Posted 09 February 2007 - 10:05 PM
Bill,I fear my earlier response reflects some jet lag which I need to clarify. Each 18° tick mark on the Ship Turn Indicator is equivalent to a cost of 2 Kts as described in Section 1.2.3 on page 1-2. Thus, the first tick costs 2 Kts, the second (36°) costs 4 Kts, etc. As a ship leans into a continued turn, lateral resistance increases, costing more "Kts" worth of movement energy. The more she turns, the greater the "cost" of this resistance. In the interest of simplicity, this is reflected as a constant 2 Kts/18° on the Ship Turn Indicator. By allowing minor turns of < 30° to be made without measuring with the Ship Turn Indicator, movement is made easier and captains can, in effect, execute these minor changes in course without extra cost at the normal one Kt/1oo yds due to minor lateral resistance as noted in my earlier reply. For turns > 30°, the cumulative cost is simulated at a cost of 2 Kts/tick. Thus, a two tick turn (36°) costs 4 Kts, etc.Not quite sure I understand what you mean by your variants. Seems your variant 2 is what I've described. I'm not sure what number 3, the bold variant, means either, but I agree the cumulative cost is similar. If I haven't answered your question, take another shot. The intent is simply to simulate that significant course changes cost movement due to lateral resistance and hull slewing in the waves, in a quick, easy way without getting into the complex physics of movement in a liquid medium. I will look forward to your upload as the draft version of your movement gage that I have seen contains some nice, innovative aids to define movement in different situations. Well Done!