---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Wed 02/15/17: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:23 AM - Thread comments (Jill Gernetzke) 2. 06:23 AM - Thread comments (Jill Gernetzke) 3. 11:30 AM - Re: YAK55m wing bolt replacement (Walter Lannon) 4. 01:14 PM - Re: Yak 18T for sale (Yakbaas) 5. 07:04 PM - Re: Artificial Horizon (Adrian Hale) ________________________________ Message 1 _____________________________________ Time: 06:23:23 AM PST US From: "Jill Gernetzke" Subject: Yak-List: Thread comments Group, 1. Re: Yak 55 Wing bolts - Steve, I will contact you off-list. 2. M-14P, Series II: Nosecase- Richard is correct. OKBM instituted the change for the centrifugal oil filter and found that the drive failed. This is what were told when Carl and I went through the factory overhaul course at OKBM in Voronezh in 2001. In addition, the drive gears were redesigned in the accessory section and the "bridges" in the casting of the accessory section from Series I to Series II. 3. M-14P Overhaul time: We received an engine from a customer that had flown 2200+ hours on a new engine purchased from Carl, with no major work on the engine. He maintained the engine to a high standard. That said, the cylinders showed the long-term effects. There were 2 cylinders with exhaust guides that were loose in the cylinder head. The cylinder work is the most expensive part of the engine overhaul process. I would not advise going this long before overhaul. Original, new exhaust valves are expensive and not readily available. Fortunately, we have built our stock of these parts over the past 25 years. The biggest determining factors on engine life is how the engine is flown, as Richard mentioned, and how it is maintained. There is a class of owners that will run the poor engine until there is a failure, when they need to be tending to it with a little bit of TLC. I often wonder if they treat their spouses or significant others in this same fashion. If you take care of it, it will take care of you. I am not going to get into a lengthen discussion at the moment, but I will write an article in the future about overhaul times, costs, upgrades and choices. It will also include our recommendations for accessory overhaul times; which are earlier than an engine TBO. Fly safe, have fun. Jill M-14P, Inc. 4905 Flightline Drive Kingman, AZ 86401 928-681-4400 www.m-14p.com ________________________________ Message 2 _____________________________________ Time: 06:23:33 AM PST US From: "Jill Gernetzke" Subject: Yak-List: Thread comments Group, 1. Re: Yak 55 Wing bolts - Steve, I will contact you off-list. 2. M-14P, Series II: Nosecase- Richard is correct. OKBM instituted the change for the centrifugal oil filter and found that the drive failed. This is what were told when Carl and I went through the factory overhaul course at OKBM in Voronezh in 2001. In addition, the drive gears were redesigned in the accessory section and the "bridges" in the casting of the accessory section from Series I to Series II. 3. M-14P Overhaul time: We received an engine from a customer that had flown 2200+ hours on a new engine purchased from Carl, with no major work on the engine. He maintained the engine to a high standard. That said, the cylinders showed the long-term effects. There were 2 cylinders with exhaust guides that were loose in the cylinder head. The cylinder work is the most expensive part of the engine overhaul process. I would not advise going this long before overhaul. Original, new exhaust valves are expensive and not readily available. Fortunately, we have built our stock of these parts over the past 25 years. The biggest determining factors on engine life is how the engine is flown, as Richard mentioned, and how it is maintained. There is a class of owners that will run the poor engine until there is a failure, when they need to be tending to it with a little bit of TLC. I often wonder if they treat their spouses or significant others in this same fashion. If you take care of it, it will take care of you. I am not going to get into a lengthen discussion at the moment, but I will write an article in the future about overhaul times, costs, upgrades and choices. It will also include our recommendations for accessory overhaul times; which are earlier than an engine TBO. Fly safe, have fun. Jill M-14P, Inc. 4905 Flightline Drive Kingman, AZ 86401 928-681-4400 www.m-14p.com ________________________________ Message 3 _____________________________________ Time: 11:30:03 AM PST US From: "Walter Lannon" Subject: Re: Yak-List: YAK55m wing bolt replacement Hi Royden; Wow! Trying to work all that out would give me a massive headache; well done, mine was just a wild ass guess. Would not be surprised if the spar is titanium but would not expect the wing attach fittings to be, though I do not know and understand Russia has been a leader in Ti technology for many years. The bolt of course is the least critical factor in this type of joint. It is loaded is double shear and, in this, is able to exceed the UTS of the attaching straps which are loaded in pure tension. Industry standard for the bolt repair/oversize is grind, hard chrome plate, stress relief and grind to size. As you noted these are high quality aerospace standard bolts. If, as I suspect, the straps are high strength steel in excess of 170 Kips (could be as high as 200!) the chances of successful line reaming are slim to none. Well, maybe with a 17 flute reamer?? The tensile load on the straps is concentrated in two distinct areas: 1. Shear out - compensated for at manufacture by increasing the material between the hole and the strap end. 2. The combined area at upper and lower (90 deg.) hole extremities; the amount of material remaining here will determine the max. hole dia. which will be in the structural repair manual. Cheers Walt ps. I don't even know if Ti is ferrous! I would think not. If not check with a magnet. -----Original Message----- From: Royden Heays Sent: Tuesday, February 14, 2017 10:14 PM Subject: RE: Yak-List: YAK55m wing bolt replacement Hi Steve, I'm told that the main spar wing and fuselage fittings are titanium. Those fittings take on an oval shape with long term aerobatic loadings while the bolt remains perfectly circular at its original diameter. The fix is to ream the fittings and install over- sized bolts to match. Reaming titanium is not an easy matter and doing it while keeping the holes aligned so as not to change the rig is an added challenge. I was told you need a 17 flute reamer. There are two ways of getting oversized bolts. One is to build up the existing bolts and grind them back to the oversize diameter needed. The other is to order oversized bolts from the Yak 55 factory in Eastern Russia. As of two years ago Vladimir Yestremi had the equipment and contacts to do the whole job. I'm not sure if Vladimir is still in that business. Jill and Carl at M14P also have knowledge of the process. Jill - are you there - can you please comment? I did some calcs a couple of years ago as attached. Walt's 30 tons (imperial tons?) is pretty close to the 28 T (metric tons) I calculated. I'm not an aircraft engineer and don't stand behind the calcs. But they certainly convinced me to be very wary of having the right bolt strength. They are high end bolts that are required. Hopefully Vladimir reads this and can correct me if needed. Regards Royden -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Walter Lannon Sent: Tuesday, February 14, 2017 8:10 PM Subject: Re: Yak-List: YAK55m wing bolt replacement Hi Steve; I have no specific information to offer you on the Yak 55 wing attachment, only a few general observations: The wing attach straps are not castings. These are high strength steel forgings, probably a Russian equivalent of AMS 4340 (or similar) and heat treated to a minimum UTS (ultimate tensile strength) of not less than 170,000 psi. The factory manual may allow the use of an oversize bolt (factory supplied) with rework of the fittings possibly by precision grinding rather than reaming. The maximum increase in hole dia. will likely be in the order of 0.25 - 0.5 mm (0.010 - 0.020 in.) A typical maximum clearance between the bolt and wing fitting would be in the order of 0.05 mm (0.002 in). If you know a good professional engineer have him do some measurements and calculate the lower attachment load at your normal (positive) max. "G" load. He will probably give you a number around 30 ton. Fly safe; Walt -----Original Message----- From: Steve Geard Sent: Tuesday, February 14, 2017 12:22 AM Subject: Yak-List: YAK55m wing bolt replacement Hello all my 1992 YAK55m has 440 hours on it and is showing signs of play in both the front and rear wing attachments. Has anyone done a replacement of wing bolts? We're thinking if we reamed the holes oversize and bush them back to standard size all we need to do is refit original type bolts, also any future repair means replacing bush only. Also does anyone know what the attachments castings are made from :-) And whats the maximum oversize we can bore out to? Cheers Steve. Life's short fly aerobatics. -------- SteveO Read this topic online here: http://forums.matronics.com/viewtopic.php?p=466164#466164 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 4 _____________________________________ Time: 01:14:31 PM PST US Subject: Yak-List: Re: Yak 18T for sale From: "Yakbaas" I can reduce to $48k . Need to sell :( :( Read this topic online here: http://forums.matronics.com/viewtopic.php?p=466251#466251 ________________________________ Message 5 _____________________________________ Time: 07:04:00 PM PST US From: Adrian Hale Subject: Re: Yak-List: Artificial Horizon I have several, not sure of part numbers between yak and CJ, if you can tell me the number of pins on the connector, I can tell you which ones will fit your aircraft, at least, two are fresh out of the shop, others serviceable when removed. Sent from my iPad > On Jan 28, 2017, at 1:56 PM, Jim Selby wrote: > > > Good morning, > I have a gentleman looking for 2ea. Artificial Horizons for their CJ-6, please contact me off list if you know anyone that might have one or two available ( working condition). Thank you, > > Best Regards > Jim Selby Jr. > > Sent from my iPhone > >> On Jan 28, 2017, at 12:03 AM, Yak-List Digest Server wrote: >> >> * >> >> ================================================= >> Online Versions of Today's List Digest Archive >> ================================================= >> >> Today's complete Yak-List Digest can also be found in either of the >> two Web Links listed below. The .html file includes the Digest formatted >> in HTML for viewing with a web browser and features Hyperlinked Indexes >> and Message Navigation. The .txt file includes the plain ASCII version >> of the Yak-List Digest and can be viewed with a generic text editor >> such as Notepad or with a web browser. >> >> HTML Version: >> >> http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 17-01-27&Archive=Yak >> >> Text Version: >> >> http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 17-01-27&Archive=Yak >> >> >> =============================================== >> EMail Version of Today's List Digest Archive >> =============================================== >> >> >> ---------------------------------------------------------- >> Yak-List Digest Archive >> --- >> Total Messages Posted Fri 01/27/17: 3 >> ---------------------------------------------------------- >> >> >> Today's Message Index: >> ---------------------- >> >> 1. 07:35 AM - Warbird Camping @ OSH (Rico Jaeger) >> 2. 03:41 PM - Re: Nanchang Company, M14P approval (Ttail) >> 3. 04:02 PM - CJ6 Neutral Trim light (Ttail) >> >> >> >> ________________________________ Message 1 _____________________________________ >> >> >> Time: 07:35:11 AM PST US >> From: Rico Jaeger >> Subject: Yak-List: Warbird Camping @ OSH >> >> Did any of you happen to receive / see the new proposed camping fee / reser >> vation email from EAA / Warbirds? Is it yet another attempt at gouging and >> extortion or am I just bloated and over-sensitive this week...??? >> >> >> Rico Jaeger >> 915 S. 11th Ave. >> Wausau, WI. 54401 >> 715.529.7426 >> // >> 1969 Cessna 150J ^/---//-X >> N61333 // >> Hangar #35 / AUW >> // >> 1992 Yakovlev Yak 52 ^/---//-X >> N21YK // >> Hangar #21 / AUW >> >> >> ________________________________ Message 2 _____________________________________ >> >> >> Time: 03:41:57 PM PST US >> Subject: Yak-List: Re: Nanchang Company, M14P approval >> From: "Ttail" >> >> >> Hope this helps I got hold of a copy of this letter from an engineer here in Australia >> before putting an M14PF in my CJ6A >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=465491#465491 >> >> >> ________________________________ Message 3 _____________________________________ >> >> >> Time: 04:02:12 PM PST US >> Subject: Yak-List: CJ6 Neutral Trim light >> From: "Ttail" >> >> >> Searched through the various manuals and couldn't find anything on where and how >> to set up the Neutral Elevator trim like on the CJ6. Anyone have anything on >> this ? >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=465492#465492 >> >> >> >> >> >> >> >> > > > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.