wiki/Roof_rack

   Roof racks increase air resistance and in the US, roof racks increased overall fuel consumption by approximately 1%. [6] Due to greater wind resistance, roof racks may increase wind noise on the highway. Mounting the roof rack backward may reduce air resistance. [7] Some bars are designed with a lower drag coefficient or have a wind deflector ...

3. Loading gauge - Wikipedia

   en.wikipedia.org/wiki/Loading_gauge

   Cars in the former IRT system are 51 feet (15.54 m) as of December 2013. Railcars in the former BMT and IND can be longer: on the former Eastern Division , the cars are limited to 60 feet (18.29 m), while on the rest of the BMT and IND lines plus the Staten Island Railway (which uses modified IND stock) the cars may be as long as 75 feet (22.86 m).

4. Photovoltaic mounting system - Wikipedia

   en.wikipedia.org/wiki/Photovoltaic_mounting_system

   [11] [12] In general, ground mounted PV systems can be at the optimal tilt angle and orientation (as compared to roof mounted systems that can be non-optimal particularly for retrofits). Ground-based mounting supports include: Pole mounts, which are driven directly into the ground or embedded in concrete.

5. Bracket (architecture) - Wikipedia

   en.wikipedia.org/wiki/Bracket_(architecture)

   In adjustable shelving systems, the bracket may be in two parts, with the load-bearing horizontal support fitting into a wall-mounted slotted vertical metal strip. Brackets also are an element in the systems used to mount modern facade cladding systems onto the outside of contemporary buildings, as well as interior panels.

6. Spoiler (car) - Wikipedia

   en.wikipedia.org/wiki/Spoiler_(car)

   Some modern race cars employ a passive situational spoiler called a roof flap. The body of the car is designed to generate downforce while driving forward. These roof flaps deploy when the car's body is rotated to travel in reverse, a condition where the body generates lift instead.

7. Universal joint - Wikipedia

   en.wikipedia.org/wiki/Universal_joint

   One anticipation of the universal joint was its use by the ancient Greeks on ballistae. [2] In Europe the universal joint is often called the Cardano joint (and a drive shaft that uses the joints, a Cardan shaft), after the 16th century Italian mathematician, Gerolamo Cardano, who was an early writer on gimbals, although his writings mentioned ...