My decades of towing experience has conclusively shown:
If you are towing a runabout with a single straight line stemming off of transom port or starboard you're asking for trouble.
If your towing with a single straight line stemming from transom center your towed boat will wander.
If you have a bridle stemming from both sides of transom with short straight line at towed boats center from bridle's "Y" the towed boat goes straight and steady.
NAUTICAL BRIDLE:
length of rope, chain, or cable fastened in a Y position for an object to be moved by vessel that is towing; pull being exerted at the center of the Y's length where the two cables junction
Also... for correct, comfortable towing of a runabout there are many items that dictate how long the bridal "Y" should be distanced off the transom as well as how long the centered line should be from the Y's junction to the nose of the towed runabout.
These items include but are not limited to:
- Speed while towing
- Type and size of tow boat's wake
- Hull design of towed boat
- Trim of towed boat
- Weather/wind/wave conditions during tow
Each package of a towing and towed boat has its own nuances for getting the tow to be as smooth and trouble free as possible. Don't be afraid to experiment with different options. Once you get the options in correct stance towing becomes a breeze!
Happy Tow-Daze! - Art