Are you referring to NR/Luga propellers or is there also a NP prop? I just received my 2 blade NR 81" scimitar prop that will eventually go on my Yamaha Apex, but I ordered an adapter to run it on my model 5 with the Lycoming O-290. I currently run a 72" Whirl Wind ground adjustable GA200L. I am very happy with the compromise performance of the GA200L, but would like more STOL performance and less cruise speed, so I'm going to try the NR this week. I'll report back. I did a static pull test with the GA200L 72" and it pulled 400 lbs, I then tried a GA200L-STOL 78" and it pulled 461 lbs, but I lost 5 mph in cruise. Interested to see what the NR prop pulls.