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V* engines share a common crankshaft with both banks, that's the V part. Please cite any specific V12 aircraft engine that can have one bank of cylinders shut d

V* engines share a common crankshaft with both banks, that's the V part. Please cite any specific V12 aircraft engine that can have one bank of cylinders shut down. I don't believe one exists.

baybal2 6y ago
Of course the crankshaft is shared. It is oil, fuel, and cooling that can be shut down to prevent leaks.
ledauphin 6y ago
I don't know much about aircraft engines, but in fact straight-6 engines are inherently balanced, and a V12 is fundamentally two straight sixes, so at least in theory it would be quite possible to stop using one bank of cylinders if some of their cylinders suffered some form of non-catastrophic failure.
akrain 6y ago
Although I can't find a reference to an aircraft engine, Chrysler did have a variable displacement tech on its third gen Hemi engines that could turn off one bank of the V8. Ref: https://en.wikipedia.org/wiki/Multi-Displacement_System https://en.wikipedia.org/wiki/Multi-Displacement_System
desdiv 6y ago
>Please cite any specific V12 aircraft engine that can have one bank of cylinders shut down. The RED A03 Engine[0], which is what this sub-thread is about. >Two cylinder-bank redundancy concept for high safety. >Robustness and safety are incorporated into the engine design. The two 6-cylinder banks are capable of independent operation. All critical engine sub-systems are mutually-independent. [0] https://red-aircraft.com/ https://red-aircraft.com/
- londons_explore 6y ago
  Except the crankshaft... Oh, and any mechanical issues with pistons or valves in one side will jam the crankshaft, therefore stop the other half working... And that crankshaft needs some kind of oil... And a pump to pressurize that oil. And if a leak forms anywhere the oil drains out and the crankshaft seizes. Pretty hard to lube one crankshaft with two redundant and isolated oil systems... Overall, I'd call the engine 1.5x redundancy...
  - calcifer 6y ago
    Agreed. Based on the documents, I also don't see any protection against metorites or the sudden loss of oxygen in the planet's atmosphere. That's not even 1x redundancy really.
kube-system 6y ago
Most V engines can operate this way -- obviously not at full power. GM, Daimler, Honda, and FCA do this on some of their production v6, v8, and v12 engines. It is not that difficult to skip some cylinders, engines have a lot of rotating momentum. https://en.wikipedia.org/wiki/Multi-Displacement_System https://en.wikipedia.org/wiki/Multi-Displacement_System https://en.wikipedia.org/wiki/Active_Fuel_Management https://en.wikipedia.org/wiki/Active_Fuel_Management https://en.wikipedia.org/wiki/Active_Cylinder_Control https://en.wikipedia.org/wiki/Active_Cylinder_Control https://en.wikipedia.org/wiki/Variable_Cylinder_Management https://en.wikipedia.org/wiki/Variable_Cylinder_Management
- NovemberWhiskey 6y ago
  There is a huge difference between being able to operate in a managed cylinder deactivation mode vs being able to operate when one whole bank is experiencing some kind of catastrophic failure.
  - kube-system 6y ago
    True, I was addressing the question at face value.

V* engines share a common crankshaft with both banks, that's the V part. Please cite any specific V12 aircraft engine that can have one bank of cylinders shut down. I don't believe one exists.

baybal2 6y ago

Of course the crankshaft is shared. It is oil, fuel, and cooling that can be shut down to prevent leaks.

ledauphin 6y ago

I don't know much about aircraft engines, but in fact straight-6 engines are inherently balanced, and a V12 is fundamentally two straight sixes, so at least in theory it would be quite possible to stop using one bank of cylinders if some of their cylinders suffered some form of non-catastrophic failure.

akrain 6y ago

Although I can't find a reference to an aircraft engine, Chrysler did have a variable displacement tech on its third gen Hemi engines that could turn off one bank of the V8. Ref: https://en.wikipedia.org/wiki/Multi-Displacement_System https://en.wikipedia.org/wiki/Multi-Displacement_System

desdiv 6y ago

>Please cite any specific V12 aircraft engine that can have one bank of cylinders shut down. The RED A03 Engine[0], which is what this sub-thread is about. >Two cylinder-bank redundancy concept for high safety. >Robustness and safety are incorporated into the engine design. The two 6-cylinder banks are capable of independent operation. All critical engine sub-systems are mutually-independent. [0] https://red-aircraft.com/ https://red-aircraft.com/

londons_explore 6y ago
Except the crankshaft... Oh, and any mechanical issues with pistons or valves in one side will jam the crankshaft, therefore stop the other half working... And that crankshaft needs some kind of oil... And a pump to pressurize that oil. And if a leak forms anywhere the oil drains out and the crankshaft seizes. Pretty hard to lube one crankshaft with two redundant and isolated oil systems... Overall, I'd call the engine 1.5x redundancy...
- calcifer 6y ago
  Agreed. Based on the documents, I also don't see any protection against metorites or the sudden loss of oxygen in the planet's atmosphere. That's not even 1x redundancy really.

kube-system 6y ago

Most V engines can operate this way -- obviously not at full power. GM, Daimler, Honda, and FCA do this on some of their production v6, v8, and v12 engines. It is not that difficult to skip some cylinders, engines have a lot of rotating momentum. https://en.wikipedia.org/wiki/Multi-Displacement_System https://en.wikipedia.org/wiki/Multi-Displacement_System https://en.wikipedia.org/wiki/Active_Fuel_Management https://en.wikipedia.org/wiki/Active_Fuel_Management https://en.wikipedia.org/wiki/Active_Cylinder_Control https://en.wikipedia.org/wiki/Active_Cylinder_Control https://en.wikipedia.org/wiki/Variable_Cylinder_Management https://en.wikipedia.org/wiki/Variable_Cylinder_Management

NovemberWhiskey 6y ago
There is a huge difference between being able to operate in a managed cylinder deactivation mode vs being able to operate when one whole bank is experiencing some kind of catastrophic failure.
- kube-system 6y ago
  True, I was addressing the question at face value.