Hi,
I got a request from my local aviation authorities to provide the necessary documentation for the engine and propeller setup I would like to use in my RV-9.
Originally I got approval to install the IO-320 with 160 hp from Superior: XP-IO-320-B1AD2. But my engine shop advised to install the IO-360 at reduced RPM instead: XP-IO-360-B1AD2.
XP = Superior
IO = Fuel Injection
360 = 360 Cylinders
B = Constant Speed Thin Wall
1 = 1 Dynafocal Rear Governor
A = Unison PA FI
D = Horizontal Front, Roller Lifter (FI Only)
2 = Power Group 8.5 / 180
Primary reasons for this suggestion are noise reduction, less engine vibrations + stabilization and reduced wear. By limiting the maximum RPM to 2400 we never exceed the 160hp. Important note: We are not allowed to exceed the maximum as defined by VANS. For my RV-9 this is 160 hp.
The aviation authorities now want to know which propeller I would like to use. I did not yet decided but I would like to go for a WW200 RV of a Harztell two bladed metal propeller. I prefer to use a constant speed setup.
This idea to reduce the RPM on an O-360 is not invented by the engine shop. It has already been done on a Cessna 172 with an IO-360-L2A:
FAA Type Certificate 1E10
Rated horspower: 160
Rated speed, RPM: 2400
Bore, inches: 5.125
Stoke, inches: 4.375
Displacement, cubic inches: 361.0
Compression ratio: 8.5:1
Firing order: 1-3-2-4
Spark occurs, degrees BTC: 25
Valve rocker clearance (hydraulic tappets collapsed): .028-.080
Propeller drive ratio: 1:1
Propeller driven rotation (viewed from rear): Clockwise
The authorities responded that this is correct, but that the setup was with a Mac Cauley 1C 235/LFA 7570, fixed pitch propeller. Not a constant speed.
They do not deny my request, but I should provide them the necessary paperwork for a setup with a constant speed Hartzell/WhirlWind.
Is anyone using this or a similar setup or able to help me to provide these details? I have already contacted both Hartzell and WW, but they appear not to be the fastest to answer. I am bit on time pressure because I ordered my wing/fuselage/firewall forward/finishing kit and they will be shipped end of January. Major issue is that my exhaust was ordered at Vetterman because VANS can not deliver a standard exhaust for a Superior engine with cold sump. These orders were made for an IO-360. If I don't provide the paperwork to the AA, I will never get my airworthiness certificate.
Any help is more then welcome.
I got a request from my local aviation authorities to provide the necessary documentation for the engine and propeller setup I would like to use in my RV-9.
Originally I got approval to install the IO-320 with 160 hp from Superior: XP-IO-320-B1AD2. But my engine shop advised to install the IO-360 at reduced RPM instead: XP-IO-360-B1AD2.
XP = Superior
IO = Fuel Injection
360 = 360 Cylinders
B = Constant Speed Thin Wall
1 = 1 Dynafocal Rear Governor
A = Unison PA FI
D = Horizontal Front, Roller Lifter (FI Only)
2 = Power Group 8.5 / 180
Primary reasons for this suggestion are noise reduction, less engine vibrations + stabilization and reduced wear. By limiting the maximum RPM to 2400 we never exceed the 160hp. Important note: We are not allowed to exceed the maximum as defined by VANS. For my RV-9 this is 160 hp.
The aviation authorities now want to know which propeller I would like to use. I did not yet decided but I would like to go for a WW200 RV of a Harztell two bladed metal propeller. I prefer to use a constant speed setup.
This idea to reduce the RPM on an O-360 is not invented by the engine shop. It has already been done on a Cessna 172 with an IO-360-L2A:
FAA Type Certificate 1E10
Rated horspower: 160
Rated speed, RPM: 2400
Bore, inches: 5.125
Stoke, inches: 4.375
Displacement, cubic inches: 361.0
Compression ratio: 8.5:1
Firing order: 1-3-2-4
Spark occurs, degrees BTC: 25
Valve rocker clearance (hydraulic tappets collapsed): .028-.080
Propeller drive ratio: 1:1
Propeller driven rotation (viewed from rear): Clockwise
The authorities responded that this is correct, but that the setup was with a Mac Cauley 1C 235/LFA 7570, fixed pitch propeller. Not a constant speed.
They do not deny my request, but I should provide them the necessary paperwork for a setup with a constant speed Hartzell/WhirlWind.
Is anyone using this or a similar setup or able to help me to provide these details? I have already contacted both Hartzell and WW, but they appear not to be the fastest to answer. I am bit on time pressure because I ordered my wing/fuselage/firewall forward/finishing kit and they will be shipped end of January. Major issue is that my exhaust was ordered at Vetterman because VANS can not deliver a standard exhaust for a Superior engine with cold sump. These orders were made for an IO-360. If I don't provide the paperwork to the AA, I will never get my airworthiness certificate.
Any help is more then welcome.
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