Tony Spicer
Well Known Member
Google struck out on this one, so it must not exist. Hopefully, some of you prop experts will see this and comment.
I have a Catto 2007 model two blade 68x76 on my 160 hp RV-3B. Static rpm on a cool day at SL is 2200. Unloads to 2320 on takeoff roll.
WOT at 1000' DA is 2980 rpm and 219 mph TAS. Pulled back to 2700 at the same DA speed is 197 mph TAS.
WOT at 8000' DA is 2890 rpm and 210 mph TAS. Pulled back to 2700 rpm speed is 197 mph TAS.
My bud has the almost identical prop (2" less pitch) on his 160 hp RV-4. Static is 2200 and WOT at 1000' DA is 2800 rpm.
Craig Catto is happy with the prop as-is. So am I as long as I remember to pull the throttle back when the nose comes down. Craig says he can repitch the prop and reduce WOT rpm by 150, but I'm guessing that will bring the static way down as well. So for now I'm sticking with what I have.
All numbers are from a Dynon D180 and confirmed correct.
Bart Lalond says it won't harm the engine to occasionally kick it into RV-4 passing gear, but it will wear faster when operated at the higher rpm's.
Comments welcomed!
Tony
I have a Catto 2007 model two blade 68x76 on my 160 hp RV-3B. Static rpm on a cool day at SL is 2200. Unloads to 2320 on takeoff roll.
WOT at 1000' DA is 2980 rpm and 219 mph TAS. Pulled back to 2700 at the same DA speed is 197 mph TAS.
WOT at 8000' DA is 2890 rpm and 210 mph TAS. Pulled back to 2700 rpm speed is 197 mph TAS.
My bud has the almost identical prop (2" less pitch) on his 160 hp RV-4. Static is 2200 and WOT at 1000' DA is 2800 rpm.
Craig Catto is happy with the prop as-is. So am I as long as I remember to pull the throttle back when the nose comes down. Craig says he can repitch the prop and reduce WOT rpm by 150, but I'm guessing that will bring the static way down as well. So for now I'm sticking with what I have.
All numbers are from a Dynon D180 and confirmed correct.
Bart Lalond says it won't harm the engine to occasionally kick it into RV-4 passing gear, but it will wear faster when operated at the higher rpm's.
Comments welcomed!
Tony