Bob Axsom said:I read that article when it first came out but I had already had my prop for three years then so I wasn't about to change at that point. As it is I see that they limited the RPM to 2,500 which is below the peak aircraft speed node I saw at 2600 RPM in a little test I ran with my non-blended prop. The blended airfoil prop looks better at 2500 RPM and may be even "more" better at higher RPM where tip speeds are supposed to start causing inefficiencies. Based on what I know right now I will continue to watch the information that becomes available and probably go to a blended airfoil prop at the next prop overhaul if the information continues to support the supremacy of the blended airfoil prop. In next year's Air Venture Cup I will stay low and run the 500 miles at 2600 RPM, max power lean.
Bob Axsom
Josep ma said:avpro56 say:
The other nice benefit the blended airfoil prop (HC-C2YR) was that the continous operation below 2250 RPM limitation was removed.
Is that true??
in Vans webStore still say:
**PROP C2YR-1BF/F7496 (I)O-360 (180hp) diameter: 74"
Application: RV-6A, RV-7A, RV-8/8A
**With the following restrictions:
Note: When installed on an engine with magnetos, aftermarket electronic ignition, LASAR system, or FADEC system then the following restrictions apply:
1: Do not operate above 22" manifold pressure below 2350 rpm.
2: Operation above 2600 rpm is limited to takeoff. As soon as practical after takeoff the rpm should be reduced to 2600 rpm or less.
3: FADEC equipped aircraft maximum engine RPM must be limited to 2650 RPM at ALL times.
regads,
Josep Ma
www.telefonica.net/web2/rv7e