---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Wed 11/30/05: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:17 AM - Last "Official" Day To Make Your List Contribution!! (Matt Dralle) 2. 12:59 PM - Re: Aluminum tape (Hans Teijgeler) ________________________________ Message 1 _____________________________________ Time: 12:17:28 AM PST US From: Matt Dralle Subject: Engines-List: Last "Official" Day To Make Your List Contribution!! --> Engines-List message posted by: Matt Dralle Dear Listers, Well, its November 30th and that means three things... 1) Today I am officially 42 years old (sympathy is appreciated)! 2) It marks that last "official" day of the List Fund Raiser! 3) Its the last day I will be bugging everyone for a whole year! :-) If you use the Lists and enjoy the content and the no-advertising, no-spam, and no-censorship way in which they're run, please make a Contribution today to support their continued operation and upkeep. Your $20 or $30 goes a long way to further the List operation and keep the bills paid. A Lister wrote a funny message in the comments field of his Contribution that I thought summed things up pretty well: "Worth every penny and I'm a tightwad!" Thank you to everyone that has made a Contribution so far this year! It is greatly appreciated. Contributions: http://www.matronics.com/contribution Best regards, Matt Dralle List Administrator Matt G Dralle | Matronics | PO Box 347 | Livermore | CA | 94551 925-606-1001 V | 925-606-6281 F | dralle@matronics.com Email http://www.matronics.com/ WWW | Featuring Products For Aircraft do not archive ________________________________ Message 2 _____________________________________ Time: 12:59:23 PM PST US From: "Hans Teijgeler" Subject: RE: Engines-List: Aluminum tape --> Engines-List message posted by: "Hans Teijgeler" Hi Gene, There are many people who are much more knowledgeable than I am! I am merely gathering information where I can get it, and have been doing so for my auto engine conversion for the past 9 years or so. Anyway, I have never really looked at straight stacks, to bo honest, as these are indeed an absolute no-go in my noise sensitive area. There are definate advantages and disadvantages to straight stacks: Pro: They are simple to fabricate, have little or no issues with expanding under heat, so no need for slip joints or ball joints. They are dead simple to all keep at the same length, avoiding uneven running of the engine due to a different state of tune (provided you work on the intake side as well that is). Con: They are noisy (and you have to sit in this noise yourself too!). You will not be able to tune the length for maximum performance (not that a lot of people do this anyway), and it is sometimes a bit hard to get a muff for carb heat and cabin heat around them. Bottom line: they provide a simple solution to the problem of getting the exhaust gasses away. It is not the most elegant one, nor is it the most efficient. But it works. As proven by countless aircraft that are flying around like that. Have fun! Hans > -----Original Message----- > From: owner-engines-list-server@matronics.com [mailto:owner-engines-list- > server@matronics.com] On Behalf Of Gene Smith > Sent: zondag 27 november 2005 16:56 > To: engines-list@matronics.com > Subject: Re: Engines-List: Aluminum tape > > --> Engines-List message posted by: "Gene Smith" > > Hans.............Apparently you are very knowledgeable about these exhaust > systems, and obviously other aspects of complicated engineering > subjects...(I read everything on your "home" page, and the links, and > noticed you supplied a lot of the formulas for the exhaust > problems)...What > is your opinion/experience/knowledge of "straight pipes," especially on a > air-cooled engine like the Lycoming 0320?..(a separate pipe for each > cylinder)...I know they present a little more noise, but here in Texas, it > isn't much of a problem yet...I also know Europe is strangled by those > stringent regulations..................Thanks for your inputs to this > list...................CHEERS!!!! > > > ----- Original Message ----- > From: "Hans Teijgeler" > To: > Subject: RE: Engines-List: Aluminum tape > > > > --> Engines-List message posted by: "Hans Teijgeler" > > > > A Jodel DR1050 (see www.jodel.com - it's the aircraft on the home page), > > with a Subaru engine. > > > > The principles are the same though. > > > > There are three forms of heat transfer: > > > > * By contact > > * By conduction > > * By radiation > > > > If you make sure the exhaust does not touch the part that you are trying > to > > protect, then this form of heat transfer does not occur > > > > There is so much air circulating through the cowling that during flight > heat > > transfer through conduction is not really an issue. It is just on the > ground > > that this mechanism starts to work (the infamous "heat soaking" effect). > > Just make sure that your hot air can leave the cowling when not in > flight. > > > > Which leaves radiation. The best you can do is provide a mirror-like > > surface, as heat waves will bounce off it just as well as light does > (after > > all, it is the same mechanism, just infrared light). > > > > In short: anything shiny will work. > > > > Hans > > > > P.S. To put point #2 into perspective, I have measured the temps inside > my > > cowling, at the top of the cowling. During flight, temps were a mere 4 > to > 6F > > over ambient. Upon shutting down the engine, temps started to rise to > about > > 50F over ambient. > > > > This for a water cooled Subaru engine, radiators in the wings of my > aircraft > > and no baffles at the top of the engine. Measurement taken at the top of > the > > firewall. > > > > > > > -----Original Message----- > > > From: owner-engines-list-server@matronics.com > [mailto:owner-engines-list- > > > server@matronics.com] On Behalf Of Gene Smith > > > Sent: zaterdag 26 november 2005 4:31 > > > To: engines-list@matronics.com > > > Subject: Re: Engines-List: Aluminum tape > > > > > > --> Engines-List message posted by: "Gene Smith" > > > > > > Hans..........Lets go back to basics, maybe we are way off base here > if > we > > > have a drastic different type of aircraft...I have a Van's RV-4, with > a > > > Lyc. > > > 0320 160 Hp...Please identify your type of aircraft and the engine you > > > have......Thanks.......CHEERS!!!! > > > > > > > > > ----- Original Message ----- > > > From: "Hans Teijgeler" > > > To: > > > Subject: RE: Engines-List: Aluminum tape > > > > > > > > > > --> Engines-List message posted by: "Hans Teijgeler" > > > > > > > > > I taped mine on a clean cowl (newly made). It has lasted very well. > > > > > > > > Hans > > > > > > > > > -----Original Message----- > > > > > From: owner-engines-list-server@matronics.com > > > [mailto:owner-engines-list- > > > > > server@matronics.com] On Behalf Of Gene Smith > > > > > Sent: vrijdag 25 november 2005 18:35 > > > > > To: engines-list > > > > > Subject: Engines-List: Aluminum tape > > > > > > > > > > --> Engines-List message posted by: "Gene Smith" > > > > > > > > > > > You are correct Jim Stone...........If that tape doesn't curl, > then > > > they > > > > > don't have a heat problem in that area...Also the inside of the > cowl > > > has > > > > > quite a bit of residual oil and etc. which makes the tape adhesive > > > unable > > > > > to stick very well...(it is almost impossible to clean it > > > enough)...Maybe > > > > > it would last for one flight????......................CHEERS!!!! > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >