Do you have a manifold pressure gauge? If so, you could create your own power chart from the info in the Lycoming O-320 Operator's Manual. I think the best sort of chart would be one that had tables for different altitudes, with the table listing MP along one axis, and rpm along the other axis, with the percent power for each rpm and MP combination. You would set a MP value with the throttle, let the aircraft stabilize, see what the rpm was, then look in the table to see what percent power resulted from that rpm, MP and altitude.ksouthar said:Does anyone have or can direct me to a source for the power setting charts for the 0-320 (150 hp) with a catto 3-blade prop?
I second Pierre's analysis. I have a 3 blade Catto on my -8 with an IO-360-A3B6D and I get 1800'/min at 1650 lbs. I have seen as high as 2200'/min on a cold day, and as little as 1400'/min on a hot and steamy day.pierre smith said:Mornin' y'all. It doesn't matter that you have a Catto prop........we do too. Just find a Skyhawk with a 150 HP engine and use those numbers. We have a 180 HP Lyc with three blade Catto and 75% at 7500 ft is 2700 RPM and get 198 MPH Gps speed on a four way run in our 6A. The prop is sooooooooo smooth and Craig pitched it for max cruise. Although we only get 2250RPM on initial takeoff, we climb at 1900 ft/min solo at 135 MPH! We usually see 180 + at 2500 RPM at most any altitude as well,
Pierre
rv9builder said:Here's what I'd like to know . . .
On a 160 h.p. O-320 powered RV9A, what's faster, a 79" Sensenich at 2600 rpm or the Catto at 2700 rpm? It would also be interesting to know which one climbs better.
Has anybody done a side-by-side comparison?
Mark
Any new information on the prop comparison? I'm looking for the same info...rv9builder said:Here's what I'd like to know . . .
On a 160 h.p. O-320 powered RV9A, what's faster, a 79" Sensenich at 2600 rpm or the Catto at 2700 rpm? It would also be interesting to know which one climbs better.
Has anybody done a side-by-side comparison?
Mark