Plate compactors fall into one of three categories: single plate compactors that move in only a forward direction, reversible which move in forward and reverse, and high performance/heavy-duty plate compactors. The handle of a plate compactor plays a key roll. It can be mounted in the center or back of the unit. It can be a swinging handle allowing for easier maneuverability. And it could also be an anti-vibration hadle for increased operator comfort. Equipment is a key element in paving and pavement maintenance.
When hovering, hummingbirds hold their bodies upright and flap their wings horizontally in a shallow figure-8. As the wings swing back they tilt flat for a moment before the wings are drawn. Most hummingbirds flap their wings about 50 or so times a second.
Sent in by William S. Blackwell, Bedworth, Warwickshire. The peregrine falcon is arguably the fastest bird in the sky. Its streamlined body, powerful muscles and swept-back wing shape are perfect for fast flight. During level flight, with motion generated by wing-beats alone, they can reach speeds between 40-60 mph.This is one of the fastest known speeds for level flight with only a few species of duck, wader and pigeon known to reach similar speeds in comparable flight.uring level flight, with motion generated by wing-beats alone, they can reach speeds between 40-60 mph. This is one of the fastest known speeds for level flight with only a few species of duck, wader and pigeon known to reach similar speeds in comparable flight.