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#11
November 28th 03, 05:46 PM
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David Lesher wrote: Does garbage really migrate upstream into the expensive toys? If a dry pump fails, the carbon vanes may turn into powder. When this happens, the pressure on the instrument side is lower than atmospheric pressure, and you may wind up with some of this powder being blown back into the instruments. In normal use, however, garbage does not migrate back upstream. (And if so, you'd thunk someone would add a inline filter between the toy and the common vacuum line..) Some people do this as a preventative measure. Alternatives include prophylactic replacement of the dry pump to attempt to ensure it never fails, using a wet pump, and cleaning the instruments before using them after a pump fails. The filter is cheap insurance. George Patterson Some people think they hear a call to the priesthood when what they really hear is a tiny voice whispering "It's indoor work with no heavy lifting". 
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#12
November 29th 03, 11:32 PM
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Was that with the exchange? I'm looking for an a/p DG, but have
nothing to trade. On Fri, 28 Nov 2003 15:29:52 GMT, "Jay Honeck" wrote: What did the Gyro House hit you up for the A/P DG? $515, plus tax and shipping.
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#13
November 30th 03, 01:01 AM
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How old were your gyros? At 10,000 rpm (just a guess) a gyro revolves
600,000,000 times in 1000hrs. Mike MU-2 "Jay Honeck" wrote in message news:1lzxb.331132$Tr4.1006704@attbi_s03... A couple of months ago our AI, which had been "coming and going", finally went. We replaced it with a rebuilt unit from "The Gyro House", which had the dual effect of getting our autopilot working properly again. Last month, our DG failed completely and suddenly, after a normal landing in Pella, IA. Before that landing it worked, after that landing it didn't. And the autopilot -- connected to the DG, too -- stopped working again. So, I've just received a rebuilt unit from the Gyro House. As a precaution (I'm assuming some sort of contamination caused the second failure), I've ordered new vacuum hoses -- enough for my A&P to replace all the hoses, from the vacuum pump to the firewall, and from the firewall to the two vacuum instruments. I'm also having him replace all the filters. Short of replacing the vacuum pump itself (which is still working fine), is there anything else I should be watching? -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination"
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#14
November 30th 03, 01:03 AM
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"Mike Rapoport" wrote in message link.net... How old were your gyros? At 10,000 rpm (just a guess) a gyro revolves 600,000,000 times in 1000hrs. I hate to think how many revolutions my 7200RPM hard drive makes in a year (24/7).
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#15
November 30th 03, 01:52 AM
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Was that with the exchange? I'm looking for an a/p DG, but have
nothing to trade. Yep. They charged my card $2100, and they will credit me back the difference when I return the old DG. How's THAT for a good incentive to get that thing in the mail? :-) -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination"
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#16
November 30th 03, 03:50 AM
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But you HDD was sealed in a cleanroom. Vacuum gyros are constantly
injesting grit. Mike MU-2 "Tom S." wrote in message ... "Mike Rapoport" wrote in message link.net... How old were your gyros? At 10,000 rpm (just a guess) a gyro revolves 600,000,000 times in 1000hrs. I hate to think how many revolutions my 7200RPM hard drive makes in a year (24/7).
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#17
November 30th 03, 11:56 AM
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WOW, sure is! Isn't the new STec DG around $2300?
On Sun, 30 Nov 2003 01:52:49 GMT, "Jay Honeck" wrote: Was that with the exchange? I'm looking for an a/p DG, but have nothing to trade. Yep. They charged my card $2100, and they will credit me back the difference when I return the old DG. How's THAT for a good incentive to get that thing in the mail? :-)
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#18
November 30th 03, 02:27 PM
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WOW, sure is! Isn't the new STec DG around $2300?
Yeah, for some reason electric DGs are outrageously more expensive than vacuum ones. Anyone know why? -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination"
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#19
November 30th 03, 04:35 PM
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Jay Honeck wrote:
WOW, sure is! Isn't the new STec DG around $2300? Yeah, for some reason electric DGs are outrageously more expensive than vacuum ones. Anyone know why? Probally a dumb question, but I have to ask. would a GPS not be more accurate than a DG ?
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#20
November 30th 03, 05:23 PM
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Probally a dumb question, but I have to ask. would a GPS not be more
accurate than a DG ? Yes, but many autopilots are "slaved" to a "heading bug" on your DG. This set-up pre-dates GPS by decades, and is much cheaper than the (seemingly simpler) GPS-autopilot connection. Again, there is no logic to this -- but what else is new? -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination"
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