ron sterba
Well Known Member
I have a IO 320 D1A in my RV9A. What model three bladed CATTO prop would you recommend that would allow me to get 2600 RPMS.
Thanks Ron in Oregon.
Thanks Ron in Oregon.
Thanks Mel, Mel are you able to get 2600 rpms out of your o-320?
Scott have fun building that ship,sounds like you have a good combo of machinery.
Ron in Oregon RV9A
Mel and Mark thanks for the feed back. Do you find that the 3 blade prop slows you down faster when you pull the throttle back,,,,,say in the pattern? I understand the 3 blade also runs smoother less vibration in the cockpit.
Cheers
Ron in Oregon.
So have a question if you are getting 2750 wot @ 8000 da, what happens at 14000 da? Do you gotta pull back the throttle or does rpm come down? I am planning the same setup in my rv9. But plan to cruise higher.
Thanks Terry, now there's two Rv with the same prop, sounds like this is model to get but with the nickel leading edge. I hope to hear more experience on the Catto 3 blade, Terry is it really quitter and a less vibration? RV9A
You may find Craig will recommend a two blade unless you are specifically requesting a 3 blade. That is what he recommended for my 150 hp RV6.
All I know is that when I switched from a two-blade Aymar-Demuth to a three-blade Catto in front of my 140 HP O-290-D2, the vibration was much less. Whether that was due to the increased mass of the three-blade, or three vs. two blades (or both), I don't know....when you have a four cylinder engine and a two bladed prop you have harmonics generated by pulses of the two blade prop in sequence with the firing of each cylinder where as in 4 cylinder and three bladed prop all the pulses are out of seq ...
All I know is that when I switched from a two-blade Aymar-Demuth to a three-blade Catto in front of my 140 HP O-290-D2, the vibration was much less. Whether that was due to the increased mass of the three-blade, or three vs. two blades (or both), I don't know.
The downside was that my power off glide ratio was much less with the Catto.
Got a RV9A ,about 8 hrs now. No enthusiasm to build gear leg and intersection fairings. Are there after market makers.
Thanks
Ron in Oregon RV9A