---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Thu 08/20/15: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:10 AM - Re: Engine work stand (Marcus Bates) 2. 10:33 AM - Re: Engine work stand (Robin Hou) 3. 06:14 PM - Nanchang Air System (Byron Fox) 4. 06:51 PM - Re: Nanchang Air System (Ernest Martinez) 5. 07:31 PM - Re: Nanchang Air System (av8ter) 6. 07:35 PM - "Airshow"over the Lake today - Yak.... (av8ter) 7. 07:55 PM - Re: Nanchang Air System (Roger Kemp) ________________________________ Message 1 _____________________________________ Time: 07:10:08 AM PST US Subject: Re: Yak-List: Engine work stand From: Marcus Bates The prop on the Housai engine has a splined flange that can be unbolted from the main hub. Find an old, unairworthy prop, remove flange and bolt the flange to the stand. Kinda like an old A-65 Continental prop flange. Sent from my iPad > On Aug 19, 2015, at 9:37 PM, Roger Kemp wrote: > > This is what we used to teardown my YAK 50 engine. Mounted the stand to the prop flange. > Doc > > > > > > Sent from my iPad > 

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________________________________ Message 2 _____________________________________ Time: 10:33:15 AM PST US From: Robin Hou Subject: Re: Yak-List: Engine work stand Thank you Doc, Marcus and Elmar. I think I know where to go from here. Agai n, thanks for sharing your experience. On Thursday, August 20, 2015 7:27 AM, Marcus Bates wrote: The prop on the Housai engine has a splined flange that can be unbolted fro m the main hub.=C2- Find an old, unairworthy prop, remove flange and bolt the flange to the stand.=C2- Kinda like an old A-65 Continental prop fla nge. Sent from my iPad > On Aug 19, 2015, at 9:37 PM, Roger Kemp wrote: > > This is what we used to teardown my YAK 50 engine. Mounted the stand to t he prop flange. > Doc > > > > > > Sent from my iPad > 

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S - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ________________________________ Message 3 _____________________________________ Time: 06:14:07 PM PST US Subject: Yak-List: Nanchang Air System From: Byron Fox 14 years ago, I'd turn the main air off and come back a week later to discover there was still 30+ atmospheres (or CMUs - Chinese Mystery Units - or whatever) still in the plumbing south of the main shutoff valve. To maintain this happy state of affairs over time, I've overhauled the gear actuators, replaced front and back seat gear and flap valves, and routinely service check and shuttle valves. That brings us to today. Shut off the main air. Go to lunch. Come back in 45 minutes. Air in the plumbing - zero. WTF! So: 1. Balloon tested gear actuators. No seeping. 2. All firewall check valves overhauled within past month. 3. Pop off valve overhauled. 4. New snot valve. 5. Put a/c on jacks, put front gear and flap handles in neutral position bleeding off down pressure on gear actuators and up pressure on flap. Plumbing still bleeding off rapidly. Granted, this is no big deal. The compressor brings the stored air up quickly. It's me just being anal. But before I go through all the check valves again, does anybody have a bright idea? Thanks, Blitz Fox 415-307-2405 ________________________________ Message 4 _____________________________________ Time: 06:51:02 PM PST US Subject: Re: Yak-List: Nanchang Air System From: Ernest Martinez It's all due to global warming. 14 years ago there was a lot less CO2 in the air. Air is mostly nitrogen, and nitrogen is the largest molecule in air, so it has a hard time leaking past seals. But now that we have so much more smaller CO2 molecules in the air, it's now much more slippery than it was 14 years ago, so it leaks past your seals that much more readily. I installed aCO2 scrubber from a submarine just upstream of my air compressor, in order to fatten up my air. I also rebuilt my check valves, I found, that they were leaking slightly past the lead washer. Ernie On Thursday, August 20, 2015, Byron Fox wrote: > > > > 14 years ago, I'd turn the main air off and come back a week later to > discover there was still 30+ atmospheres (or CMUs - Chinese Mystery > Units - or whatever) still in the plumbing south of the main shutoff > valve. > > To maintain this happy state of affairs over time, I've overhauled the > gear actuators, replaced front and back seat gear and flap valves, and > routinely service check and shuttle valves. > > That brings us to today. Shut off the main air. Go to lunch. Come back > in 45 minutes. Air in the plumbing - zero. WTF! > > So: > > 1. Balloon tested gear actuators. No seeping. > > W2. All firewall check valves > overhauled within past month. > > 3. Pop off valve overhauled. > There > 4. New snot valve. > > 5. Put a/c on jacks, put front gear and flap handles in neutral > position bleeding off down pressure on gear actuators and up pressure > on flap. Plumbing still bleeding off rapidly. > > Granted, this is no big deal. The compressor brings the stored air up > quickly. It's me just being anal. > But before I go through all the check valves again, does anybody have > a bright idea? > > Thanks, > > > Blitz Fox > 415-307-2405 > > ________________________________ Message 5 _____________________________________ Time: 07:31:47 PM PST US Subject: Yak-List: Re: Nanchang Air System From: "av8ter" I can and do appreciate the pursuit of perfection in all things that aviate, but this seems like spending 3 hours to find a 2 cent error in your checking account. I would look at the main air shutoff valve (Stainless?) and possibly the pressure gauge. Good luck! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=446225#446225 ________________________________ Message 6 _____________________________________ Time: 07:35:54 PM PST US Subject: Yak-List: "Airshow"over the Lake today - Yak.... From: "av8ter" Enjoyed it! Nice tight hammerheads and liked the rolls on the vertical up-line! Smoke on next time. 3 turn spin was nicely done as well! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=446226#446226 ________________________________ Message 7 _____________________________________ Time: 07:55:12 PM PST US Subject: Re: Yak-List: Nanchang Air System From: Roger Kemp Developing a crack in the aluminum lines. Where is the manic question. Leaking around B nuts would be another. Don't forget your new check valves can go TU too. I'm still chasing a leak in my 52. But, I have only replaced half of my check valves. I'm getting to old for this! Bring back hydraulics! They freeking leak so you at least get a clue of the general place in the airframe it is coming from! There is enough dried soapy spray in my fuselage to wash the aircraft for a year. Doc Doc Sent from my iPad > On Aug 20, 2015, at 8:05 PM, Byron Fox wrote: > > > 14 years ago, I'd turn the main air off and come back a week later to > discover there was still 30+ atmospheres (or CMUs - Chinese Mystery > Units - or whatever) still in the plumbing south of the main shutoff > valve. > > To maintain this happy state of affairs over time, I've overhauled the > gear actuators, replaced front and back seat gear and flap valves, and > routinely service check and shuttle valves. > > That brings us to today. Shut off the main air. Go to lunch. Come back > in 45 minutes. Air in the plumbing - zero. WTF! > > So: > > 1. Balloon tested gear actuators. No seeping. > > 2. All firewall check valves > overhauled within past month. > > 3. Pop off valve overhauled. > > 4. New snot valve. > > 5. Put a/c on jacks, put front gear and flap handles in neutral > position bleeding off down pressure on gear actuators and up pressure > on flap. Plumbing still bleeding off rapidly. > > Granted, this is no big deal. The compressor brings the stored air up > quickly. It's me just being anal. > But before I go through all the check valves again, does anybody have > a bright idea? > > Thanks, > > > > Blitz Fox > 415-307-2405 > > > > ------------------------------------------------------------------------------------- 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.