A possible solution to your Skyraider propeller issue might be to consider the propellers from one of the many F4U Corsair kits as that propeller (even though it has a spinner/hub) is roughly the same diameter as the propeller used on the Skyraider. Another possible donor kit might be a 1/72nd scale B-29, C-97, B-50 (the Academy kits). While that propeller is a bit larger in diameter, you can trim it down to the size you need.