---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Fri 12/20/19: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:34 AM - Re: Yak-50 shuttle valve assemblies - WTB (Roger Kemp) 2. 05:39 PM - Re: cold starting savvy, Housai... advice? (JL2A) ________________________________ Message 1 _____________________________________ Time: 05:34:04 AM PST US From: Roger Kemp Subject: Re: Yak-List: Yak-50 shuttle valve assemblies - WTB Doug, Nothing to apologize for. Glad to see YOU are able to be up and at =98 em again. Rest when you need and don=99t over do it. The I need it Now May need to wait until tomorrow. Your recovery is more important. God Speed, Doc Sent from my iPad > On Dec 18, 2019, at 3:53 PM, doug sapp wrote: > > =EF=BB > Marco, > Send me a photo of your shuttle valve. > It looks like they are cutting me loose from the cancer clinic for a few d ays so we will be back in Omak Sat, Sun, and Monday filling and shipping tho se orders received via email in the past two weeks. > My apologies to all those who we have kept waiting. > > Doug > > >> On Wed, Dec 18, 2019 at 12:48 PM Marco Caflisch wrote: >> Anyone have suggestions for a source for shuttle valve assemblies (housin g plus ball) for a Yak-50 landing gear system? I'm told that unfortunately o ne can't use those from a Yak-52. >> >> I've so far drawn blanks with M-14P Inc, Doug Sapp and George Coy here in the US; I also have an email out to Plamen Petkov in Bulgaria. Any other su ggestions are much appreciated! >> >> Many thanks, >> Marco >> >> San Francisco, CA ________________________________ Message 2 _____________________________________ Time: 05:39:04 PM PST US Subject: Yak-List: Re: cold starting savvy, Housai... advice? From: "JL2A" lots of prime on a stationary engine leads to a lot of liquid fuel in the lower cylinders. Have heard of a few destroyed HS6 'static' priming. I can't see how pulling blades through by hand has much effect on fuel distribution. In cold weather I'd say most of the fuel getting sprayed into the supercharger case from the primer is remaining liquid and pooling in the lower cylinders. This way you have 3 cylinders way too rich to start, spark plugs literally drowned in fuel, and the remaining 6 way too lean. While we don't experience the cold temps of the OP, try just 1 prime, hit start while simultaneously priming until it fires. Logic here is that the supercharger impeller is spinning at maybe a couple hundred RPM while fuel is sprayed onto it, flinging it around to give a more uniform mixture delivered to *most* of the cylinders. Drastically reduces the risk of hydraulic lock due over priming, and you don't have to keep getting in and out of the cockpit! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=493912#493912 ------------------------------------------------------------------------------------- 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.