---------------------------------------------------------- Zenith-List Digest Archive --- Total Messages Posted Thu 11/01/07: 12 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 12:43 AM - November is Matronics Email List Fund Raiser Month! (Matt Dralle) 1. 03:51 AM - Re: Streamline Struts on a 701 (David Downey) 2. 04:13 AM - RE : Re: Streamline Struts on a 701 (Jean-Paul Roy) 3. 06:53 AM - Re: Streamline Struts on a 701 (LRM) 4. 09:42 AM - Re: Streamline Struts on a 701 (George Swinford) 5. 11:48 AM - Re: Re: Jabiru Cooling (japhillipsga@aol.com) 6. 12:01 PM - Corrosion X Availability (Dave Nixon) 7. 02:38 PM - CH-701: Sources for Rotax engines (John Marzulli) 8. 03:09 PM - Re: Re: Jabiru Cooling (Juan Vega) 9. 03:09 PM - Re: Re: Jabiru Cooling (Juan Vega) 10. 04:55 PM - Re: Missing pages (Craig Payne) 11. 09:38 PM - Re: Piano hinged ailerons (Dave Thompson) ________________________________ Message 0 _____________________________________ Time: 12:43:20 AM PST US From: Matt Dralle Subject: Zenith-List: November is Matronics Email List Fund Raiser Month! Dear Listers, You've probably noticed that there are no banner ads or pop-up windows or spam from any of the List and Forum services at Matronics. These include, for example: The Email List Postings - http://www.matronics.com/listbrowse The Email List Forum Site - http://forums.matronics.com The List Wiki - http://wiki.matronics.com The List Search Engine - http://www.matronics.com/search This is because I have always enjoyed a List experience that was completely about the sport we enjoy - airplanes - and not about advertising! But running a high performance, highly available service like this isn't free and a fair amount of money in terms of computer upgrades, business-class Internet connectivity, and electricity. Consequently, many similar sites turn to advertising to support these costs. Advertising that you have to look at each and every time you read an email message or browse the their web site. Rather than subject my List community to another constant commercial bombardment, I have chosen to hold a PBS-like fund raiser each year in November to support the continued operation and upgrade of the List services. It's solely through the Contributions of List members that the Lists and Forums continue to be possible! During the month, I will be sending out a Fund Raiser reminder message every few days and I ask for your patience and understanding during the month throughout these regular messages. Think of them as PBS' Pledge Breaks... :-) To minimize the impact of the Fund Raiser on the List community, I implemented a new feature late last year specifically related to making Contributions. If you are an Email List subscriber, once you make a Contribution using the online web site, you will no longer receive the email from me regarding the Fund Raiser! There are a couple of exceptions to this, however. If someone replies to a Contribution message I've sent, you might receive that. Additionally, the messages will always be posted to the Forums site. To a first order, however, once you make a Contribution, you won't get my email messages about the Fund Raiser for the rest of the month. For Contributions by check, the squelch will take effect once the check is received. There is a whole new line up of really great Contribution gifts this year! When you make a qualifying Contribution, you can select one of the many free gifts that are available during the Fund Raiser. These gifts are provided through the generous support of a number of our industry's leading supporters including: Bob Nuckolls - AeroElectric - http://www.aeroelectric.com Andy Gold - Builder's Bookstore - http://www.buildersbooks.com Jon Croke - HomebuiltHELP - http://www.homebuilthelp.com Please visit these guy's respective sites, as they have some great products to offer and are generously supporting the Matronics List Fund Raiser. You can make your List Contribution using any one of three secure methods this year including using a credit card, PayPal, or by personal check. From the Contribution site, you can select any one of this year's free gifts with a qualifying Contribution amount. The Contribution page is pretty loooonnnnng this year in order to list great selection of great gifts available so be sure to scroll all the way to the bottom of the web page to see everything that's available! Please make a List Support Contribution: http://www.matronics.com/contribution I would like to thank everyone in advance for their generous support! Your Contributions truely keep this operation afloat! Thank you, Matt Dralle Matronics Email List Forum Administrator ________________________________ Message 1 _____________________________________ Time: 03:51:33 AM PST US From: David Downey Subject: Re: Zenith-List: Streamline Struts on a 701 Hi George;=0A=0AThe basis for the last comment was the (almost) loss of a W aco UPF-7 that I rebuilt from 3 hangars full of parts about 25 years ago. O n the first flight, the driving strut between the ailerons on the right han d side (had a very minor arch - less than 1/4" in almost 6 feet of length) went unstable and started fluttering. As it turned out, it neded to be perf ectly straight to work without risk. A very small stabilizing force at mid length would have precluded that phenomenon.=0A=0AMy apologies to all who r ead offense into the comment posted. It was not meant the way that even I r ead it when it showed up!=0A=0ADave Downey=0AHarleysville (SE) PA=0A100 HP Corvair=0A=0A=0A=0A----- Original Message ----=0AFrom: George Swinford =0ATo: zenith-list@matronics.com=0ASent: Wednesday, Octobe r 31, 2007 10:06:25 PM=0ASubject: Re: Zenith-List: Streamline Struts on a 7 01=0A=0A=0ADave:=0A =0ASpeaking as a (retired) aeronautical engineer, I sec ond your comments, though I take some exception to your last sentence. Giv en that Chris Heintz is a professional designer, I'm sure the 701 does requ ire the jury struts. Otherwise he wouldn't have accepted the complexity, w eight, drag and cost. The alternative would have been a larger diameter or heavier-walled strut to get the same resistance to buckling under a compre ssion load. It is not a question of vibration nor some property of streaml ine tubing as such. The fact that some other design doesn't employ jury s truts means that the other designer has chosen a different solution to prov iding the necessary compression strength.=0A =0AIf the increase in cruise s peed seems worth the effort a streamline fairing for the strut seems a good solution.=0A =0AGeorge Swinford.=0A----- Original Message ----- =0AFrom: D avid Downey =0ATo: zenith-list@matronics.com =0ASent: Wednesday, October 31 , 2007 6:51 PM=0ASubject: Re: Zenith-List: Streamline Struts on a 701=0A=0A =0ADoesn't anyone out there understand that the purpose of the jury strut i s to stabilize the wing strut in buckling? During any intentional or uninte ntional negative G excursions, the strut wants to bend/buckle. The jury str ut (while usually pretty flimsy) effectively holds that instability off to a MUCH greater load.=0A=0AEven if the design does not require them, they ar e desirable for that reason alone.=0A =0ADave Downey=0AHarleysville (SE) PA =0A100 HP Corvair=0A=0A=0A=0A----- Original Message ----=0AFrom: LRM =0ATo: zenith-list@matronics.com=0ASent: Wednesday, October 31, 2007 6:59:38 PM=0ASubject: Re: Zenith-List: Streamline Struts on a 701=0A =0A=0AI'm not so sure I agree that the jury struts are needed if streamline struts are used. My PegaStol wings only have streamline struts as does th e Savannah. Most wings that have streamline struts do not employ jury stru ts. I know some highwings do use both streamline and jury struts, but it i s not the general rule. Perhaps jury struts are only needed to stabilize t he harmonics set up with round tubing whereas streamline struts do not caus e any such harmonics or vibration. Having now built both the Zenith wing and PegaStol wing I don't think the Zenith wings have a structure need for the jury struts, they simply keep the tubes from humming and add unneeded w eight and drag. Larry=0A----- Original Message ----- =0AFrom: ZodieRocket =0ATo: zenith-list@matronics.com =0ASent: Wednesday, October 31, 2007 6:49 PM=0ASubject: RE: Zenith-List: Streamline Struts on a 701=0A=0A=0ALarry and others, I have designed a custom streamline extrusion for my float attachm ents and for the Struts of the STOL aircraft. I will be making Streamline S trut kits in the new year. The Jury struts will remain to remove any chance of wing harmonics( flexing). On average, this single step has improved cru ise by 5 mph. The same can be achieved by simply wrapping the round struts with .016 and solid riveting the trailing edge. THE Magic # is 3-1 so for e very inch in width add 3 inches in total length.=0A =0AMark Townsend=0ACan- Zac Aviation Ltd.=0Apresident@can-zacaviation.com=0Awww.can-zacaviation.com =0A =0A-----Original Message-----=0AFrom: owner-zenith-list-server@matroni cs.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of LRM=0AS ent: Wednesday, October 31, 2007 8:32 AM=0ATo: zenith-list@matronics.com=0A Subject: Zenith-List: Streamline Struts on a 701=0A =0AA question for my le arned fellow builders. Should one replace the round tube struts on a 701 w ith streamline struts can the jury struts be eliminated? If yes, why. If no, why. =0A =0ALarry, www.SkyHawg.com, N1345L=0A =0A =0A=0A - The Zenith-List Email Forum -=0A=0A=0A=0A=0A --> http://www.matronics.com /Navigator?Zenith-List=0A=0A - NEW MATRONICS WEB FORUMS -=0A =0A --> http://forums.matronics.com=0A=0A =0A=0A10/31/2007 10:06 AM=0A =0A=0A10/31/2007 10:06 AM=0A=0A=0A=0Ahref="http://www.matronics.com/Navig ator?Zenith-List">http://www.matronhref="http://forums.matronics.com">htt p://forums.matronics.com=0A=0A=0ARelease Date: 10/31/2007 10:06 AM=0A=0A=0A r?Zenith-List" target=_blank rel=nofollow>http://www.matronics.com/Navi ===========0A=0A=0A=0A=0A/mail.yahoo.com =0A=0A=0Ahref ="http://www.matronics.com/Navigator?Zenith-List">http://www.matronhref ="http://forums.matronics.com">http://forums.matronics.com=0A=0A=0A=0A=0A =========================0A ===============0A=0A___________________________ ________________________________ Message 2 _____________________________________ Time: 04:13:45 AM PST US From: Jean-Paul Roy Subject: RE : Re: Zenith-List: Streamline Struts on a 701 Hello Bob, where did you buy the plastic struts cover from? Jean-Paul Roy CH 701 BUILDING WING NYTerminat@aol.com a crit : In a message dated 10/31/2007 10:04:50 P.M. Eastern Daylight Time, lrm@skyhawg.com writes: Having now built both the Zenith wing and PegaStol wing I don't think the Zenith wings have a structure need for the jury struts, they simply keep the tubes from humming and add unneeded weight and drag. Larry Larry, I can't remember where I read it but I believe the jury struts keep it from humming as you said and also in a negative G condition they keep the struts from bending. I have seen many ultralights that have removed their tube struts and jury struts and replaced with only aluminum streamline struts. I put on the plastic streamline struts over the tube struts and saw an 8mph increase along with having to repitch the prop to keep from over revving. Could not believe how much drag is caused by those tube struts. Bob Spudis N701ZX/ CH701/ 140hrs --------------------------------- --------------------------------- Combattez les mchants pourriels... Le filtre SpamGuard vous aide lutter efficacement contre les pourriels sur le Tout-nouveau Yahoo! Courriel ________________________________ Message 3 _____________________________________ Time: 06:53:26 AM PST US From: "LRM" Subject: Re: Zenith-List: Streamline Struts on a 701 I pretty much agree with leaving the struts on, mainly because I am not sure enough to risk removing them. However, I will make one comment. The 701 strut design is a matter of ease and less expensive than real streamline struts. That is the sole reason tubing is used. One must also remember that the 701 is developed to be what it is, low and slow. It was never intended to have a fast cruise, that's our wish. It's design functions were accomplished and that is where Chris quit. Larry ----- Original Message ----- From: George Swinford To: zenith-list@matronics.com Sent: Thursday, November 01, 2007 12:06 AM Subject: Re: Zenith-List: Streamline Struts on a 701 Dave: Speaking as a (retired) aeronautical engineer, I second your comments, though I take some exception to your last sentence. Given that Chris Heintz is a professional designer, I'm sure the 701 does require the jury struts. Otherwise he wouldn't have accepted the complexity, weight, drag and cost. The alternative would have been a larger diameter or heavier-walled strut to get the same resistance to buckling under a compression load. It is not a question of vibration nor some property of streamline tubing as such. The fact that some other design doesn't employ jury struts means that the other designer has chosen a different solution to providing the necessary compression strength. If the increase in cruise speed seems worth the effort a streamline fairing for the strut seems a good solution. George Swinford. ----- Original Message ----- From: David Downey To: zenith-list@matronics.com Sent: Wednesday, October 31, 2007 6:51 PM Subject: Re: Zenith-List: Streamline Struts on a 701 Doesn't anyone out there understand that the purpose of the jury strut is to stabilize the wing strut in buckling? During any intentional or unintentional negative G excursions, the strut wants to bend/buckle. The jury strut (while usually pretty flimsy) effectively holds that instability off to a MUCH greater load. Even if the design does not require them, they are desirable for that reason alone. Dave Downey Harleysville (SE) PA 100 HP Corvair ----- Original Message ---- From: LRM To: zenith-list@matronics.com Sent: Wednesday, October 31, 2007 6:59:38 PM Subject: Re: Zenith-List: Streamline Struts on a 701 I'm not so sure I agree that the jury struts are needed if streamline struts are used. My PegaStol wings only have streamline struts as does the Savannah. Most wings that have streamline struts do not employ jury struts. I know some highwings do use both streamline and jury struts, but it is not the general rule. Perhaps jury struts are only needed to stabilize the harmonics set up with round tubing whereas streamline struts do not cause any such harmonics or vibration. Having now built both the Zenith wing and PegaStol wing I don't think the Zenith wings have a structure need for the jury struts, they simply keep the tubes from humming and add unneeded weight and drag. Larry ----- Original Message ----- From: ZodieRocket To: zenith-list@matronics.com Sent: Wednesday, October 31, 2007 6:49 PM Subject: RE: Zenith-List: Streamline Struts on a 701 Larry and others, I have designed a custom streamline extrusion for my float attachments and for the Struts of the STOL aircraft. I will be making Streamline Strut kits in the new year. The Jury struts will remain to remove any chance of wing harmonics( flexing). On average, this single step has improved cruise by 5 mph. The same can be achieved by simply wrapping the round struts with .016 and solid riveting the trailing edge. THE Magic # is 3-1 so for every inch in width add 3 inches in total length. Mark Townsend Can-Zac Aviation Ltd. president@can-zacaviation.com www.can-zacaviation.com -----Original Message----- From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of LRM Sent: Wednesday, October 31, 2007 8:32 AM To: zenith-list@matronics.com Subject: Zenith-List: Streamline Struts on a 701 A question for my learned fellow builders. Should one replace the round tube struts on a 701 with streamline struts can the jury struts be eliminated? If yes, why. If no, why. Larry, www.SkyHawg.com, N1345L - The Zenith-List Email Forum - --> http://www.matronics.com/Navigator?Zenith-List - NEW MATRONICS WEB FORUMS - --> http://forums.matronics.com 10/31/2007 10:06 AM 10/31/2007 10:06 AM href="http://www.matronics.com/Navigator?Zenith-List">http://www.matron href="http://forums.matronics.com">http://forums.matronics.com Release Date: 10/31/2007 10:06 AM r?Zenith-List" target=_blank rel=nofollow>http://www.matronics.com/Navi========== /mail.yahoo.com href="http://www.matronics.com/Navigator?Zenith-List">http://www.matron href="http://forums.matronics.com">http://forums.matronics.com ------------------------------------------------------------------------- --- Release Date: 10/31/2007 10:06 AM ------------------------------------------------------------------------- ----- 10/31/2007 10:06 AM ________________________________ Message 4 _____________________________________ Time: 09:42:18 AM PST US From: "George Swinford" Subject: Re: Zenith-List: Streamline Struts on a 701 Dave: Certainly no offense taken on my part. I was waiting for someone to point out the purpose of the jury strut. As you note, it only takes a little eccentricity to make a structural column unstable. In the case of the Waco. the fact that the strut was part of the aileron system rather than being a fixed member made it more susceptible to vibration. George Do not archive ----- Original Message ----- From: David Downey To: zenith-list@matronics.com Sent: Thursday, November 01, 2007 2:50 AM Subject: Re: Zenith-List: Streamline Struts on a 701 Hi George; The basis for the last comment was the (almost) loss of a Waco UPF-7 that I rebuilt from 3 hangars full of parts about 25 years ago. On the first flight, the driving strut between the ailerons on the right hand side (had a very minor arch - less than 1/4" in almost 6 feet of length) went unstable and started fluttering. As it turned out, it neded to be perfectly straight to work without risk. A very small stabilizing force at mid length would have precluded that phenomenon. My apologies to all who read offense into the comment posted. It was not meant the way that even I read it when it showed up! Dave Downey Harleysville (SE) PA 100 HP Corvair ----- Original Message ---- From: George Swinford To: zenith-list@matronics.com Sent: Wednesday, October 31, 2007 10:06:25 PM Subject: Re: Zenith-List: Streamline Struts on a 701 Dave: Speaking as a (retired) aeronautical engineer, I second your comments, though I take some exception to your last sentence. Given that Chris Heintz is a professional designer, I'm sure the 701 does require the jury struts. Otherwise he wouldn't have accepted the complexity, weight, drag and cost. The alternative would have been a larger diameter or heavier-walled strut to get the same resistance to buckling under a compression load. It is not a question of vibration nor some property of streamline tubing as such. The fact that some other design doesn't employ jury struts means that the other designer has chosen a different solution to providing the necessary compression strength. If the increase in cruise speed seems worth the effort a streamline fairing for the strut seems a good solution. George Swinford. ----- Original Message ----- From: David Downey To: zenith-list@matronics.com Sent: Wednesday, October 31, 2007 6:51 PM Subject: Re: Zenith-List: Streamline Struts on a 701 Doesn't anyone out there understand that the purpose of the jury strut is to stabilize the wing strut in buckling? During any intentional or unintentional negative G excursions, the strut wants to bend/buckle. The jury strut (while usually pretty flimsy) effectively holds that instability off to a MUCH greater load. Even if the design does not require them, they are desirable for that reason alone. Dave Downey Harleysville (SE) PA 100 HP Corvair ----- Original Message ---- From: LRM To: zenith-list@matronics.com Sent: Wednesday, October 31, 2007 6:59:38 PM Subject: Re: Zenith-List: Streamline Struts on a 701 I'm not so sure I agree that the jury struts are needed if streamline struts are used. My PegaStol wings only have streamline struts as does the Savannah. Most wings that have streamline struts do not employ jury struts. I know some highwings do use both streamline and jury struts, but it is not the general rule. Perhaps jury struts are only needed to stabilize the harmonics set up with round tubing whereas streamline struts do not cause any such harmonics or vibration. Having now built both the Zenith wing and PegaStol wing I don't think the Zenith wings have a structure need for the jury struts, they simply keep the tubes from humming and add unneeded weight and drag. Larry ----- Original Message ----- From: ZodieRocket To: zenith-list@matronics.com Sent: Wednesday, October 31, 2007 6:49 PM Subject: RE: Zenith-List: Streamline Struts on a 701 Larry and others, I have designed a custom streamline extrusion for my float attachments and for the Struts of the STOL aircraft. I will be making Streamline Strut kits in the new year. The Jury struts will remain to remove any chance of wing harmonics( flexing). On average, this single step has improved cruise by 5 mph. The same can be achieved by simply wrapping the round struts with .016 and solid riveting the trailing edge. THE Magic # is 3-1 so for every inch in width add 3 inches in total length. Mark Townsend Can-Zac Aviation Ltd. president@can-zacaviation.com www.can-zacaviation.com -----Original Message----- From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of LRM Sent: Wednesday, October 31, 2007 8:32 AM To: zenith-list@matronics.com Subject: Zenith-List: Streamline Struts on a 701 A question for my learned fellow builders. Should one replace the round tube struts on a 701 with streamline struts can the jury struts be eliminated? If yes, why. If no, why. Larry, www.SkyHawg.com, N1345L - The Zenith-List Email Forum - --> http://www.matronics.com/Navigator?Zenith-List - NEW MATRONICS WEB FORUMS - --> http://forums.matronics.com 10/31/2007 10:06 AM 10/31/2007 10:06 AM href="http://www.matronics.com/Navigator?Zenith-List">http://www.matron href="http://forums.matronics.com">http://forums.matronics.com Release Date: 10/31/2007 10:06 AM r?Zenith-List" target=_blank rel=nofollow>http://www.matronics.com/Navi========== /mail.yahoo.com href="http://www.matronics.com/Navigator?Zenith-List">http://www.matron href="http://forums.matronics.com">http://forums.matronics.com Release Date: 10/31/2007 10:06 AM http:"http://forums.matronics.com/" target=_blank rel=nofollow>http://forums=============== == _______________________________________________ ------------------------------------------------------------------------- ----- 10/31/2007 10:06 AM ________________________________ Message 5 _____________________________________ Time: 11:48:24 AM PST US Subject: Re: Zenith-List: Re: Jabiru Cooling From: japhillipsga@aol.com Tony, do you have a photo of the lip you added to the cowl bottom ? Hope your doing well and maybe this fall I can get over and visit. Thanks, Bill of Georgia 601XL-3300 120 hrs -----Original Message----- From: T. Graziano Sent: Wed, 31 Oct 2007 1:35 am Subject: Zenith-List: Re: Jabiru Cooling This kind of?extension worked great on my XL this past Summer with temps in the mid to hi 90ies.? I believe the newer Jab FWF packages for the XL have improved cowling for more cooling, in addition to the newer engines having improved ram air ducts and more cooling fin area on the cylinders ?. Tony Graziano 601XL/Jab 3300;? 314 hrs ? Jabiru Cooling From: ???? Rosestar (rosestar@sonic.net) Date: ???? Tue Oct 30 - 10:31 PM I just heard a suggestion last weekend that sounds like it might work. Add a one inch extension strip of aluminum to the "lip" on the aft bottom of the of the lower cowling. Just this much will help create a slip stream in climb and allow the air in the engine compartment to escape. As the cowling is now, there is too much pressure on the bottom cowling starting at a 4% climb to allow the air to escape. This was a simple fix by my new builder friend Ray on his old Luscombe, which the factory adopted to solve its cooling issue years ago. He suggested this to another 601 owner with a Jabiru 3300. At least in climb the cooling should improve. Any thoughts? Brad DeMeo N601BD still working and trying to finish soon ________________________________________________________________________ Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com ________________________________ Message 6 _____________________________________ Time: 12:01:36 PM PST US From: "Dave Nixon" Subject: Zenith-List: Corrosion X Availability I get my CorrosionX at the local marine shop. It is readily available in multitude locations. They have it 16oz. Spray and gallons. Dave Nixon CH601XL 90/90 ________________________________ Message 7 _____________________________________ Time: 02:38:56 PM PST US From: "John Marzulli" Subject: Zenith-List: CH-701: Sources for Rotax engines I started pricing out Rotax 912S engines today, and was surprised to find out about a $3000 price increase ( effective Nov 1, 2007 ) due to the weakening US Dollar. So this brings up two questions 1) Besides Lockwood and Zenith, who else is a reputable source for Rotax 912S engines to the US ( preferably the Pacific NW )? 2) Are there any differences between the way Zenith supplies the Rotax 912S and others supply it ( I.E. Lockwood )? Thanks, -- John Marzulli http://701Builder.blogspot.com/ "Flying a plane is no different than riding a bicycle... it's just a lot harder to put baseball cards in the spokes. -Airplane The Movie DO NOT ARCHIVE ________________________________ Message 8 _____________________________________ Time: 03:09:52 PM PST US From: Juan Vega Subject: Re: Zenith-List: Re: Jabiru Cooling if you go to the jabiru web site, they have dimensions and suggestions on cooling flaps on bottom of cowling. -----Original Message----- >From: japhillipsga@aol.com >Sent: Nov 1, 2007 2:45 PM >To: zenith-list@matronics.com >Subject: Re: Zenith-List: Re: Jabiru Cooling > >Tony, do you have a photo of the lip you added to the cowl bottom ? Hope your doing well and maybe this fall I can get over and visit. Thanks, Bill of Georgia 601XL-3300 120 hrs > > >-----Original Message----- >From: T. Graziano >To: zenith-list@matronics.com >Sent: Wed, 31 Oct 2007 1:35 am >Subject: Zenith-List: Re: Jabiru Cooling > > >This kind of?extension worked great on my XL this past Summer with temps in the mid to hi 90ies.? > >I believe the newer Jab FWF packages for the XL have improved cowling for more cooling, in addition to the newer engines having improved ram air ducts and more cooling fin area on the cylinders > >?. > >Tony Graziano > >601XL/Jab 3300;? 314 hrs > > >? > >Jabiru Cooling > > >From: > >???? > >Rosestar (rosestar@sonic.net) > > >Date: > >???? > >Tue Oct 30 - 10:31 PM > > >I just heard a suggestion last weekend that sounds like it might work. >Add a one inch extension strip of aluminum to the "lip" on the aft >bottom of the of the lower cowling. Just this much will help create a >slip stream in climb and allow the air in the engine compartment to >escape. As the cowling is now, there is too much pressure on the bottom >cowling starting at a 4% climb to allow the air to escape. This was a >simple fix by my new builder friend Ray on his old Luscombe, which the >factory adopted to solve its cooling issue years ago. He suggested this >to another 601 owner with a Jabiru 3300. At least in climb the cooling >should improve. Any thoughts? > >Brad DeMeo >N601BD >still working and trying to finish soon > > >________________________________________________________________________ >Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com ________________________________ Message 9 _____________________________________ Time: 03:09:52 PM PST US From: Juan Vega Subject: Re: Zenith-List: Re: Jabiru Cooling if you go to the jabiru web site, they have dimensions and suggestions on cooling flaps on bottom of cowling. -----Original Message----- >From: japhillipsga@aol.com >Sent: Nov 1, 2007 2:45 PM >To: zenith-list@matronics.com >Subject: Re: Zenith-List: Re: Jabiru Cooling > >Tony, do you have a photo of the lip you added to the cowl bottom ? Hope your doing well and maybe this fall I can get over and visit. Thanks, Bill of Georgia 601XL-3300 120 hrs > > >-----Original Message----- >From: T. Graziano >To: zenith-list@matronics.com >Sent: Wed, 31 Oct 2007 1:35 am >Subject: Zenith-List: Re: Jabiru Cooling > > >This kind of?extension worked great on my XL this past Summer with temps in the mid to hi 90ies.? > >I believe the newer Jab FWF packages for the XL have improved cowling for more cooling, in addition to the newer engines having improved ram air ducts and more cooling fin area on the cylinders > >?. > >Tony Graziano > >601XL/Jab 3300;? 314 hrs > > >? > >Jabiru Cooling > > >From: > >???? > >Rosestar (rosestar@sonic.net) > > >Date: > >???? > >Tue Oct 30 - 10:31 PM > > >I just heard a suggestion last weekend that sounds like it might work. >Add a one inch extension strip of aluminum to the "lip" on the aft >bottom of the of the lower cowling. Just this much will help create a >slip stream in climb and allow the air in the engine compartment to >escape. As the cowling is now, there is too much pressure on the bottom >cowling starting at a 4% climb to allow the air to escape. This was a >simple fix by my new builder friend Ray on his old Luscombe, which the >factory adopted to solve its cooling issue years ago. He suggested this >to another 601 owner with a Jabiru 3300. At least in climb the cooling >should improve. Any thoughts? > >Brad DeMeo >N601BD >still working and trying to finish soon > > >________________________________________________________________________ >Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com ________________________________ Message 10 ____________________________________ Time: 04:55:52 PM PST US From: "Craig Payne" Subject: RE: Zenith-List: Missing pages > All 8 pages 6-B-10 seemed to be all numbered wrong. Page 1 says 1 of 1 and page 2 says 2 of 2 etc thru 8 pages. The 6-B-10 file on my CD is the same, rev 2.1 dated 3/31/05: 1 of 1, 2 of 2, etc. Reading through it there doesn't appear to being any gaps in the narrative. -- Craig ________________________________ Message 11 ____________________________________ Time: 09:38:28 PM PST US From: "Dave Thompson" Subject: Re: Zenith-List: Piano hinged ailerons Guys, I'm not building so you can take this accordingly: About two years ago I went to the Flycorvair.com hanger. I looked over all the cool stuff there. As I talked with Gus, their pilot, I asked his opinion of the hinged ailerons vs. the flex skin. They had recently done a conversion from flex to hinge on their 601XL td. What I got out of the discussion was that the flex tends to center the controls more and the controls were, I think he said stiffer. The hinges were more responsive but you had to pay more attention. Later I visited Mark Townsend's house and he something like the flex would be better for cross country and the hinges would be great for tooling around the patch. What are you guy's opinions. Mark & Gus, did I repeat you accurately? I'm just curious. Do not archive Dave Thompson ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith-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/zenith-list Browse Digests http://www.matronics.com/digest/zenith-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.