ratc
Well Known Member
Hi,
Like a good number of builders I try and make one large purchase each year........... This year it's the prop! Although I've not purchased the engine I've settled on an 0-320 D1A (160HP) with Dual Pmags. At least the prop can be stored without fear of deterioration!
My propeller of choice is the Catto FP, speaking to Craig it seems that the the "standard" spec. for the -4 is a 70" diameter pitched at 70" for 160HP
(68" for the 150HP).
Clearly everything with a FP propeller is a compromise, what would be very useful to see are the data points other -4 operators have with 0-320
(160HP) engines and FP propeller combinations in terms of T/O, cruise and Max RPM's figures along with fuel burns if available.
What is the largest diameter propeller that has been used on the -4 turned by an 0-320? Not withstanding ground clearance and tip speeds I wonder what a 72" diameter propeller would produce!
My mission profile will be operating out of small grass strips (1200ft+), flying long (ecconomical) cross countries and doing gentlemans aerobatics/formation. Just what the -4 was designed for!
I have already gleaned a lot of useful information from Smokey Ray and I'm looking forward to seeing the data from his new project the RVX to which he is fitting a Craig Catto masterpiece.
As an aside, I've also asked my good friend Steve Sampson (who lives a little under 10 miles away) to provide me with the data he has for his similarly engined aircraft which is equipped with the MT C/S propeller.
I know that it's not the case of "one size fits all" but any data Vs propeller spec. would be gratefully received in order to make the big decision, thanks.
Like a good number of builders I try and make one large purchase each year........... This year it's the prop! Although I've not purchased the engine I've settled on an 0-320 D1A (160HP) with Dual Pmags. At least the prop can be stored without fear of deterioration!
My propeller of choice is the Catto FP, speaking to Craig it seems that the the "standard" spec. for the -4 is a 70" diameter pitched at 70" for 160HP
(68" for the 150HP).
Clearly everything with a FP propeller is a compromise, what would be very useful to see are the data points other -4 operators have with 0-320
(160HP) engines and FP propeller combinations in terms of T/O, cruise and Max RPM's figures along with fuel burns if available.
What is the largest diameter propeller that has been used on the -4 turned by an 0-320? Not withstanding ground clearance and tip speeds I wonder what a 72" diameter propeller would produce!
My mission profile will be operating out of small grass strips (1200ft+), flying long (ecconomical) cross countries and doing gentlemans aerobatics/formation. Just what the -4 was designed for!
I have already gleaned a lot of useful information from Smokey Ray and I'm looking forward to seeing the data from his new project the RVX to which he is fitting a Craig Catto masterpiece.
As an aside, I've also asked my good friend Steve Sampson (who lives a little under 10 miles away) to provide me with the data he has for his similarly engined aircraft which is equipped with the MT C/S propeller.
I know that it's not the case of "one size fits all" but any data Vs propeller spec. would be gratefully received in order to make the big decision, thanks.