Confederation Marine Modellers

          Well, they say that you can’t teach an old dog new tricks, and looking around our meeting room at our October membership meeting, new tricks might be more of a challenge than anyone could imagine.
          However, we are going to try a number of new things over the next few meetings, and the Executive would love to hear your feedback as to whether we are moving in a direction that you are happy with, or might have some other ideas as well.
          We are going to severely curtail the business portion of the meeting, unless a member wished to discuss something contained in the meeting planner. We will continue to be as transparent as possible with past events, upcoming events, club initiatives, etc., but will focus much more on membership interaction. That transparency will be achieved through the meeting planner, which will provide as much detail as possible on club activities.
          Replacing the long winded business portion of the meeting, we are planning to have the members themselves provide a large part of the evening’s activity. To that end, we plan to have three members present their work each month to the members in attendance, so if you want to see some great looking models, you had better plan to attend the meetings! When we have an outside presenter attend one of our meetings, we plan to have them speak at the beginning of the meeting wherever practical.
          We hope this format change will meet the approval of the members, and we certainly would appreciate your feedback on whether this is working for you or not, and also your comments on other ideas that we could introduce.

My best regards to you all.

          There will be occasions when you want more than the 90° rotation that manufacturers set their servos to. Most of the servos I have come across are capable of more than the 90° rotation that we normally use. In fact, many are capable of as much as 180° rotation.

         One method of getting the extra rotation uses a feature found in some modern radios. You may discover that it has an "end point adjustment" facility. If you only need a little more than 90° rotation this facility may be all you need.

           If you need more than the radio can provide, or your radio does not have the facility, the second method is to connect a "servo stretcher" between your radio and the servo. 

             There are two varieties of servo stretcher, with and without end point adjustment. Some servos cannot rotate the full 180°, and a stretcher without end point adjustment may try to make your servo rotate the full 180° or more. If your servo rotation hits an end stop and cannot get the rotation that the stretcher calls for, then the servo motor stalls, keeps trying to reach the set limit, gets hot, and may burn out. To ensure you don't face this situation, you have to limit the amount of rotation.

          You may be able to limit the rotation using your radio's end point adjustment, otherwise a stretcher with the facility is necessary. Robotzone make a stretcher with  adjustable endpoints, currently available from Servocity and Active Robots. Stretchers without end point adjustment are available from a number of suppliers.

Hints and tips - Servo stretchers.

Hints and tips - Resistor values for LED's.

Nautical lore - Offshore Powerboat Racing, Part 2.

In Part 1 we learned a little about offshore powerboat which is led by the Union Internationale Motonautique (UIM) . In the USA, offshore powerboat racing is led by the American Power Boat Association (APBA) /UIM. The sport is financed by a mixture of private funding and commercial sponsors.
          In 1903, the Automobile Club of Great Britain and Ireland, and its offshoot, the Marine Motor Association, organised a race of auto-boats. The winner was awarded the Harmsworth Trophy. Offshore powerboat racing was first recognised as a sport when, in 1904, a race took place from the south-eastern coast of England to Calais, France. In the United States, the APBA was formed soon thereafter and the first U.S. recorded race was in 1911, in California.

October 2017

If you are fitting LED lighting to your model, and need to work out what value of resistor you need, refer to the quick reference guide here.

Our next club meeting will be on Tuesday 14th November at 7:30pm.

​Our next public display will be TBA.

The Word from the Quarterdeck

Hints and tips - Resistor values for LED's.