---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sat 05/23/09: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:34 AM - Re: Still looking for a snot valve - help (Scott Poehlmann) 2. 04:41 AM - Spark Plug gap (Cpayne) 3. 02:54 PM - need yak 52 fuel sending unit (Stephen Morrey) 4. 05:31 PM - Yak 52 PTT (aero49) ________________________________ Message 1 _____________________________________ Time: 04:34:14 AM PST US From: Scott Poehlmann Subject: Re: Yak-List: Still looking for a snot valve - help Hi Herb, Yup, Assistant Professor of Obstetrics and Gynecology, Texas Tech University Paul L. Foster School of Medicine (what a mouthful). Says so right here on my name tag, so it must be true... I'm really more of a Urogyn than a regular gyn--but I guess that makes my interest in the plumbing of these planes make even more sense... I can imagine the mess--I've seen what comes out of the snot valves in 52s. So how long did you have to Cidex the 'scope after you used it?...! Scott Herb Coussons wrote: > > Are you kidding - a gynecologist? > Me too! And I actually have used a flexible hysteroscope on an airplane. > > > I have the same experience with the 55, I get hardly any return when I > use the valve connected to the bottom of the tank. Whereas the CJ > description that Doug gave, turning the knob behind the cowl on the > Wilga dumped the biggest mess you can imagine. > > Herb Coussons > > > On May 22, 2009, at 7:35 PM, Scott Poehlmann wrote: > >> >> Hi Dennis, >> >> I agree with your concern, but the system in a most 55's is different >> than that in the 52 (or even the 50). First off, I (and most others) >> have an overboard dump line--99% of the time the compressor is >> pumping air overboard and NOT through the system, thus most of the >> time the system is sealed. I dutifully check for "snot" but >> essentially NEVER get anything out. Second, the system ONLY operates >> the starter--thus the lines are short and relatively straight--in >> fact my entire air system is on the engine side of the firewall >> except for the line to the cockpit pressure guage. Third, I at least >> have my tank visually inspected every other annual or so, so I know >> it isn't corroded (as a gynecologist, I find it fascinating that the >> exact same instrument I call a "diagnostic hysteroscope" and which >> costs over $15,000 can be had by an A&P for < $500 when it is called >> a "flexible boroscope"... but that's another discussion...). Given >> these things, I don't think that using the tank bottom drain valve as >> the snot valve is unreasonable--adding such a valve would just give >> me another point from which the system could leak. But the concern >> about corrosion is very real--just one look at the 52 from England >> that had the bottle explode is enough to convince me! >> >> Best, >> >> Scott >> >> doug sapp wrote: >>> As always your mileage may vary but the thought of a rusted or >>> corroded air bottle exploding in a aircraft really chills my crap!, >>> in my mind it is simply is not worth the chance. Add to this the >>> fact that your pushing all the moisture and gunk into your expensive >>> start valve and check valves which is just not a good deal even if >>> you have replaced all the springs with stainless steel. IMHO the >>> added cost of a snot valve AND a dessicant filter will save you a >>> bunch of money and trouble down the road. >>> Always Yakin, >>> Doug >>> >>> On Fri, May 22, 2009 at 4:23 AM, Scott Poehlmann >> > wrote: >>> >>> > >>> >>> Hi Anthony, >>> >>> Since the volume of the bottle (and the whole system, in fact) on >>> the 55 is so low, many do not have separate snot valves. Mine for >>> example only has the valve on the bottom of the tank. I dutifully >>> open it slightly and drain out the gunk about once a week or so >>> (and you don't need to completely drain the system, though until >>> you get used to doing it quickly, be prepared to refill the air >>> system), and at each annual I use that valve to drain the entire >>> system. It is also the lowest point in the system, so that's where >>> the gunk ends up. >>> >>> Scott >>> >>> >>> Yak 55M wrote: >>> >>> Hi, >>> >>> I have finally secured almost everything I need to add a >>> compressor to my Yak55M, but I am missing one more item - a >>> snot valve. It seems this little item is difficult to get. >>> Any lines on where I can get a snot valve would be greatly >>> appreciated. >>> >>> Thanks in advance, >>> >>> Anthony. >>> >>> BTW, thanks for all of the advice in finding the sheer >>> coupling and gauge, this list made it happen. >>> * >>> >>> >>> * >>> >>> >>> ========== >>> rget="_blank">http://www.matronics.com/Navigator?Yak-List >>> ========== >>> http://forums.matronics.com >>> ========== >>> le, List Admin. >>> ="_blank">http://www.matronics.com/contribution >>> ========== >>> >>> >>> >>> >>> >>> >>> -- >>> Always Yakin, >>> Doug Sapp >>> Phone 509-826-4610 >>> Fax 509-826-3644 >>> * >>> >>> >>> * >> >> >> >> > > ________________________________ Message 2 _____________________________________ Time: 04:41:20 AM PST US From: Cpayne Subject: Yak-List: Spark Plug gap Confession is sometimes good for the soul...as Mark steps up and says: >ANYWAY ~ Funny thing. The high speed vibration went away too. Mag checks >during all of this were always good. No indication of plug problems at all. >Upon inspection, found that the plug gap was set too wide ... My fault for >not double checking the A&P that was helping me put in the kit way back >when. The plugs were at .032 or so. Dennis recommends .025 I have talked >to other folks who claim .018 is about right, and that wider than .018 can >cause "starting problems". I have mine now gapped at .025 per Dennis's >recommendation and everything is working perfectly, so I will avoid .018, >but it is worth keeping in the back of your head. No news to those of us believers in the auto plug setup. However, more work could be done in this area. These magnetos have a lot of "energy" but not the kind of voltage that could be an added benefit when using automotive plugs. Then the plug gap could be increased a bit. One way to do this is add-on devices that step up the voltage and reshape the "spike", but still revert to standard operation if they fail. What i am describing is a kind of ignition system that existed during the early days of electronic ignitions, but improves on it by providing multiple pulses, tuned to the engine condition. As of yet, I don't have the motivation to develop a design but I like the idea of retaining the original mag and enhancing it's operation. Any takers? Craig Payne ________________________________ Message 3 _____________________________________ Time: 02:54:52 PM PST US Subject: Yak-List: need yak 52 fuel sending unit From: Stephen Morrey Does anyone have a functioning yak 52 fuel sending unit steve ________________________________ Message 4 _____________________________________ Time: 05:31:01 PM PST US Subject: Yak-List: Yak 52 PTT From: "aero49" I'm planning to install an SL30 and keep the Russian radio in place as #2. Want to use P.S. engineering PMA 4000 as a primary PTT type intercom and to switch between radios. The PMA 4000 only provides a single lead to each com thru which a ground is applied to transmit. Anyone know if the Russian PTT swith closes a circuit to the Russian Com or if it just applies a ground the com? any info on this application would be appreciated. Cecil Boyd Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245091#245091 ------------------------------------------------------------------------------------- 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.