Identify features of the economic business cycle. 1  Business cycles are identified as having four distinct phases: expansion, peak, contraction, and trough.  Business cycle fluctuations occur around a long-term growth trend and are usually measured by considering the growth rate of real gross domestic product.
Abstract: Rate of turn indicator for a nautical vessel, aircraft and the like indicating the rate of turn or swing in units such as degrees per unit of time from a particular course of travel.. Field of the Invention. The present invention relates to a navigational aid or nautical instrument, and more particularly, pertains to a rate of turn indicator for indicating the rate of turn from a course of travel for a vessel or other like vehicle.
If this is a 2008 Mercury 4-Stroke 50HP then the gear ratio is 1.83:1 - meaning the crankshaft has to turn 1.83 times to turn the prop 1 time. Knowing this you can calculate the RPMs of the prop at any engine RPM range. With the engine turning 5,500 RPMs the prop would be turning a little over 3,005 RPMs (5,500 / 1.83 = 3005.46). With this calculation and a few other figures you can calculate how fast the boat should run with a certain pitch prop at a certain RPM and if you have a GPS you can calculate how much the prop is slipping at a certain RPM.