---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sat 09/22/07: 11 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:56 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Ernie) 2. 11:43 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Tim Gagnon) 3. 11:43 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Tim Gagnon) 4. 11:54 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Tim Gagnon) 5. 11:57 AM - Can someone GIVE me 850K (Tim Gagnon) 6. 12:15 PM - Re: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Yak Pilot) 7. 12:40 PM - Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Tim Gagnon) 8. 12:46 PM - Back to Tim's problem (was: Bernoilli, His Equation, Air Moving in Pipes and Flight) (Brian Lloyd) 9. 02:37 PM - Re: Back to Tim's problem (was: Bernoilli, His Equation, Air Mov (Scooter) 10. 04:55 PM - Re: Back to Tim's problem (was: Bernoilli, His Equation, Air Moving in Pipes and Flight) (Terry Lewis) 11. 05:06 PM - Re: Back to Tim's problem (was: Bernoilli, His Equation, Air Moving in Pipes and Flight) (Brian Lloyd) ________________________________ Message 1 _____________________________________ Time: 06:56:30 AM PST US Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight From: "Ernie" Magnus has no effect on the burrple destrofunkenspicthen, when bernouli tickles his testicular nipplefricker. Now on the other hand, if you diassemble the pooter evector during a combined molecular fusion butterjamtoastgotshitonmyshirt event, then you may ripp the goddam wings off of the plane. Ernie Read this topic online here: http://forums.matronics.com/viewtopic.php?p=135747#135747 ________________________________ Message 2 _____________________________________ Time: 11:43:30 AM PST US Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight From: "Tim Gagnon" Ernie wrote: > Magnus has no effect on the burrple destrofunkenspicthen, when bernouli tickles his testicular nipplefricker. Now on the other hand, if you diassemble the pooter evector during a combined molecular fusion butterjamtoastgotshitonmyshirt event, then you may ripp the goddam wings off of the plane. > > Ernie Exactly..... (The new spell checker went nuts on this) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=135779#135779 ________________________________ Message 3 _____________________________________ Time: 11:43:34 AM PST US Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight From: "Tim Gagnon" Ernie wrote: > Magnus has no effect on the burrple destrofunkenspicthen, when bernouli tickles his testicular nipplefricker. Now on the other hand, if you diassemble the pooter evector during a combined molecular fusion butterjamtoastgotshitonmyshirt event, then you may ripp the goddam wings off of the plane. > > Ernie Exactly..... (The new spell checker went nuts on this) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=135778#135778 ________________________________ Message 4 _____________________________________ Time: 11:54:16 AM PST US Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight From: "Tim Gagnon" I spoke to the mechanic who did the work on my airplane. Before anyone jumps on him for "shoulda known better", the guy does amazing work and the use of the a smaller diameter line was talked about. His lack of experience with Yaks and my...hmmm...lack of thorough knowledge lead us towards using the fill line from the fill port instead of running a new line from the new bottle (behind my seat). So, we will replace the line with one of original diameter. We will also check for leaks.... Sooo......a few observations from todays flight and something that may add a wrench to the works...OR....turn a light bulb on for someone. Go to the airplane to fly this morning. Gauge reads about 40. Turn on the main valve, pressure drops to about 20. Hmmmm...small leak somewhere downstream of the bottle? (The airplane has been sitting for about a week or so) She starts perfectly after a few blades, I let her warm up to 120c+ and when I push the lever forward, I have about 40 ATM. This is after about 6 or 7 minutes from start to throttle up for take off. Making good pressure. Lift off, gear handle up, that big pressure drop (20+ atm) but gears comes home nicely with a reassuring thump. Pressure rebuilds to >55 ATM after somewhere between 5-10 minutes of flying. Go flip around a bit, come back into the pattern, gear down off the perch, big pressure drop (same pressure drop) and gear thumps nicely. Land with about 25 atm in the airplane. Run up, pressure builds back up to 40 or so, but did something new this time....hopefully not unsafe. Brakes on, run up to 70% for about a minute, pressure builds to about 40, then I SHUT OFF (engine still running) the main valve and the pressure builds to about 55 ATM and I shut her down. I have some thoughts but want to verify mine with yours....you guys are way smarter than I am. I am glad this thread has generated some healthy, yet calm, discussion. I have learned much... One more question. What are you guys normal oil temps in cruise at a crusie power setting. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=135781#135781 ________________________________ Message 5 _____________________________________ Time: 11:57:59 AM PST US Subject: Yak-List: Can someone GIVE me 850K From: "Tim Gagnon" I want this airplane! http://www.courtesyaircraft.com/Lavochkin%20LA-9%20Spec.htm Read this topic online here: http://forums.matronics.com/viewtopic.php?p=135782#135782 ________________________________ Message 6 _____________________________________ Time: 12:15:10 PM PST US From: Yak Pilot Subject: Re: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight I am starting to wonder whether you might just have a bad gage. Checked for that yet? Mark Tim Gagnon wrote: I spoke to the mechanic who did the work on my airplane. Before anyone jumps on him for "shoulda known better", the guy does amazing work and the use of the a smaller diameter line was talked about. His lack of experience with Yaks and my...hmmm...lack of thorough knowledge lead us towards using the fill line from the fill port instead of running a new line from the new bottle (behind my seat). So, we will replace the line with one of original diameter. We will also check for leaks.... Sooo......a few observations from todays flight and something that may add a wrench to the works...OR....turn a light bulb on for someone. Go to the airplane to fly this morning. Gauge reads about 40. Turn on the main valve, pressure drops to about 20. Hmmmm...small leak somewhere downstream of the bottle? (The airplane has been sitting for about a week or so) She starts perfectly after a few blades, I let her warm up to 120c+ and when I push the lever forward, I have about 40 ATM. This is after about 6 or 7 minutes from start to throttle up for take off. Making good pressure. Lift off, gear handle up, that big pressure drop (20+ atm) but gears comes home nicely with a reassuring thump. Pressure rebuilds to >55 ATM after somewhere between 5-10 minutes of flying. Go flip around a bit, come back into the pattern, gear down off the perch, big pressure drop (same pressure drop) and gear thumps nicely. Land with about 25 atm in the airplane. Run up, pressure builds back up to 40 or so, but did something new this time....hopefully not unsafe. Brakes on, run up to 70% for about a minute, pressure builds to about 40, then I SHUT OFF (engine still running) the main valve and the pressure builds to about 55 ATM and I shut her down. I have some thoughts but want to verify mine with yours....you guys are way smarter than I am. I am glad this thread has generated some healthy, yet calm, discussion. I have learned much... One more question. What are you guys normal oil temps in cruise at a crusie power setting. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=135781#135781 ________________________________ Message 7 _____________________________________ Time: 12:40:25 PM PST US Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight From: "Tim Gagnon" Nope...but I will add that to the list of things to check! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=135791#135791 ________________________________ Message 8 _____________________________________ Time: 12:46:14 PM PST US From: Brian Lloyd Subject: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation, Air Moving in Pipes and Flight) On Sep 22, 2007, at 11:53 AM, Tim Gagnon wrote: > pattern, gear down off the perch, big pressure drop (same pressure > drop) and gear thumps nicely. Land with about 25 atm in the > airplane. Run up, pressure builds back up to 40 or so, but did > something new this time....hopefully not unsafe. > > Brakes on, run up to 70% for about a minute, pressure builds to > about 40, then I SHUT OFF (engine still running) the main valve and > the pressure builds to about 55 ATM and I shut her down. One comment. Everything is working but you are getting a big pressure change with gear actuation and a rapid pressure recovery. If you had a leak, the pressure would keep going down but your pressure comes right back up again. That says to me, no leak. The big changes in pressure also tell me, small volume. Check your tank. Something is taking up a lot of space in there and leaving you with very little system volume. -- Brian Lloyd 3191 Western Drive brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682 +1.916.367.2131 (voice) +1.270.912.0788 (fax) I fly because it releases my mind from the tyranny of petty things . . . Antoine de Saint-Exupry PGP key ID: 12095C52A32A1B6C PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C ________________________________ Message 9 _____________________________________ Time: 02:37:48 PM PST US Subject: Yak-List: Re: Back to Tim's problem (was: Bernoilli, His Equation, Air Mov From: "Scooter" I can't recall how the Yak-50 air system is set up... If this were a 52 I'd almost think (going under Brian's theory) that the main and reserve bottles were swapped. This would account for a big pressure drop when turning on the main valve and quick recharge. But it's probably unlikely the reserve tubing was mucked with. Other guess would be a variable leak downstream from the main valve. If this were the case then it would appear to seal up a bit as pressure was applied - but not completely - and is not allowing anything over 40atm. If it were a bottle swap as in the first case then you'd still get the 55atm. I'd bet on the leak. You should get this Bernouilli guy to check it out. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=135804#135804 ________________________________ Message 10 ____________________________________ Time: 04:55:14 PM PST US From: "Terry Lewis" Subject: Re: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation, Air Moving in Pipes and Flight) Water? Terry ----- Original Message ----- From: "Brian Lloyd" Sent: Saturday, September 22, 2007 3:45 PM Subject: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation, Air Moving in Pipes and Flight) > > On Sep 22, 2007, at 11:53 AM, Tim Gagnon wrote: > >> pattern, gear down off the perch, big pressure drop (same pressure drop) >> and gear thumps nicely. Land with about 25 atm in the airplane. Run up, >> pressure builds back up to 40 or so, but did something new this >> time....hopefully not unsafe. >> >> Brakes on, run up to 70% for about a minute, pressure builds to about >> 40, then I SHUT OFF (engine still running) the main valve and the >> pressure builds to about 55 ATM and I shut her down. > > One comment. Everything is working but you are getting a big pressure > change with gear actuation and a rapid pressure recovery. If you had a > leak, the pressure would keep going down but your pressure comes right > back up again. That says to me, no leak. The big changes in pressure also > tell me, small volume. Check your tank. Something is taking up a lot of > space in there and leaving you with very little system volume. > > > -- > Brian Lloyd 3191 Western Drive > brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682 > +1.916.367.2131 (voice) +1.270.912.0788 (fax) > > I fly because it releases my mind from the tyranny of petty things . . . > Antoine de Saint-Exupry > > PGP key ID: 12095C52A32A1B6C > PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C > > > ________________________________ Message 11 ____________________________________ Time: 05:06:11 PM PST US From: Brian Lloyd Subject: Re: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation, Air Moving in Pipes and Flight) On Sep 22, 2007, at 4:54 PM, Terry Lewis wrote: > > Water? Ah! I was trying to think of something that might be in the tank taking up space but couldn't think of anything off hand. Water would do it. But as I said before, Tim needs to look everything over really well. Something's rotten in Denmark. We are just guessing right now and while I think my troubleshooting is well reasoned, it doesn't take the place of actually going to look. > Terry -- Brian Lloyd 3191 Western Drive brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682 +1.916.367.2131 (voice) +1.270.912.0788 (fax) I fly because it releases my mind from the tyranny of petty things . . . Antoine de Saint-Exupry PGP key ID: 12095C52A32A1B6C PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C ------------------------------------------------------------------------------------- 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.