I honestly doubt that vinyl fencing would deter the raccoons. They are amazingly agile, and having opposable thumbs (think of little people hands), can climb just about anything you can devise. As for jumping? That I don't know....never seen one jump. I suspect that with their excellent climbing skills, there isn't much call for it.
As for turtles getting large enough to not be prey...I doubt it? Unless and animal poses a threat to a raccoon, I don't see any way the raccoon would not consider it a possible meal option. Turtles are not overly intimidating.
There are certain things that will deter raccoons, ammonia soaked rags, loud noises (radio set to a talk show) that are commonly suggested to folks who wish resident raccoons to move on. Those may be of some help.
If you do go ahead with this, you could also make sure there is an ample food supply available for the raccoons...fruits/dog kibble/veggies are all things they enjoy. Of course, if you live in the city...that may not be an option.
Have you checked out the turtle message boards for suggestions? I am sure others have built outoor turtle enclosures with success, maybe a good place to check. If you visit http://forums.kingsnake.com, there are a number of turtle boards listed. Good luck, wish I could offer more help!
Joker
>>I was thinking of that new kind of vynil fencing. It looks like they wouldn't be able to climb up it. I would have to do something about digging under it anyway, so the turtles don't dig out.
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>>How high can raccoons jump?
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>>Can turtles get big enough so that they aren't prey anymore?
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