I know many folks ran the 17-12 full blade on the 140DZ. I alwasy felt this was topo much load on the engine. I prefered the 15.5-12.5W or the 16-12. I learned from the european and japanese pilots that the smaller prop wqs better on the engine and better on the noise. A 15.5-12.5W was a really good prop on the 140DZ it was whisper quiet and pulled like stink. I say run it about 8400-8600rpm. This will make the best power. For me the 17-12 would load the engine too far down to about 8000 maybe 8200 on a really frsh strong one...this made things more critical. I ran the 17-12 regular on the 160DZ. I also know that this was the prop and setup used by CPLR for many years and a couple World champs. 160DZ on the 17-12.

Troy Newman
Team YS