Rudder flaps

[monocerosin]

1979 Hunter 37c.
There were broken remnants of rudder flaps when we hauled out that we threw away. Since then I have filled the holes and i am reconsidering if I want to try to fabricate flaps or just leave the holes filled and not mess with it.
I have read about cavitation and I tried to find a thread here talking about it with no luck.
Am I fine to leave them off?
Thanks!

 

[Johnb]

The sky will not fall if you don't replace the flaps, but if you want to preserve the original design this is what they look like. I still have them.