As you can see those are two different monsters, the 440 will not give you the same characteristics as the 1440, they are 2 completely different blade shapes. You can notch the 440 at the hub to unload the tip so the smaller 12 engine can turn it, or back cut the entire trailing edge and do a bit of cupping on the blade to get near to the same performance range. The only way to get the Ride\Performance of That 1440 is to Get One. It looks like he puts A Lot of work into that prop, it definitely wouldn't be an easy one to match.
AB it looks like you need to take a Big Stick to the pond with you and beat That Beaver in the head that's been Chewing on that 1440.
or do you have Turtle Problems the same as we do down here..[:@]
I Hate Turtles[:'(][:@][:-][X(]