Yak-List Digest Archive

Sat 06/08/13


Total Messages Posted: 15



Today's Message Index:
----------------------
 
     1. 12:46 AM - Re: External Camera mounts (ssssskippy)
     2. 12:48 AM - Re: External Camera mounts (Olivier Vigneron)
     3. 05:08 AM - Re: External Camera mounts (Javier Carrasco)
     4. 06:04 AM - Re: RU check valves removed from pop off valve assembly (Roger Kemp M.D.)
     5. 07:03 AM - Re: External Camera mounts (keithmckinley)
     6. 07:08 AM - CJ Prop Nut (keithmckinley)
     7. 08:57 AM - FW: Pay atttention! (Bitterlich, Mark G CIV NAVAIR, WD)
     8. 08:57 AM - Re: Air system 'stuff' (Bitterlich, Mark G CIV NAVAIR, WD)
     9. 09:08 AM - Manifold pressure cont. (Dr. Robert Schroeder)
    10. 09:20 AM - Re: Air system 'stuff' (Bitterlich, Mark G CIV NAVAIR, WD)
    11. 12:13 PM - Re: CJ Prop Nut (Walter Lannon)
    12. 12:46 PM - Re: Hydraulic Lock (Elmar & Manuela Hegenauer)
    13. 03:02 PM - Re: Re: External Camera mounts (Bill Geipel)
    14. 03:31 PM - Re: CJ Prop Nut (keithmckinley)
    15. 07:45 PM - Re: Re: External Camera mounts (Herb Coussons)
 
 
 


Message 1


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    Time: 12:46:25 AM PST US
    Subject: Re: External Camera mounts
    From: ssssskippy <ssssskippy@gmail.com>
    I tried this GoPro location.... Not too good because each Time you roll, you puke a glass of oil on the camera Lens :-) Olivier V Le 8 juin 2013 01:45, Byron Fox <byronmfox@gmail.com> a crit : > Craig here's my cheap PVC tail mount. Wing and turtle deck mounts follow. > > <image.jpeg> > > Blitz Fox > 415-307-2405 > > On Jun 7, 2013, at 4:26 PM, Cpayne <cpayne@joimail.com> wrote: > >> >> I'm looking to acquire an externally mounted "Go-Pro" type camera to photo some tuft testing. Looking for recommendations. I'm talking cheap here, all I need is timed sequence stills. I'm leery of suction cup mounts. Has anyone used one mounted on the airframe at speeds over 180 knots? >> >> Craig Payne >> > =================================== > =================================== > =================================== > =================================== >> >> >> > > <pre><b><font size=2 color="#000000" face="courier new,courier"> > > > </b></font></pre>


    Message 2


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    Time: 12:48:41 AM PST US
    Subject: Re: External Camera mounts
    From: Olivier Vigneron <ssssskippy@gmail.com>
    I use to mount this rollbar adaptator on the pitot tube! Works great! I tested it till 380km/h without any problem! * http://cbcdn2.gp-static.com/uploads/product_photo/image/27204/684x426_RollBarMount684x426b.jpg * 2013/6/8 Cpayne <cpayne@joimail.com> > > I'm looking to acquire an externally mounted "Go-Pro" type camera to photo > some tuft testing. Looking for recommendations. I'm talking cheap here, all > I need is timed sequence stills. I'm leery of suction cup mounts. Has > anyone used one mounted on the airframe at speeds over 180 knots? > > Craig Payne > >


    Message 3


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    Time: 05:08:54 AM PST US
    From: Javier Carrasco <javiercarrascob@yahoo.com>
    Subject: Re: External Camera mounts
    I'm using the same go pro big handle bar, it holds up to 9g's and 380 kms: http://www.youtube.com/watch?v=NplQk78Lee4 --- On Fri, 6/7/13, Bill Geipel <l129bs@gmail.com> wrote: From: Bill Geipel <l129bs@gmail.com> Subject: Re: Yak-List: External Camera mounts Very nice. Bill On Jun 7, 2013, at 7:19 PM, Robin Hou <rmhou@yahoo.com> wrote: This video was taken with my friend Jeffrey flying his CJ-6 as photo ship w ith a GoPro mounted on its pitot tube. Jimbo, our club president, then edit ed the video with music.-I think we used a Ram mount with-camera adapte r.-I don't think Jeffrey was anywhere close to 180 knt, but am sure he wa s going around 160 knt at times while flying circles around us. http://www.youtube.com/watch?v=J4Vg7lYXLS4&feature=youtu.be My father asked me to spread his ashes over the Pacific just outside=0A of Palos Verdes where my sister lives. He had taken many flight with me in my Bonanza before his passing, and this video shows how his last flight with m e was like. My friends flew formation and photo ship as a farewell to my fa ther. Robin --- On Fri, 6/7/13, Cpayne <cpayne@joimail.com> wrote: From: Cpayne <cpayne@joimail.com> Subject: Yak-List: External Camera mounts I'm looking to acquire an externally mounted "Go-Pro" type camera to photo some tuft testing. Looking for recommendations. I'm talking cheap here, all I need is timed sequence stills. I'm leery of suction cup mounts. Has anyo ne used one mounted on the airsp;---> http://for- - - - - - --- List Contribution We - - - - - - - - - - - - - - -Matt Dralle, List=0Am/contribution" target="_blank">http://w ww.matronics.com/contribution=========== =0A=0A=0A====================== ==============0A//www.matronics.com/Navigator?Yak -List=0A====================== ==============0Acs.com=0A======== ===0Amatronics.com/contribution=0A============ ========================0A=0A ==================0A=0A


    Message 4


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    Time: 06:04:06 AM PST US
    Subject: Re: RU check valves removed from pop off valve assembly
    From: "Roger Kemp M.D." <viperdoc@mindspring.com>
    If not then what is it? Doc Sent from my iPad On Jun 7, 2013, at 3:08 PM, "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil> wrote: > > CJ6 checks valves are different than YAK check valves. This is not the > pop off valve assembly. > > > -----Original Message----- > From: owner-yak-list-server@matronics.com > [mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp > M.D. > Sent: Friday, June 07, 2013 11:29 > To: yak-list@matronics.com > Subject: Yak-List: RU check valves removed from pop off valve assembly > > These are the check valves after removal from the pop off assembly. > Doc > > > > > >


    Message 5


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    Time: 07:03:11 AM PST US
    Subject: Re: External Camera mounts
    From: "keithmckinley" <cetopfed@gmail.com>
    I have a contour HD camera and I took a standard small camera swivel mount similar to the one shown. On the female end I epoxied a 4 mm screw. I can attach it anywhere there is a 4mm screw on the plane.I just use a rubber washer to protect the paint. -------- Keith McKinley 700HS X26 Sebastian, FL Read this topic online here: http://forums.matronics.com/viewtopic.php?p=402278#402278 Attachments: http://forums.matronics.com//files/242727307_540.jpeg


    Message 6


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    Time: 07:08:48 AM PST US
    Subject: CJ Prop Nut
    From: "keithmckinley" <cetopfed@gmail.com>
    Is the nut holding the prop hub on the spline shaft a standard or left handed thread? Keith -------- Keith McKinley 700HS X26 Sebastian, FL Read this topic online here: http://forums.matronics.com/viewtopic.php?p=402279#402279


    Message 7


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    Time: 08:57:33 AM PST US
    Subject: Pay atttention!
    From: "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil>
    Ok Doc. In the picture the things with the arrows on them are the check valves. Regarding check valves, I have seen three different types. Early YAK-50, Late YAK-50 and YAK-52. Then there are the ones that are on the CJ-6, which makes FOUR different types. They all perform the same function, and Western made replacements are available...a check valve is a check valve. The Coy's can rebuild these. The item on the RIGHT side of the picture is the Pressure Relief or POP-OFF valve. The top piece on that is threaded and is what you use to adjust the pressure regulation. Screw it tighter, higher pressure. Unscrew it, less pressure. If you take the top piece off, remove the piston and spring, then take Doug Sapp's CJ-6 assembly and simply screw off the top of it, and then remove it's piston and spring, all three pieces can then screw back into the original YAK pop-off valve. Mark -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp M.D. Sent: Friday, June 07, 2013 11:37 Subject: Yak-List: Pay atttention! pay attention to the direction that the check valve orientation to air flow direction. The arrow is the clue. Doc DQoNCg0KU2VudCBmcm9tIG15IGlQYWQNCjxwcmU+PGI+PGZvbnQgc2l6ZT0zRDIgY29sb3I9IiMw MDAwMDAiIGZhY2U9M0QiY291cmllciBuZXcsY291cmllciI+DQoNCl8tPTNEPTNEPTNEPTNEPTNE PTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNE PTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNE PTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEPTNEDQpfLT0z RCAgICAgICAgICAtIFRoZSBZYWstTGlzdCBFbWFpbCBGb3J1bSAtDQpfLT0zRCBVc2UgdGhlIE1h dHJvbmljcyBMaXN0IEZlYXR1cmVzIE5hdmlnYXRvciB0byBicm93c2UNCl8tPTNEIHRoZSBtYW55 IExpc3QgdXRpbGl0aWVzIHN1Y2ggYXMgTGlzdCBVbi9TdWJzY3JpcHRpb24sDQpfLT0zRCBBcmNo aXZlIFNlYXJjaCAmIERvd25sb2FkLCA3LURheSBCcm93c2UsIENoYXQsIEZBUSwNCl8tPTNEIFBo b3Rvc2hhcmUsIGFuZCBtdWNoIG11Y2ggbW9yZToNCl8tPTNEDQpfLT0zRCAgIC0tPiA8YSBocmVm PTNEImh0dHA6Ly93d3cubWF0cm9uaWNzLmNvbS9OYXZpZ2F0b3I/WWFrLUxpc3QiPmh0dHA6Ly93 d3cubWF0cm9uaWNzLmNvbS9OYXZpZ2F0b3I/WWFrLUxpc3Q8L2E+DQpfLT0zRA0KXy09M0Q9M0Q9 M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9 M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9 M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9 M0QNCl8tPTNEICAgICAgICAgICAgICAgLSBNQVRST05JQ1MgV0VCIEZPUlVNUyAtDQpfLT0zRCBT YW1lIGdyZWF0IGNvbnRlbnQgYWxzbyBhdmFpbGFibGUgdmlhIHRoZSBXZWIgRm9ydW1zIQ0KXy09 M0QNCl8tPTNEICAgLS0+IDxhIGhyZWY9M0QiaHR0cDovL2ZvcnVtcy5tYXRyb25pY3MuY29tIj5o dHRwOi8vZm9ydW1zLm1hdHJvbmljcy5jb208L2E+DQpfLT0zRA0KXy09M0Q9M0Q9M0Q9M0Q9M0Q9 M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9 M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9 M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0Q9M0QNCl8tPTNE ICAgICAgICAgICAgIC0gTGlzdCBDb250cmlidXRpb24gV2ViIFNpdGUgLQ0KXy09M0QgIFRoYW5r IHlvdSBmb3IgeW91ciBnZW5lcm91cyBzdXBwb3J0IQ0KXy09M0QgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAtTWF0dCBEcmFsbGUsIExpc3QgQWRtaW4uDQpfLT0zRCAgIC0tPiA8YSBocmVm PTNEImh0dHA6Ly93d3cubWF0cm9uaWNzLmNvbS9jb250cmlidXRpb24iPmh0dHA6Ly93d3cubWF0 cm9uaWNzLmNvbS9jb250cmlidXRpb248L2E+DQpfLT0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0z RD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0z RD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0z RD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRD0zRA0KDQo8L2I+PC9mb250Pjwv cHJlPjwvYm9keT48L2h0bWw+


    Message 8


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    Time: 08:57:58 AM PST US
    Subject: Air system 'stuff'
    From: "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil>
    Ummm.... this is what I have been saying all along. Mark -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp M.D. Sent: Friday, June 07, 2013 23:05 Subject: Re: Yak-List: Air system 'stuff' --> <viperdoc@mindspring.com> No my problem was not in the pop off valve itself. It was in the check valves. You are correct the top part of the CJ pop off valve with the piston and spring will work on the 50's base. just have to adjust the pop pressure afterward. The CJ T fitting is a male fitting at the base of the pop off valve. Doc Sent from my iPad On Jun 7, 2013, at 1:15 PM, "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil> wrote: > --> <mark.bitterlich@navy.mil> > > I own a 74 Yak-50 and an 84 Yak-50. > > The one way check valves between both aircraft are much different. The two pressure relief valves are identical on both models. > > Let me explain the process with a tad more detail as you might have missed it. > > In my 50 Doc, I could not just replace the piston. I had to replace the piston, the spring AND THE TOP SCREW ON PIECE. If you just try to replace the piston, it will not work. > > The only part of the pressure relief part that is identical is the seat, and the thread. The top parts all have to be replaced. > > Did you try that? > > Mark > > > -----Original Message----- > From: owner-yak-list-server@matronics.com > [mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp > Sent: Thursday, June 06, 2013 16:15 > To: yak-list@matronics.com > Subject: Re: Yak-List: Air system 'stuff' > > > Speaking for the 78 model 50, the internal components are not the same YAK vs the CJ. It is easy to swap the entire check valve assembly out though. That is what I did on the 50. Solved the leaking check valve at the pop off problem in about 4 hours. Just wish I had caught the airline leak at the manifold for the acutators before the gear collapsed. Would have saved a lot of headaches! > Doc > > -----Original Message----- >> From: "A. Dennis Savarese" <dsavarese0812@bellsouth.net> >> Sent: Jun 6, 2013 1:44 PM >> To: yak-list@matronics.com >> Subject: Re: Yak-List: Air system 'stuff' >> >> --> <dsavarese0812@bellsouth.net> >> >> The Yak 50 pop off valve internal components may be interchangeable >> with the Chinese components. But definitely not the Yak 52. >> Dennis >> >> A. Dennis Savarese >> 334-285-6263 >> 334-546-8182 (mobile) >> www.yak-52.com >> Skype - Yakguy1 >> >> On 6/6/2013 1:18 PM, A. Dennis Savarese wrote: >>> <dsavarese0812@bellsouth.net> >>> >>> Unfortunately, the CJ6's pressure relief valve or pop off valve's >>> internal components are not the same as the one on the 52. The >>> pistons are not interchangeable. >>> >>> If you need a new piston for a Yak 52 pop off valve, I believe Jill >>> has them and so does Cliff Coy at Border Air. The spring for the >>> 52's pop off valve may be a little harder to find. But Jill or >>> Cliff can help with that. >>> >>> We have converted a few Yak 52's to the CJ6 pop off valve assembly >>> with the two Chinese check valves because the Chinese check valves >>> are significantly less expensive and Doug typically has them or overhaul >>> kits in stock. (Thank you Doug). The Russian check valves are VERY >>> expensive, IF you can find them. >>> >>> Dennis >>> >>> A. Dennis Savarese >>> 334-285-6263 >>> 334-546-8182 (mobile) >>> www.yak-52.com >>> Skype - Yakguy1 >>> >>> On 6/6/2013 11:34 AM, Bitterlich, Mark G CIV NAVAIR, WD wrote: >>>> <mark.bitterlich@navy.mil> >>>> >>>> Just FYI. >>>> >>>> The CJ6 valve ASSEMBLY that Doug has, is not always a direct >>>> replacement for every YAK pressure relief valve. Slightly >>>> different fittings in some cases. >>>> >>>> But the answer is obvious. If you take apart HIS valve and remove >>>> the sealing piston, spring and screw on pressure adjusting top >>>> piece, and put them on yours, they fit perfectly and will work perfectly. >>>> >>>> You will then have to reset your maximum pressure. Be careful. >>>> >>>> Mark Bitterlich >>>> >>>> >>>> -----Original Message----- >>>> From: owner-yak-list-server@matronics.com >>>> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Cory >>>> Robin >>>> Sent: Thursday, June 06, 2013 1:00 >>>> To: yak-list@matronics.com >>>> Subject: Re: Yak-List: Air system 'stuff' >>>> >>>> Thank you all. I contacted Doug and have a valve on it's way. > > > > > > > > > >


    Message 9


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    Time: 09:08:13 AM PST US
    From: "Dr. Robert Schroeder" <Firedog@visi.com>
    Subject: Manifold pressure cont.
    Q: Could my noticeable change in manifold pressure be due simply to OAT change? Otherwise all mechanical appears to be in order. Thanks, ras Dr. Robert A. Schroeder Schroeder Fire Inc. 612.922.2349


    Message 10


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    Time: 09:20:17 AM PST US
    Subject: Air system 'stuff'
    From: "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil>
    Doc, The 74, 78 80 and 85 are identical when it comes to air system design and landing gear operation. Some of the parts are different, but the design and operation are the same. What are you talking about "the gear is beefier"? Where are you getting this information? I am talking YAK-50's here ok? You are passing unsupported assertions. Give me the different part numbers you are talking about. Example, my YAK-50 has Cleveland wheels and hyd. Toe brakes. That does not mean the factory put that stuff there! Regarding springs, a lot of them have been changed over the years as they have rusted out. Springs are very critical. I think you are assuming that since you see different parts on different 50's that the factory used different parts. Realize that these aircraft have gone through many owners and locations. A lot of mechs have changed parts from stock. Most especially springs. The only change in the fuel system was adding the Aux Tank. We are not talking about YAK-18A's, and we are not talking about CJ6's. We are talking about YAK-50's. Please stop misdirecting the discussion. As regards the string of events that lead to an accident, yours or anyone else's, you are absolutely correct. But I am not trying to discuss that chain of events. If you are telling me you DID check BOTH GREEN LIGHTS ON showing "down and locked" and then you tell me that BOTH gear then collapsed after landing due to some kind of air leak, that is just next to impossible. You would have to have had BOTH landing gear switches out of rig. One of them being slightly misadjusted, I could believe is possible. Both of them being out of adjustment the exact same way, to the exact same degree... the odds are next to impossible. Loss of air pressure due to WHATEVER reason... actuators, broken lines, broken chevron seals, main air valve not open, WHATEVER... can indeed caused the gear to not come down and lock. The gear can be released from the uplocks if there is ANY residual air pressure. It will then come down and kind of HANG there. It will not lock and you will not have both DOWN AND LOCKED green lights come on. This is probably what happened to you. Something similar happened to me when my left gear was not down and locked because the attach bolt had been over-tightened... main gear leg attach bolt. But that is also "another story". Regardless. Once a YAK-50 landing gear is down and locked, loss of air pressure will not cause it to collapse... .and that statement applies to every YAK-50 ever made. The reason I am posting this in public is because you are giving the impression to folks that this is not true. That loss of air pressure after the gear is down and locked CAN cause the gear to collapse after landing. I'm sorry, but leaving that kind of misinformation as truth has to be corrected. Loss of air pressure after the landing gear is down and locked on a YAK-50 will never cause the landing gear to collapse. Mark Bitterlich -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp M.D. Sent: Friday, June 07, 2013 22:54 Subject: Re: Yak-List: Air system 'stuff' --> <viperdoc@mindspring.com> Don't know Mark. To use a famous quote, " It just went blew!" Is the 74 the same as the 78 as the 80 as the 85? No. The gear is beefier on the 85 than the 78 for one. My mechanical lock spring is not as hefty as the 85's either. The fuel system is different also. I know that from crawling around on the 85 sitting in the back of my hanger. The 85 has better lateral stability than than the 78 slick wing that I have...had. The 78's actuator as you say does not have the ball check valve. It uses air to push and pull applied at either end of the actuator. As I said my spring is smaller than that on the 85. And all I can tell for a heart beat there I saw a wind screen full of green as the nose went down. One blade is shorter than the other as well as it sheered off just inside the cowl diameter and I have dirt up in my hub. The CJ nose strut actuator will work on the 78 is another difference. The CJ actuator is the same as the YAK 18A's. I don't know if they will work on the later model 50's. One of my air lines has 04 on it and the other has 02 on it. The lines to the actuators have faded enough that I can not read them. So again this was my error in not replacing them sooner. I can tell you all incidents or accidents start as a series of small events that lead up the big event. Just need to break the cycle to prevent the incident. I did not catch the series. If I had listened to that little internal voice that said taxi into your ramp and shut down as I taxied by after fueling up we would not be having this conversation. If I had not been pressed to beat a TFR, we would not be having this conversation. If I had not checked the main air valve before TO, we would not be having this conversation. If weather had not become a factor in route going from marginal VFR to IFR resulting in my turning back, we would not be having this conversation. But then again had I landed on concrete instead of grass I may not have been here any longer and we would not be having this conversation for sure. If I had squeezed the brake handle and release it before turning the air on to start after priming we would not be having this conversation. Hide sight is always 20/20 as are arm chair quarterbacks. Doc Sent from my iPad On Jun 7, 2013, at 2:00 PM, "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil> wrote: > --> <mark.bitterlich@navy.mil> > > Doc, you said that you wished you had caught the airline leak at the manifold for the actuators before the landing gear collapsed. > > I'm kind of confused by that statement, and it brings up an important point. The YAK-52 (I say again YAK-52!!) uses an internal ball lock assembly internal to the actuators. If those are in bad shape and you lose pressure to the landing gear ..... the gear can collapse. I've seen it happen three times on one YA-52 before the owner finally got the actuators repaired. > > However, the YAK-50 (I say again YAK-50) does not work like that. It uses an EXTERNAL LOCKING device that is purely mechanical in nature. Once the landing gear comes down, you can remove all pressure from the pneumatic system and land safely with no possibility of the gear collapsing. In fact that is a good safety procedure for every YAK-50 owner to know, which is why I am writing this. If you can get the gear down on a YAK-50 that has an internal air leak, you can then place the gear handle back into the MIDDLE position, which isolates pneumatic pressure from the landing gear system, and allows the engine air compressor to pump back up to 50 atmos on BOTH the main and emergency bottle. This then allows you to land with full pressure available to the BRAKES! I flew a YAK-50 almost all the way from the east coast to Ramona California that way (for Vladimir Yastremski). It had a bad air leak when the gear went down, enough so that I would have had to land with no brak! es! > available. This method is not documented, but trust me when I say I am 100% sure of how this works. It could be considered an Emergency Procedure. > > Moving on, I would assume that during every Conditional Inspection on your aircraft, you swing the gear. Part of that inspection is to make sure that the landing gear lights do not show down and locked BEFORE the landing gear is actually DOWN AND LOCKED! I.E. You don't want to have the gear lights indicate it is down, when it is actually NOT down. This requires the landing gear to be lowered very slowly with a steady hand on the master air valve, while one person watches the lights and another person watches the external locking block snap into place. > > So assuming that your landing gear indication switches were properly adjusted, then any kind of airline leak ANYWHERE in the system would not cause the gear to collapse once it indicated down and locked. > > What this means is that if your gear collapsed upon or after landing, then they were never down and locked to begin with and you probably missed the fact that both green lights were not lit, or you heard what you thought were normal sounds and assumed the gear was down. It's an easy mistake to make, and I personally believe I made the same mistake myself! > > An air leak can cause enough pressure loss to keep the gear from coming down and locking... but if that were the case, there would be no air left in the main and emergency bottle, because you would have blown the gear with the emergency valve. > > But if the gear was down and locked and indicating same ... you only have two possibilities. > > 1. The landing gear indicators were totally mis-rigged *AND* you had an air leak preventing total gear extension, in which case you should shoot your A&P mechanic for not inspecting the landing gear switches properly. > > 2. The landing gear was never down and locked to begin with. > > Once the gear is down and locked, it does not need air to keep it down and locked. Just the way it works Doc, so you may need to rethink what happened. > > Mark > > > > > > -----Original Message----- > From: owner-yak-list-server@matronics.com > [mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp > Sent: Thursday, June 06, 2013 16:15 > To: yak-list@matronics.com > Subject: Re: Yak-List: Air system 'stuff' > > > Speaking for the 78 model 50, the internal components are not the same YAK vs the CJ. It is easy to swap the entire check valve assembly out though. That is what I did on the 50. Solved the leaking check valve at the pop off problem in about 4 hours. Just wish I had caught the airline leak at the manifold for the acutators before the gear collapsed. Would have saved a lot of headaches! > Doc > > -----Original Message----- >> From: "A. Dennis Savarese" <dsavarese0812@bellsouth.net> >> Sent: Jun 6, 2013 1:44 PM >> To: yak-list@matronics.com >> Subject: Re: Yak-List: Air system 'stuff' >> >> --> <dsavarese0812@bellsouth.net> >> >> The Yak 50 pop off valve internal components may be interchangeable >> with the Chinese components. But definitely not the Yak 52. >> Dennis >> >> A. Dennis Savarese >> 334-285-6263 >> 334-546-8182 (mobile) >> www.yak-52.com >> Skype - Yakguy1 >> >> On 6/6/2013 1:18 PM, A. Dennis Savarese wrote: >>> <dsavarese0812@bellsouth.net> >>> >>> Unfortunately, the CJ6's pressure relief valve or pop off valve's >>> internal components are not the same as the one on the 52. The >>> pistons are not interchangeable. >>> >>> If you need a new piston for a Yak 52 pop off valve, I believe Jill >>> has them and so does Cliff Coy at Border Air. The spring for the >>> 52's pop off valve may be a little harder to find. But Jill or >>> Cliff can help with that. >>> >>> We have converted a few Yak 52's to the CJ6 pop off valve assembly >>> with the two Chinese check valves because the Chinese check valves >>> are significantly less expensive and Doug typically has them or overhaul >>> kits in stock. (Thank you Doug). The Russian check valves are VERY >>> expensive, IF you can find them. >>> >>> Dennis >>> >>> A. Dennis Savarese >>> 334-285-6263 >>> 334-546-8182 (mobile) >>> www.yak-52.com >>> Skype - Yakguy1 >>> >>> On 6/6/2013 11:34 AM, Bitterlich, Mark G CIV NAVAIR, WD wrote: >>>> <mark.bitterlich@navy.mil> >>>> >>>> Just FYI. >>>> >>>> The CJ6 valve ASSEMBLY that Doug has, is not always a direct >>>> replacement for every YAK pressure relief valve. Slightly >>>> different fittings in some cases. >>>> >>>> But the answer is obvious. If you take apart HIS valve and remove >>>> the sealing piston, spring and screw on pressure adjusting top >>>> piece, and put them on yours, they fit perfectly and will work perfectly. >>>> >>>> You will then have to reset your maximum pressure. Be careful. >>>> >>>> Mark Bitterlich >>>> >>>> >>>> -----Original Message----- >>>> From: owner-yak-list-server@matronics.com >>>> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Cory >>>> Robin >>>> Sent: Thursday, June 06, 2013 1:00 >>>> To: yak-list@matronics.com >>>> Subject: Re: Yak-List: Air system 'stuff' >>>> >>>> Thank you all. I contacted Doug and have a valve on it's way. > > > > > > > > > >


    Message 11


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    Time: 12:13:02 PM PST US
    From: "Walter Lannon" <wlannon@shaw.ca>
    Subject: Re: CJ Prop Nut
    Keith; Standard thread. Torque 50 to 60 Kg/M ( 370 to 430 Lb/Ft) Walt -----Original Message----- From: keithmckinley Sent: Saturday, June 08, 2013 7:06 AM Subject: Yak-List: CJ Prop Nut Is the nut holding the prop hub on the spline shaft a standard or left handed thread? Keith -------- Keith McKinley 700HS X26 Sebastian, FL Read this topic online here: http://forums.matronics.com/viewtopic.php?p=402279#402279


    Message 12


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    Time: 12:46:37 PM PST US
    From: Elmar & Manuela Hegenauer <samira.h@shaw.ca>
    Subject: RE: Hydraulic Lock
    Richard, thank you for posting these very informative pictures. I guess that engine comes from a Kamov-26? If yes, how do they turn the motor to prevent hydraulic lock? cheers Elmar


    Message 13


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    Time: 03:02:01 PM PST US
    Subject: Re: External Camera mounts
    From: Bill Geipel <l129bs@gmail.com>
    Send pix. Bill On Jun 8, 2013, at 9:01 AM, "keithmckinley" <cetopfed@gmail.com> wrote: > > I have a contour HD camera and I took a standard small camera swivel mount similar to the one shown. On the female end I epoxied a 4 mm screw. > I can attach it anywhere there is a 4mm screw on the plane.I just use a rubber washer to protect the paint. > > -------- > Keith McKinley > 700HS > X26 Sebastian, FL > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=402278#402278 > > > > > Attachments: > > http://forums.matronics.com//files/242727307_540.jpeg > > > > > > >


    Message 14


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    Time: 03:31:23 PM PST US
    Subject: Re: CJ Prop Nut
    From: "keithmckinley" <cetopfed@gmail.com>
    Thanks very much for responding Walt! Keith -------- Keith McKinley 700HS X26 Sebastian, FL Read this topic online here: http://forums.matronics.com/viewtopic.php?p=402294#402294


    Message 15


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    Time: 07:45:05 PM PST US
    From: Herb Coussons <drc@wscare.com>
    Subject: Re: External Camera mounts
    I like the creative things people are using. Here is what I came up with. A ram mount. One end is an angled piece to use a hose clamp on a tubular structure of the plane. THe other end of the ram mount is threaded for a camera then safety wired and a zip tie back up. I use the HD 170 camera. Attached is a sight picture example. Only bad thing is if the smoke is on, the lens gets oily. On Jun 8, 2013, at 11:12 AM, Bill Geipel <l129bs@gmail.com> wrote: > > Send pix. > > Bill > > On Jun 8, 2013, at 9:01 AM, "keithmckinley" <cetopfed@gmail.com> wrote: > >> >> I have a contour HD camera and I took a standard small camera swivel mount similar to the one shown. On the female end I epoxied a 4 mm screw. >> I can attach it anywhere there is a 4mm screw on the plane.I just use a rubber washer to protect the paint. >> >> -------- >> Keith McKinley >> 700HS >> X26 Sebastian, FL >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=402278#402278 >> >> >> >> >> Attachments: >> >> http://forums.matronics.com//files/242727307_540.jpeg >> >> >> >> >> >> >> > > > > >




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