We used to secure the rudder on safari as follows:

Place a length of rope through the handle on the tail dolly, pass it on
either side of the fin and tie two half hitches snugged up against the
rudder. Tie the ends of the rope to your tie down stake or cable.

Good luck at the races!

Dan

On 12/16/2016 11:40 PM, bumper wrote:
An alternate version is similar to Ron Gleasons.

Instead bolting the PVC pipe together, use a length of rope and some bungee or a length of bungee cord. And two small balls.

The rope is tied to a length of bungee cord which is then threaded through the two pieces of PVC, a ball is tied to one end of rope/cord, the other end of bungee cord is looped with rubber ball on loop. To use, place rope hinge end forward with foam insulation covered PVC on each side of vertical stab. At trailing edge, stretch ball with bungee loop so that loop goes over other ball to secure it. Easy on and off and no steel hardware to potentially scratch anything. Bungee is mostly all covered so weathers well.

One I made had just a short length of bungee for the stretch - all knots were inside PVC so clean looking.

bumper

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Dan, 5J