Yak-List Digest Archive

Mon 11/16/09


Total Messages Posted: 11



Today's Message Index:
----------------------
 
     0. 12:23 AM - Contributions Down By 21%... (Matt Dralle)
     1. 03:52 AM - Re: Re: generator question (A. Dennis Savarese)
     2. 06:36 AM - Re: generator question (keithmckinley)
     3. 07:38 AM - Tim Gagnon (John Sykes)
     4. 08:21 AM - The future of Nanchangs? (Pete Fowler)
     5. 08:39 AM - Re: The future of Nanchangs? (RAMPEYBOY@aol.com)
     6. 08:53 AM - Re: The future of Nanchangs? (Jim Selby)
     7. 06:35 PM - Re: Re: generator question (Yak Pilot)
     8. 07:04 PM - Re: DC-3 Pilot in the News (Yak Pilot)
     9. 07:31 PM - Re: generator question (keithmckinley)
    10. 07:45 PM - Re: Re: generator question (Jim Griffin)
 
 
 


Message 0


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    Time: 12:23:39 AM PST US
    From: Matt Dralle <dralle@matronics.com>
    Subject: Contributions Down By 21%...
    Dear Listers, As of today, contributions to the Matronics List Fund Raiser are lagging behind last year at this time by 21%. I have a fund raiser each year simply to cover my operating costs for the Lists. I *do not* accept any advertising income to support the Lists and rely solely on the contributions of members to keep the expenses paid. I run all of my own servers and they are housed here locally, and the Internet connection is a commercial-grade, T1 connection with public address space. I also maintain a full backup system that does nightly backups of all List-related data so that in the event of a server crash or worse, all of the Lists and the many years of List archive data could be restored onto a new server in a matter of hours. All of this costs a fair amount of money, not to mention a significant amount of my personal time as well. I have a Fund Raiser each year to cover these costs and I ask that members that feel they receive a benefit from my investments, make a modest contribution each year to support the continued operation and upgrade of these services. If you enjoy the Lists, please make a contribution today. I also offer some incentive gifts for larger contribution levels. At the Contribution Web Wite, you can use a credit card, Paypal, or personal check to show your support for the continuation of these services: http://www.matronics.com/contribution Thank you for your support! Matt Dralle Matronics Email List Administrator


    Message 1


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    Time: 03:52:41 AM PST US
    From: "A. Dennis Savarese" <dsavarese0812@bellsouth.net>
    Subject: Re: generator question
    The problem Mike is experiencing sounds more like a voltage regulator issue. If you have a digital volt meter, connect it to the 28 volt buss. Run the engine up and see if the voltage stabilizes after the engine RPM gets above about 1200 RPM. I don't know if you have a 52 or a CJ. If it's a 52, there is a rheostat (slotted screw) on the left side by the flap lever that you can adjust the voltage level. It should read about 28 volts when the engine is running between about 1200 rpm (41%) and WOT (100%) or 2900 RPM. You can also push the Volt meter button in and read VOLTS on the inner scale of the instrument (the small gold letters). Dennis ----- Original Message ----- From: keithmckinley To: yak-list@matronics.com Sent: Sunday, November 15, 2009 9:42 PM Subject: Yak-List: Re: generator question <keith.mckinley@townisp.com> Hey Hoser, Mark Bitterlich seems to be the electron guru around here and if you say some nice things about the most elite fighting force in the world he might answer. I don't think it's unrealistic to have voltage spikes. Would it be possible to put a transorb surge protector in the power lead for your tach? (not the P-lead connection). Don't know, but I know they are cheap and you can get them at radio shack. Glad to hear the instrument has some built in protection..pretty pricey What you been up to? Semper Fi, Wiz -------- Keith McKinley 700HS KFIT Read this topic online here: http://forums.matronics.com/viewtopic.php?p=273004#273004


    Message 2


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    Time: 06:36:36 AM PST US
    Subject: Re: generator question
    From: "keithmckinley" <keith.mckinley@townisp.com>
    Good point Dennis considering when this happens. For the record I still think that anything that creates electricity can create a voltage spike. Might not trash your stuff outright but overtime will ruin it. If I had some fancy EFIS on my plane I'd sure have a surge protector on it. Of course I could be wrong! K :) -------- Keith McKinley 700HS KFIT Read this topic online here: http://forums.matronics.com/viewtopic.php?p=273121#273121


    Message 3


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    Time: 07:38:10 AM PST US
    From: John Sykes <skyking1107@yahoo.com>
    Subject: Tim Gagnon
    Tim, - If you are still out there could you drop me a note.- This is in regard t o the 359th Fighter Group. - John Sykes skyking1107@yahoo.com


    Message 4


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    Time: 08:21:07 AM PST US
    Subject: The future of Nanchangs?
    From: "Pete Fowler" <pfdesign1@cox.net>
    Over the last couple of months, as I get closer to buying a Nanchang, I started to get the uncomfortable feeling that I'm coming in to the "market" too late and the Housai, (and even MP14) motors are going to become either unavailable or so expensive in, say, 5-10 years (the period of most use of my plane) that at the end, the plane will be worth 0 because of the unavailability or astronomical expense of replacement motors for my use or the next owner. Now, with the MP14, I see that an infrastructure is going to be there to rebuild motors (at a high cost). The Housai appears to have no such future. What is the list's thinking on this subject? I want to think well down the road before I purchase my Nanchang. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=273151#273151


    Message 5


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    Time: 08:39:54 AM PST US
    From: RAMPEYBOY@aol.com
    Subject: Re: The future of Nanchangs?
    I'm not a owner, or at this point even a prospective owner. But the question posted made me wonder if the Nanchang could be re engined? Obviously the MP14 has been done. But what about say a R-985? Too big? Too costly? Any other options? Maybe if Rotec continues to develop their radials for more power? _Rotec Radial Engines Round Engines R2800 R3600 Rotecradial_ (http://www.rotecradialengines.com/) Currently the big engine only puts out 150hp. But, maybe add another row of cylinders? Might get it close to the Nanchang's power? Boyce


    Message 6


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    Time: 08:53:11 AM PST US
    From: "Jim Selby" <alikatz@mbay.net>
    Subject: Re: The future of Nanchangs?
    Pete, Great question, nobody knows what's going to happen 5 or 10 years down the Road. The CJ's are still being built today, which means the chinese have to support them, Doug Sapp is the Biggest Supplier of the CJ Parts, I have parts that I've brought in for my Dads Aircraft and a few aircraft here on the field. When the Chinese or Russians start offering Parts at a ridiculous cost and nobody jumps on thier offer, eventually they're going to need to wake up and start working with us as they have in the Past.. I personally don't think you're jumping into the CJ/Yak community or " market " as you put it, too late, infact I think it's a really good time to jump in and get the Plane that fits your needs. Again, I know Bob really well, I know he keeps his plane in excellent Shape, as I mentioned earlier, he has a Factory Overhauled Engine on it, the Engine will probably outlast all of us as long as you take care of it. I hope this helps. Best Regards Jim ----- Original Message ----- From: "Pete Fowler" <pfdesign1@cox.net> Sent: Monday, November 16, 2009 8:20 AM Subject: Yak-List: The future of Nanchangs? > > Over the last couple of months, as I get closer to buying a Nanchang, I > started to get the uncomfortable feeling that I'm coming in to the > "market" too late and the Housai, (and even MP14) motors are going to > become either unavailable or so expensive in, say, 5-10 years (the period > of most use of my plane) that at the end, the plane will be worth 0 > because of the unavailability or astronomical expense of replacement > motors for my use or the next owner. > > Now, with the MP14, I see that an infrastructure is going to be there to > rebuild motors (at a high cost). The Housai appears to have no such > future. > > What is the list's thinking on this subject? I want to think well down the > road before I purchase my Nanchang. > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=273151#273151 > > >


    Message 7


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    Time: 06:35:36 PM PST US
    From: Yak Pilot <yakplt@yahoo.com>
    Subject: Re: generator question
    Hi Keith, thanks for the compliment.- My professional field is indeed ele ctronics, with RF as the strong suite, but let me tell you, there are a few guys hanging around this list that are smart enough to keep their mouth sh ut, but never-the-less are highly regarded experts in their field.- Rob R owe is one, and when he opens his mouth, I listen closely.- Another gent owns his own company, has a PhD, and develops a whole plethora of products. - That said, just about any time in my life I feel I am starting to get p retty good at something, I get a lesson in humility from someone who is REA LLY good.- .- - Also you're right.- Say a few good words about the USMC, and I will alway s come out of the wood-work.- I have been absent from this list for awhil e as I have been- going to school on long and short baseline interferomet ry.- Another lesson in how much more math I need.- - In answer to the original question that dealt with the over-voltage conditi on shutting down the tach.- Hmmm..... seems unlikely to me.- The YAK se ries of aircraft has a built in over-voltage device ALREADY.- If you exce ed 32 volts, it trips a circuit breaker and removes field excitation to the generator, effectively shutting it off.- Further, even if that was defec tive, running over 32 volts DC in your aircraft for any effective period of time would pretty much boil the electrolyte out of your batteries pretty d arn quick.- Then we have Dennis's comments, which were are as usual, dead on.- Of course you can check your actual voltage right in the cockpit wi th your volt/ammeter!- Only takes a second to do that.- So couple that check, with the built in over-voltage protection our aircraft have, and I h ave a hard time really believing the problem with the tach is an over-volta ge condition.- - That said, there are a lot of other issues that are possible.- I would su ggest first that the gent check his battery voltage BEFORE he goes flying. - After the aircraft has sat for awhile, check it and make sure it is 24 volts and not less.- If it is, then he has bad batteries, and the generat or is going to be trying to constantly charge them.- This will result in a higher noise output from the generator.- The more current it produces, the more noise it will create.- This is a real shotgun comment of course. - But it is a valid test.- - If I were to make a wild ass guess, it would be that this particular tach m ight indeed be "not quite right".-- As in... the people that make it al ready admit- that it has an over-voltage shut-down mode.- That means tw o things can make it shut off.- - 1.- An aircraft over-voltage. 2.- Something wrong with the over-voltage circuit in the tach itself!- - It might be number 2.- - Hey, if you really want to know... just do exactly as Dennis suggested.- Put a good voltmeter on the DC line (the battery is a good place), and meas ure the voltage before you start, then after with the engine run up as far as you want to stand there and get beat to death by the prop blast!- But. .. get it up to about 75% or so at least.- Make sure that you watch the v oltage come up to between 27-29 VDC and then STABILIZE.- In other words, it should reach a top limit and then STOP going UP as you increase engine R PM.- If it goes up steadily with engine RPM as you pass 75%, then somethi ng is bad wrong.- - Voltage spikes:- Sure Keith, voltage spikes are indeed a bad thing, and i n fact if you are concerned about them, adding a metal oxide varistor, or " trans-sorb" is indeed do-able.- However, voltage spikes are typically cau sed by large inductive loads.- The collapsing magnetic fields are the cau se... and the biggest cause of those puppy dogs are STARTER MOTORS.- Some thing the Yak happens to be missing!-- Honestly I can't think of too ma ny inductive loads in a Yak (as in motors and stuff like them... INVERTER m otor excepted!), so it comes back to the generator itself.- Generators do n't usually put out nasty spikes, unless they are defective.- As in... re ally bad brushes.-- - Bad brushes could INDEED cause the problem noted with the TACH shutting off , but it is really low on my personal list of "could this be it?"-- Nor mally if you have brushes THAT bad, you are going to hear it in your radio. - - I've installed the-P-1000 Tach on a few aircraft and have never seen this problem before, and my off the record personal guess is ... it may be the tach... but only if I personally ran all the other tests suggested first an d they all came back negative.- - Bottom line Keith, your comment about voltage spikes is perfectly true, but not really a concern (in my humble opinion) with the YAK model aircraft. - On the other hand, to prove your point as being VALID, you might be int erested to know that in a lot of CESSNA model aircraft, they have two DC bu s controls.- MAIN and AVIONICS.-- When the starter motor is engaged, the AVIONICS BUS is turned OFF, for exactly the reason you were concerned a bout.- - Best Regards, - Mark Bitterlich (writing from my hangar email account)- - p.s.- Computing phase matched cells with simultanious short and long base d interferometery is really stretching my remaining gray matter.- - --- On Mon, 11/16/09, keithmckinley <keith.mckinley@townisp.com> wrote: From: keithmckinley <keith.mckinley@townisp.com> Subject: Yak-List: Re: generator question > Good point Dennis considering when this happens. For the record I still thi nk that anything that creates electricity can create a voltage spike. Might not trash your stuff outright but overtime will ruin it. If I had some fan cy EFIS on my plane I'd sure have a surge protector on it. Of course I could be wrong!- K - :) -------- Keith McKinley 700HS KFIT Read this topic online here: http://forums.matronics.com/viewtopic.php?p=273121#273121 le, List Admin.


    Message 8


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    Time: 07:04:26 PM PST US
    From: Yak Pilot <yakplt@yahoo.com>
    Subject: Re: DC-3 Pilot in the News
    SO...... an Airline Transport Pilot, ... in fact one who flies for Delta, a company that is not known to hire idiots.... who is also rated in a DC3, =C2- shuts down a whole airport, tries to run over police officers... and Oh my GOOD GOD.... "refuses to sign a=C2- ticket".=C2-=C2- WOW!=C2 - =C2- Well hell yes, SHOOT THAT SORRY PIECE OF ... well...=C2- never mind.=C2 - =C2- =C2- Having had some personal experience with: =C2- 1.=C2- The news media. 2.=C2- Airport Administrators.=C2- 3.=C2- Local police departments.=C2- =C2- I would bet a LARGE sum of money that this is a rather trumped up set of ch arges because someone had the outright gall not to be totally subservient t o a Law Enforcement Officer or better yet....=C2-God Forbid..... a=C2- freaking Building Inspector !!=C2- =C2- =C2-STOP RIGHT THERE YOU SORRY PIECE OF TRASH, GET DOWN IN THE DIRT AND P UT YOUR HANDS BEHIND YOU HEAD,=C2- DON'T YOU KNOW I AM THE LOCAL BUILDING INSPECTOR?=C2-=C2- Yeah... right.=C2- =C2- Sorry Yak List Readers.... but this kind of news report just really fries m y ass.=C2- =C2- Putting it simply.=C2- =C2- I DO NOT BELIEVE IT.=C2-=C2-=C2- Oh yeah, it happened.. .but not like it has been reported here.=C2- No way on God's Green Earth.=C2- =C2- Of course, I could be wrong, but I really freaking doubt it.=C2-=C2- So rry, just my "BS meter" over-flowing and using the YAK List to vent.=C2- =C2- My sincere apologies. =C2- =C2- =C2- Mark Bitterlich =C2- --- On Fri, 11/13/09, N642K <mdecanio@mac.com> wrote: From: N642K <mdecanio@mac.com> Subject: Yak-List: DC-3 Pilot in the News Jailed Delta pilot suspended Man accused of trying to run over Griffin police with his private plane. By Megan Matteucci The Atlanta Journal-Constitution Friday, November 13, 2009 Delta Air Lines has suspended a pilot while officials investigate charges h e tried to run over two Griffin police officers with his private plane. Dan Wayne Gryder, 48, remains in the Spalding County jail, charged with two counts of aggravated assault and obstruction. He is being held without bon d and is scheduled to be arraigned on Friday, the sheriff=99s office said. Gryder, a Delta pilot and private aircraft instructor, was arrested Wednesd ay at the Griffin-Spalding Airport. =9CHe is suspended pending the completion into the investigation in t his incident,=9D Delta spokesman Anthony Black said Thursday. Griffin code enforcement officers were called to the airport Wednesday on a report of a pilot disrupting the airport. Gryder was driving his car acros s the runway and taxiway, Griffin Police Investigator Bryan Clanton said. Police said the suspect gave two officers a fake name. After learning the p ilot was Gryder, the officers tried to issue citations, police said. Gryder refused to sign the tickets and boarded his plane, a 1937 DC-3A, pol ice said. He started the engine and told one officer that if she moved, he would strike her car, police said. The officer, who was standing next to the plane, moved out of the way and s ummoned backup. More Griffin officers and Spalding County deputies flooded the area and ord ered him to stop, but Gryder continued to taxi down the runway, police said . Gryder got to the end of the runway and tried to take off, but he was out o f gas. Police arrested Gryder and took him to jail. Gryder=99s actions disrupted air traffic, prohibiting flights from de parting or arriving, police said. =9CHe essentially shut the airport down for almost 45 minutes, =9D Clanton said. =9CHis actions created a danger for all of our offi cers, himself and others who lawfully use the airport.=9D Read this topic online here: http://forums.matronics.com/viewtopic.php?p=272747#272747 h -- EE Gifts!) on om =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. S WEB FORUMS -


    Message 9


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    Time: 07:31:18 PM PST US
    Subject: Re: generator question
    From: "keithmckinley" <keith.mckinley@townisp.com>
    Great Post Mark, Whenever I read posts from the technical Hardballers on this board (you, Dennis, Richard, Doug, et al) if feel like Forest Gump! In any case, my Trons are in good shape and for what its worth both Mike and I have CJ's. I think Mike, being in Canada, is just too damn close to magnetic north and that's his problem... BTW, this post will be going in my personal save file! Thanks Semper Fi Jarhead, Wizard[/b] -------- Keith McKinley 700HS KFIT Read this topic online here: http://forums.matronics.com/viewtopic.php?p=273240#273240


    Message 10


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    Time: 07:45:57 PM PST US
    From: "Jim Griffin" <jgriffint28@cox.net>
    Subject: Re: generator question
    To reinforce Mark's comment about checking the battery, I found that my Horizon tach would intermittently shut down and recycle when I had a bad battery. This has happened on 2 occasions. Jim Griffin ----- Original Message ----- From: Yak Pilot To: yak-list@matronics.com Sent: Monday, November 16, 2009 8:34 PM Subject: Re: Yak-List: Re: generator question Hi Keith, thanks for the compliment. My professional field is indeed electronics, with RF as the strong suite, but let me tell you, there are a few guys hanging around this list that are smart enough to keep their mouth shut, but never-the-less are highly regarded experts in their field. Rob Rowe is one, and when he opens his mouth, I listen closely. Another gent owns his own company, has a PhD, and develops a whole plethora of products. That said, just about any time in my life I feel I am starting to get pretty good at something, I get a lesson in humility from someone who is REALLY good. . Also you're right. Say a few good words about the USMC, and I will always come out of the wood-work. I have been absent from this list for awhile as I have been going to school on long and short baseline interferometry. Another lesson in how much more math I need. In answer to the original question that dealt with the over-voltage condition shutting down the tach. Hmmm..... seems unlikely to me. The YAK series of aircraft has a built in over-voltage device ALREADY. If you exceed 32 volts, it trips a circuit breaker and removes field excitation to the generator, effectively shutting it off. Further, even if that was defective, running over 32 volts DC in your aircraft for any effective period of time would pretty much boil the electrolyte out of your batteries pretty darn quick. Then we have Dennis's comments, which were are as usual, dead on. Of course you can check your actual voltage right in the cockpit with your volt/ammeter! Only takes a second to do that. So couple that check, with the built in over-voltage protection our aircraft have, and I have a hard time really believing the problem with the tach is an over-voltage condition. That said, there are a lot of other issues that are possible. I would suggest first that the gent check his battery voltage BEFORE he goes flying. After the aircraft has sat for awhile, check it and make sure it is 24 volts and not less. If it is, then he has bad batteries, and the generator is going to be trying to constantly charge them. This will result in a higher noise output from the generator. The more current it produces, the more noise it will create. This is a real shotgun comment of course. But it is a valid test. If I were to make a wild ass guess, it would be that this particular tach might indeed be "not quite right". As in... the people that make it already admit that it has an over-voltage shut-down mode. That means two things can make it shut off. 1. An aircraft over-voltage. 2. Something wrong with the over-voltage circuit in the tach itself! It might be number 2. Hey, if you really want to know... just do exactly as Dennis suggested. Put a good voltmeter on the DC line (the battery is a good place), and measure the voltage before you start, then after with the engine run up as far as you want to stand there and get beat to death by the prop blast! But... get it up to about 75% or so at least. Make sure that you watch the voltage come up to between 27-29 VDC and then STABILIZE. In other words, it should reach a top limit and then STOP going UP as you increase engine RPM. If it goes up steadily with engine RPM as you pass 75%, then something is bad wrong. Voltage spikes: Sure Keith, voltage spikes are indeed a bad thing, and in fact if you are concerned about them, adding a metal oxide varistor, or "trans-sorb" is indeed do-able. However, voltage spikes are typically caused by large inductive loads. The collapsing magnetic fields are the cause... and the biggest cause of those puppy dogs are STARTER MOTORS. Something the Yak happens to be missing! Honestly I can't think of too many inductive loads in a Yak (as in motors and stuff like them... INVERTER motor excepted!), so it comes back to the generator itself. Generators don't usually put out nasty spikes, unless they are defective. As in... really bad brushes. Bad brushes could INDEED cause the problem noted with the TACH shutting off, but it is really low on my personal list of "could this be it?" Normally if you have brushes THAT bad, you are going to hear it in your radio. I've installed the P-1000 Tach on a few aircraft and have never seen this problem before, and my off the record personal guess is ... it may be the tach... but only if I personally ran all the other tests suggested first and they all came back negative. Bottom line Keith, your comment about voltage spikes is perfectly true, but not really a concern (in my humble opinion) with the YAK model aircraft. On the other hand, to prove your point as being VALID, you might be interested to know that in a lot of CESSNA model aircraft, they have two DC bus controls. MAIN and AVIONICS. When the starter motor is engaged, the AVIONICS BUS is turned OFF, for exactly the reason you were concerned about. Best Regards, Mark Bitterlich (writing from my hangar email account) p.s. Computing phase matched cells with simultanious short and long based interferometery is really stretching my remaining gray matter. --- On Mon, 11/16/09, keithmckinley <keith.mckinley@townisp.com> wrote: From: keithmckinley <keith.mckinley@townisp.com> Subject: Yak-List: Re: generator question To: yak-list@matronics.com Date: Monday, November 16, 2009, 9:34 AM <keith.mckinley@townisp.com> Good point Dennis considering when this happens. For the record I still think that anything that creates electricity can create a voltage spike. Might not trash your stuff outright but overtime will ruin it. If I had some fancy EFIS on my plane I'd sure have a surge protector on it. Of course I could be wrong! K :) -------- Keith McKinley 700HS KFIT Read this topic online here: http://forums.matronics.co; (And Get Some AWESOME FREE Gifts!); http://; -Matt Dralle, List Admin.p; -->




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