RE: 16X8 or 18X10 Biela Wide Blade? RCV 120SP
I don't think the 16x8 will have enough pitch. At the lower prop rpm that the RCV turns, you'll need more pitch. I would guess a 16x12 would be more appropriate. I seem to recall reading in either their documentation, or on their RCU support forum, that they don't recommend anything less than a 10 pitch.
Scott