Reversing Problems
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Taycol Model Marine Electric Motors
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Two Taycols (the Meteor and the Asteroid) have reversing levers which may be directly operated using this unit. While a servo may be mounted in any convenient position, here are the lines for a simple mount which may be fastened direct to a motor:...

Three other Taycols (the Double Special, Supermarine Special and Standard) come with twin coils, but no reversing lever. They are intended to be used with a single pole changeover switch connected to the two 'reversing' terminals. A P105 may readily be used to drive a servo operating a commercial switch, or a small 'add-on' brass 'Taycol-Type' switch can be made as illustrated here....

The standard Taycol Supermarine requires a double-pole changeover switch. Again, the P105 can operate any suitable commercial double-pole switch, or a somewhat larger 'Taycol-type add-on' can be made as below:...
Jet (both gas and water) boats and steam engines share a requirement to operate reverse mechanically rather than electrically, and may use a third channel to select reverse via a servo operated lever. Occasionally ESCs have been developed which will output a servo signal automatically to perform this service when polarity changes to reverse, but they are not common items. MicroGyro used to do such an ESC (currently unavailable). If such a device is used, reversing a Taycol can be performed in the original design manner, using an ESC and radio in a completely standard way while having a servo automatically throw the 'reverse selector lever' when the Tx stick moves to reverse.

Action Electronics have recently brought out a seperate reversing unit which allows this facility to be added to any ESC - the P105 (details available here). Though not designed for the unusual requirements of a Taycol, it probably represents the ultimate in current Taycol R/C operation...
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Note that the 'Taycol-type' switches illustrated below were originally hand operated, and could require a little sideways pressure to make them operate smoothly. This is why there is a 'spring' washer included in the switch assembly, allowing a small sideways movement.

If such a switch is to be operated via a servo, it is recommended that the contact edges of both the lever and the contact washer are bevelled slightly to ensure that reliable operation occurs.
Using a built-in reversing servo
The P105 uses a small microprocessor to control a servo at the polarity change point. This can be quite sensitive to power-line interference. I matched it with a 'cheap chinese' ESC to give it deliberately poor test conditions, and I needed to put TWO ferrite suppressors on EACH power line from the Taycol (a ring AND a tube) before I could achieve reliable switching.

I had been experimenting with a purpose-designed relay switching circuit a few years ago to perform this function, but have not yet been able to get it to work under all conditions. If you can suppress your power feed effectively, the P105 represents the state of the art for performing seamless and lossless Taycol reversing.
Taycol operation with a servo
Taycol type switch
Simple Taycol Servo Mount
supermarine