when is a spinning rod and reel used
Fishing rod Spinning rods are made from graphite or fiberglass with a cork or PVC foam handle, and tend to be between 5 and 8.5 feet (1.5â€“2.6 m) in length. Typically, spinning rods have anywhere from 5-8 guides arranged along the underside of the rod to help control the line. The eyes decrease in size from the handle to the tip, with the one nearest the handle usually much larger than the rest to allow less friction as the coiled line comes off the reel, and to gather the very large loops of line that come off the spinning reel's spool. Unlike bait casting and spin casting reels, the spinning reel hangs beneath the rod rather than sitting on top, and is held in place with a sliding or locking reel seat.[18] The fisherman's second and third fingers straddle the "leg" of the reel where it is attached to the reel seat on the rod, and the weight of the reel hangs beneath the rod, which makes for a more comfortable way to fish for extended periods. This also allows the rod to be held in the fisherman's dominant hand (the handle on most modern spinning reels is reversible) which greatly increases control and nuance applied to the rod itself. Spinning rods and reels are widely used in fishing for popular North American sport fish including bass, trout, pike and walleye. Popular targets for spinning in the UK and European continent are pike, perch, eel and zander (walleye). Longer spinning rods with elongated grip handles for two-handed casting are frequently employed for saltwater or steelhead and salmon fishing. Spinning rods are also widely used for trolling and still fishing with live bait.
Helicopter The earliest references for vertical flight came from China. Since around 400 BC,[8] Chinese children have played with bamboo flying toys (or Chinese top).[9][10][11] This bamboo-copter is spun by rolling a stick attached to a rotor. The spinning creates lift, and the toy flies when released.[8] The 4th-century AD Daoist book Baopuzi by Ge Hong (抱朴子 "Master who Embraces Simplicity") reportedly describes some of the ideas inherent to rotary wing aircraft.[12]