Sunday, April 13, 2014 at 6:45PM. Generations of southerners have welcomed Chinese snowball viburnum, Viburnum macrocephalum 'Sterile', into their gardens. With multitudes of flower clusters up to eight inches across, this classic shrub is a thing of beauty when it blooms.
Stroke refers to how the pistons move in the cylinder(s). The basic meaning is the length of the piston travel. Short stroke engines can turn over faster, but long stroke engi â¦ nes tend to have more pulling power. Stroke can also be used as 2-stroke and 4-stroke, which refers to the different work phases of the engine.
Front crawl is fastest official racing stroke. I don't know exactly why, in terms of detailed physics, but basically the arm recovery is through the air. So the arm can quickly return to the pulling part of the stroke. Air has less resistance than water, so the more parts of your body that are out of the water, the better. Another factor that makes front crawl faster is that breathing is done by turning the head to the side to take a sip of air.