Prop for SD2

[nitrotoys]

I Know Seaducer says to use X440 3 blade for the SD3, I have a SD2, Now the 440 2 and 3 blade is alittle to much, The 438 works great.

I am going to cut down a 440 2 blade and see, but is there any suggestions on what i need to do?

Power plant is a MAC.21, Brown pipe, nooo muffled on it.

Thanks

NT