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#1
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Green Arc Red Zone
Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me
to thinking. What aircraft do you fly/have you flown/do you have first hand knowledge of which have a red zone somewhere in the green arc of the tachometer? For example, I know there are/were certain models of Cessna 210's that had such markings, but I cannot remember the specific models/engine/prop combinations. |
#2
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Green Arc Red Zone
Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me to thinking.
What aircraft do you fly/have you flown/do you have first hand knowledge of which have a red zone somewhere in the green arc of the tachometer? There was one aircraft I flew (C172? Arrow?) which had a placard to avoid operations between (I think) 2000 and 2200, or something like that. It was not marked as a red zone on the tach though. Jose -- He who laughs, lasts. for Email, make the obvious change in the address. |
#3
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Green Arc Red Zone
john smith wrote:
Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me to thinking. What aircraft do you fly/have you flown/do you have first hand knowledge of which have a red zone somewhere in the green arc of the tachometer? My club used to have an Arrow-II which had a red arc from (IIRC 2150 - 2300 RPM). Green above and below that. The POH listed only two allowable cruise RPMs: 2100 or 2400, nothing in between. I may be off a little on the actual numeric values. |
#4
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Green Arc Red Zone
Several reasons for a restricted RPM, due to harmonic
vibration...some say not to have prolonged operation in certain RPM ranges, some have a red range in the green arc. I think Lycomng has a FAQ on their engines. "Roy Smith" wrote in message ... | john smith wrote: | Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me | to thinking. | What aircraft do you fly/have you flown/do you have first hand knowledge | of which have a red zone somewhere in the green arc of the tachometer? | | My club used to have an Arrow-II which had a red arc from (IIRC 2150 - 2300 | RPM). Green above and below that. The POH listed only two allowable | cruise RPMs: 2100 or 2400, nothing in between. | | I may be off a little on the actual numeric values. |
#5
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Green Arc Red Zone
C-177B models also had a red zone range
you could feel the vibration in the floor if you were in the "red zone", neat trick for instructors.. Instructor to student: "you feel that vibration" Student: "yes"... Instructor: "Then do something about it" Student: "What should I do? I'm not flying to fast.." Instructor: "You think maybe the engine or prop are trying to tell you something?" Student: "Oh yah.. That red arc" BT "john smith" wrote in message ... Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me to thinking. What aircraft do you fly/have you flown/do you have first hand knowledge of which have a red zone somewhere in the green arc of the tachometer? For example, I know there are/were certain models of Cessna 210's that had such markings, but I cannot remember the specific models/engine/prop combinations. |
#6
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Green Arc Red Zone
"john smith" wrote in message ... Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me to thinking. What aircraft do you fly/have you flown/do you have first hand knowledge of which have a red zone somewhere in the green arc of the tachometer? For example, I know there are/were certain models of Cessna 210's that had such markings, but I cannot remember the specific models/engine/prop combinations. |
#7
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Green Arc Red Zone
Jose wrote:
There was one aircraft I flew (C172? Arrow?) which had a placard to avoid operations between (I think) 2000 and 2200, or something like that. It was not marked as a red zone on the tach though. I'll bet it was the Arrow. I recall seeing the same sort of placard but nothing on the tach, either. -- Mortimer Schnerd, RN mschnerdatcarolina.rr.com |
#8
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Green Arc Red Zone
"Jim Macklin" wrote in message ... Several reasons for a restricted RPM, due to harmonic vibration...some say not to have prolonged operation in certain RPM ranges, some have a red range in the green arc. I think Lycomng has a FAQ on their engines. The Lockheed Electra sure could have used a prop AD for this one! Dudley Henriques "Roy Smith" wrote in message ... | john smith wrote: | Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me | to thinking. | What aircraft do you fly/have you flown/do you have first hand knowledge | of which have a red zone somewhere in the green arc of the tachometer? | | My club used to have an Arrow-II which had a red arc from (IIRC 2150 - 2300 | RPM). Green above and below that. The POH listed only two allowable | cruise RPMs: 2100 or 2400, nothing in between. | | I may be off a little on the actual numeric values. |
#9
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Green Arc Red Zone
"Dudley Henriques" wrote The Lockheed Electra sure could have used a prop AD for this one! So there was a RPM restriction on the Electra? What do you recall? Didn't a constant speed prop pretty much bypass it? -- Jim in NC |
#10
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Green Arc Red Zone
"Morgans" wrote in message ... "Dudley Henriques" wrote The Lockheed Electra sure could have used a prop AD for this one! So there was a RPM restriction on the Electra? What do you recall? Didn't a constant speed prop pretty much bypass it? -- Jim in NC I only have a vague recall on this. It came up during a safety meeting at the Naval Test Pilots School many years ago. If I remember right, it involved a harmonic mode (whirl I believe) not transmitting correctly through the outboard engine mounts on the airplane. They specified certain conditions that caused this to happen but I don't remember what they were. I seem to recall that after the issue was addressed by Lockheed and the mounts were redesigned, there was a further wing issue as well that had to be dealt with. I think Macklin will probably be the guy who can best deal with exactly what was going on. Dudley Henriques |
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