---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sun 09/16/07: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:43 AM - Re: UOTE Re: MF'ing air system! Yak-50 (Brian Lloyd) 2. 02:22 PM - Re: UOTE Re: MF'ing air system! Yak-50 (Yak Pilot) 3. 02:25 PM - Re: Yak-50 fly-by.... (Yak Pilot) 4. 02:36 PM - New to radials and hydro lock concerns (Craig Winkelmann) 5. 04:31 PM - Re: New to radials and hydro lock concerns (Scooter) 6. 07:29 PM - Re: MF'ing air system! Yak-50 (Tim Gagnon) 7. 07:55 PM - Re: Re: MF'ing air system! Yak-50 (Lynn Allen) ________________________________ Message 1 _____________________________________ Time: 07:43:02 AM PST US From: Brian Lloyd Subject: Re: Yak-List: UOTE Re: MF'ing air system! Yak-50 On Sep 15, 2007, at 7:14 PM, Craig Winkelmann, CFI wrote: > > > Doc: > > Gotta give it to ya...pullin' out those old textbooks. I've packed > mine away. However, from my engineering days, you are right on > with Mr. Bernoulli. Air is a "fluid" that is in motion, hence his > law applies. Of course it applies and equally, of course, it doesn't matter. We are dealing with a sudden transition, air, and such a large pressure differential that we don't need to analyze it that much. We know empirically that, a) given a hole of size 'x' and, b) a pressure differential of 'y', that the flow will be 'z'. (BTW, this is how your compression tester works.) The key here being that 'z' is a lot smaller than what we want and the solution is to just make 'x' bigger. So Tim, getting back to the MF'ing Yak-50 pneumatic system (which, by the way, IS where we started), go look to see what is blocking the flow of air to/from your storage tank (if anything). If something is, fix it. If not, tell us and we will put our collective brains (the sum of which might equal 1) and try to come up with another answer. (Ya know, part of intelligence is knowing when you don't need to launch a weather satellite -- that licking your finger and sticking it up into the wind is sufficient to solve the problem. And, yes, as a matter of fact I DO violate this principle all too often. :-) -- 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 2 _____________________________________ Time: 02:22:18 PM PST US From: Yak Pilot Subject: Re: Yak-List: UOTE Re: MF'ing air system! Yak-50 Mr. Bernoulli stated that the faster that a fluid moves on or through a surface the less pressure it exerts on that surface. Any time a fluid moves on or through a surface, (such as air through a tube) then of course Mr. Bernoulli's law applies. The question is, what does it apply TO? Further, does what it applies to have anything to do with Tim's problem? In most cases Mr. B's law applies to wing surfaces, venturi tubes, etc. It addresses the speed and pressure and volume of air masses flowing ON OR THROUGH something. Now.. take a small pipe of say 1/4" diameter, and feed it with a regulated supply of say 3000 PSI of air with standard day density. Have it connected to a piston actuator with a 2 inch diameter. Have the piston lifting a 100 pound load. Disregard friction losses in the piston. How fast will the piston move? Now have an 1/8" air line of 10 feet connect to the above example with the 1/4" line. Will the piston move: A. Faster B. Slower C. Stay the same speed. If faster or slower, by how much? Show proof please. Anwser this question using strictly Bernoulli's Law. Go for it Doc. Mark "Craig Winkelmann, CFI" wrote: Doc: Gotta give it to ya...pullin' out those old textbooks. I've packed mine away. However, from my engineering days, you are right on with Mr. Bernoulli. Air is a "fluid" that is in motion, hence his law applies. By the way, some folks don't think Bernoulli's Law applies to aircraft wings as the reason for them generating lift. Check out http://www.allstar.fiu.edu/aero/airflylvl3.htm for a different view of lift!! Craig Read this topic online here: http://forums.matronics.com/viewtopic.php?p=134602#134602 ________________________________ Message 3 _____________________________________ Time: 02:25:00 PM PST US From: Yak Pilot Subject: Re: Yak-List: Yak-50 fly-by.... I think I know who it is too, but walls have ears. Mark Tim Gagnon wrote: This airplane looks very familiar......I think I know whose it is. http://www.youtube.com/watch?v=Q7bl9AeS00Q Read this topic online here: http://forums.matronics.com/viewtopic.php?p=134310#134310 ________________________________ Message 4 _____________________________________ Time: 02:36:54 PM PST US From: "Craig Winkelmann" Subject: Yak-List: New to radials and hydro lock concerns Folks: I am new to radial engines. The quick drains on these engines is usually placed on the intake tubes on the lower cylinders. However, some times when pulling the prop through, oil comes out the exhaust stack. Is this an issue? What is the difference if the oil comes out the intake or exhaust? Or is there any? Thanks, Craig ________________________________ Message 5 _____________________________________ Time: 04:31:17 PM PST US Subject: Yak-List: Re: New to radials and hydro lock concerns From: "Scooter" Take a look at "An Introduction to the M14P for Flat-Engine Pilots" by Fred Abramson. It should answer many questions: http://staff.jccc.net/droberts/yak52/m14p_fa.html [quote="Craig Winkelmann, CFI"]Folks: I am new to radial engines. The quick drains on these engines is usually placed on the intake tubes on the lower cylinders. However, some times when pulling the prop through, oil comes out the exhaust stack. Is this an issue? What is the difference if the oil comes out the intake or exhaust? Or is there any? Thanks, Craig > [b] Read this topic online here: http://forums.matronics.com/viewtopic.php?p=134732#134732 ________________________________ Message 6 _____________________________________ Time: 07:29:17 PM PST US Subject: Yak-List: Re: MF'ing air system! Yak-50 From: "Tim Gagnon" I just got back from an airshow in Terre Haute...I will check in on the airplane this week. I saw a four ship 3 Yak-s and a CJ....I could not find their owners. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=134772#134772 ________________________________ Message 7 _____________________________________ Time: 07:55:40 PM PST US From: Lynn Allen Subject: Re: Yak-List: Re: MF'ing air system! Yak-50 Tim, has there been any word if you all are going to fly in for the Mustang Show in Columbus later this month? TIA, Lynn I just got back from an airshow in Terre Haute...I will check in on the airplane this week. I saw a four ship 3 Yak-s and a CJ....I could not find their owners. 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