I would like to take this opportunity to illustrate to you my friend that new members almost never look at old posts to see if a question has been discussed. Am not saying unkeptsoul40 is like that but the vast bulk do. Notice there are many topics debating the same subject, 2 or 3 on the switch theory etc. Could we please look at older threads please and see if your question is answered. Case in point if I wanted to find the answer to this thread I would look at the 'what if she hit head on', because common since dictates the ships speed and turning rate may be discussed there. Thank you