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#11
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Turn co-ordinator
I never said that you will get "green line "vacuum. I did say that
the gyro's will continue to work with the vacuum that you will have with a windmilling engine. Go to 10K, windmill, and see that you still have useable gyro's. Been there, done that, they still work. On Tue, 01 Nov 2005 11:48:38 GMT, Jon Kraus wrote: You think wrong Bill. At least on my Mooney at idle doesn't come close to the vacuum gauge reading in the green. This is with a new dry pump too. I still doubt that a windmilling engine will keep the gyros spooled up enough to run the AI and DG. Just my .02. YMMV Jon Kraus '79 Mooney 201 4443H @ TYQ Bill Zaleski wrote: You think wrong, Jon. Even at idle, most vacuum pumps produce enough differential to keep rotors spinning satisfactorily. |
#12
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Turn co-ordinator
On 11/1/2005 17:43, Bill Zaleski wrote:
I never said that you will get "green line "vacuum. I did say that the gyro's will continue to work with the vacuum that you will have with a windmilling engine. Go to 10K, windmill, and see that you still have useable gyro's. Been there, done that, they still work. How long did you windmill? After all, the gyros are going to continue to spin for some time with no vacuum. The slower they go, the more difficulty they're going to have. Did you go for more than 5 or 10 minutes and verify that they were still working acceptably? On Tue, 01 Nov 2005 11:48:38 GMT, Jon Kraus wrote: You think wrong Bill. At least on my Mooney at idle doesn't come close to the vacuum gauge reading in the green. This is with a new dry pump too. I still doubt that a windmilling engine will keep the gyros spooled up enough to run the AI and DG. Just my .02. YMMV Jon Kraus '79 Mooney 201 4443H @ TYQ Bill Zaleski wrote: You think wrong, Jon. Even at idle, most vacuum pumps produce enough differential to keep rotors spinning satisfactorily. -- Mark Hansen, PP-ASEL, Instrument Airplane Sacramento, CA |
#13
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Turn co-ordinator
Yup. Right to the ground from 10K' bout 800FPM
Bill Z. A&P I.A. On Wed, 02 Nov 2005 07:46:24 -0800, Mark Hansen wrote: On 11/1/2005 17:43, Bill Zaleski wrote: I never said that you will get "green line "vacuum. I did say that the gyro's will continue to work with the vacuum that you will have with a windmilling engine. Go to 10K, windmill, and see that you still have useable gyro's. Been there, done that, they still work. How long did you windmill? After all, the gyros are going to continue to spin for some time with no vacuum. The slower they go, the more difficulty they're going to have. Did you go for more than 5 or 10 minutes and verify that they were still working acceptably? On Tue, 01 Nov 2005 11:48:38 GMT, Jon Kraus wrote: You think wrong Bill. At least on my Mooney at idle doesn't come close to the vacuum gauge reading in the green. This is with a new dry pump too. I still doubt that a windmilling engine will keep the gyros spooled up enough to run the AI and DG. Just my .02. YMMV Jon Kraus '79 Mooney 201 4443H @ TYQ Bill Zaleski wrote: You think wrong, Jon. Even at idle, most vacuum pumps produce enough differential to keep rotors spinning satisfactorily. |
#14
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Turn co-ordinator
"Mark Hansen" wrote in message ...
On 11/1/2005 17:43, Bill Zaleski wrote: I never said that you will get "green line "vacuum. I did say that the gyro's will continue to work with the vacuum that you will have with a windmilling engine. Go to 10K, windmill, and see that you still have useable gyro's. Been there, done that, they still work. How long did you windmill? After all, the gyros are going to continue to spin for some time with no vacuum. The slower they go, the more difficulty they're going to have. Did you go for more than 5 or 10 minutes and verify that they were still working acceptably? My gyros spin up from stopped to a usable state while my engines idle after startup. Don't yours? |
#15
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Turn co-ordinator
On 11/2/2005 08:33, John R. Copeland wrote:
"Mark Hansen" wrote in message ... On 11/1/2005 17:43, Bill Zaleski wrote: I never said that you will get "green line "vacuum. I did say that the gyro's will continue to work with the vacuum that you will have with a windmilling engine. Go to 10K, windmill, and see that you still have useable gyro's. Been there, done that, they still work. How long did you windmill? After all, the gyros are going to continue to spin for some time with no vacuum. The slower they go, the more difficulty they're going to have. Did you go for more than 5 or 10 minutes and verify that they were still working acceptably? My gyros spin up from stopped to a usable state while my engines idle after startup. Don't yours? What is usable? The AI usually doesn't straighten-up 100% until after I do my static run-up. However, the real sign is the vacuum gage. It reads below the green while idling. Now, the gyros are still spinning even while the vacuum is not in the green - but I wouldn't want to bet my life on them while in IMC conditions ... I may have to, but I wouldn't assume they are working 100% while the vacuum is below the green. -- Mark Hansen, PP-ASEL, Instrument Airplane Sacramento, CA |
#16
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Turn co-ordinator
"Mark Hansen" wrote in message ...
On 11/2/2005 08:33, John R. Copeland wrote: "Mark Hansen" wrote in message ... On 11/1/2005 17:43, Bill Zaleski wrote: I never said that you will get "green line "vacuum. I did say that the gyro's will continue to work with the vacuum that you will have with a windmilling engine. Go to 10K, windmill, and see that you still have useable gyro's. Been there, done that, they still work. How long did you windmill? After all, the gyros are going to continue to spin for some time with no vacuum. The slower they go, the more difficulty they're going to have. Did you go for more than 5 or 10 minutes and verify that they were still working acceptably? My gyros spin up from stopped to a usable state while my engines idle after startup. Don't yours? What is usable? The AI usually doesn't straighten-up 100% until after I do my static run-up. However, the real sign is the vacuum gage. It reads below the green while idling. Now, the gyros are still spinning even while the vacuum is not in the green - but I wouldn't want to bet my life on them while in IMC conditions ... I may have to, but I wouldn't assume they are working 100% while the vacuum is below the green. Roger that. Do you have any possibility of changing to a higher-capacity vacuum pump? (I assume your instrument filters aren't clogged, of course.) I show 5 inches Hg of vacuum at engine idle in my airplane. |
#17
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Turn co-ordinator
On 11/2/2005 09:02, John R. Copeland wrote:
"Mark Hansen" wrote in message ... On 11/2/2005 08:33, John R. Copeland wrote: "Mark Hansen" wrote in message ... On 11/1/2005 17:43, Bill Zaleski wrote: I never said that you will get "green line "vacuum. I did say that the gyro's will continue to work with the vacuum that you will have with a windmilling engine. Go to 10K, windmill, and see that you still have useable gyro's. Been there, done that, they still work. How long did you windmill? After all, the gyros are going to continue to spin for some time with no vacuum. The slower they go, the more difficulty they're going to have. Did you go for more than 5 or 10 minutes and verify that they were still working acceptably? My gyros spin up from stopped to a usable state while my engines idle after startup. Don't yours? What is usable? The AI usually doesn't straighten-up 100% until after I do my static run-up. However, the real sign is the vacuum gage. It reads below the green while idling. Now, the gyros are still spinning even while the vacuum is not in the green - but I wouldn't want to bet my life on them while in IMC conditions ... I may have to, but I wouldn't assume they are working 100% while the vacuum is below the green. Roger that. Do you have any possibility of changing to a higher-capacity vacuum pump? (I assume your instrument filters aren't clogged, of course.) I show 5 inches Hg of vacuum at engine idle in my airplane. Naw, Rental. C-172M -- Mark Hansen, PP-ASEL, Instrument Airplane Sacramento, CA |
#18
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Turn co-ordinator
John R. Copeland wrote:
My gyros spin up from stopped to a usable state while my engines idle after startup. Don't yours? You would hope so, because otherwise you're going to be in deep doodoo climbing up into the soup shortly after takeoff. |
#19
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Turn co-ordinator
Mark Hansen wrote:
What is usable? The AI usually doesn't straighten-up 100% until after I do my static run-up. Probably not the run-up but the elapsed time. It takes on the order of ten minutes for the gyros to stableize. However, the real sign is the vacuum gage. It reads below the green while idling. Fix your pump. |
#20
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Turn co-ordinator
Mark Hansen wrote: What is usable? The AI usually doesn't straighten-up 100% until after I do my static run-up. Then you got a bad gyro. My AI shakes like a son of a bitch for about 10 seconds and then settles down in the upright position. Idles speed about 900. Vacuum gauge will be bottom of the green at 1000 rpm. |
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