---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Tue 11/06/12: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 12:15 AM - A Message From AeroElectric's Bob Nuckolls... (Matt Dralle) 1. 12:55 AM - Landing Gear Shimmy on RV8a (Charles Brame) 2. 03:49 AM - Re: Landing Gear Shimmy on RV8a (Hopperdhh@aol.com) 3. 06:56 AM - Re: Landing Gear Shimmy on RV8a (mr.gsun@gmail.com) 4. 06:58 AM - Re: Landing Gear Shimmy on RV8a (Charles Kuss) 5. 07:16 AM - Re: Landing Gear Shimmy on RV8a (Robin Marks) 6. 08:55 AM - Re: Landing Gear Shimmy on RV8a (thomas sargent) 7. 01:31 PM - Re: Landing Gear Shimmy on RV8a (Doug Weiler) ________________________________ Message 0 _____________________________________ Time: 12:15:24 AM PST US From: Matt Dralle Subject: RV-List: A Message From AeroElectric's Bob Nuckolls... Dear Listers, The well known Bob Nuckolls of the AeroElectric posted a great message Monday on the AeroElectric-List regarding the Matronics Lists and the importance of supporting the operation during the Fund Raiser. Please take a minute to read Bob's commentary below, reposted to the other Matronics Lists with his permission... Date: Mon, 05 Nov 2012 08:58:41 -0600 From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Re: Please Make A Contribution Today! At 02:14 AM 11/5/2012, Matt Dralle wrote: > > Each year at the end of the List Fund Raiser, I post a message > acknowledging everyone that so generously made a Contribution to > support the Lists. Its my way of publicly thanking everyone that > took a minute to show their appreciation for the Lists. > I will add my voice to this suggestion. It's easy to enjoy the benefits of what's available to us off-the-shelves at the corner mega-marts. It's seldom that we give pause to learn and understand the processes and tools that made it possible to reach out and select from dozens of options. This, and all civil societies, runs on talent, energy and mobility. Mobility exploited by thousands of hands, machines and transportation that figure into the 'infrastructure' that puts the boxes of Wheaties and Pop Tarts on the shelves. See "I pencil" http://tinyurl.com/36xkhq Any break in that chain of time, talent and resources at least interrupts if not totally halts flow of that benefit. Matt's room full of byte-thrashers is like the natural gas pumping station a few miles from my house. If those pumps stop, who ever is expecting the furnace to come on at the other end of the pipe is at risk for reduced service and/or higher costs for that service. Matt's yearly endeavor to keep his pumps running is a trivial burden on the members of the Lists but of incalculable value to those who participate on them. No donation is too small. We go to a fly-in a willingly chuck a few bucks into the coffee can at the drinks and donuts table, let's chuck a few bucks into Matt's coffee can too. 50,000 pounds of value doesn't get to the shelves on time if one 18-wheeler runs out of gas. The T-bytes of data flow we all enjoy don't get from your keyboard to the screens of others unless Matt pays the light bill and strokes the machines to keep them happy. No, $5 won't get you a free copy of the 'Connection or a fuel sampler but it will go toward the assurance that logging onto your favorite List will open doors that you would be sorely missed should you find that hitting the return key doesn't produce the expected response. $5 from every List customer on Matt's system will go a very long way to keeping the byte-pumps running. $More$ will go a long way to upgrading the size and quality of the machines as the old ones get long in the tooth. No matter what size of donation you choose . . . please do it now . . . Bob . . . Please make your Contribution today to support the continued operation and upgrade of these services. You can pick up a really nice gift for making your Contribution too! You may use a Credit Card or Paypal at the Matronics Contribution Site here: http://www.matronics.com/contribution or, you can send a personal check to the following address: Matronics / Matt Dralle 581 Jeannie Way Livermore, CA 94550 Matt Dralle Matronics Email List Administrator ________________________________ Message 1 _____________________________________ Time: 12:55:13 AM PST US From: Charles Brame Subject: RV-List: Landing Gear Shimmy on RV8a I had similar shimmy problems on my 6A. I tried balancing the tires with little or no help. Van's answer was to reduce the tire pressure. As I remember, Van's recommendation was about 20 psi. My shimmy stopped at 25 psi and I have used that ever since. I have found that lower to higher ambient temperature will change the tire pressure enough that the shimmy will sometimes return. Likewise, my 25 psi flatland tire pressure didn't work in Denver, and lowering the tire pressure to less than 20 psi solved that. Another possible cause is the axle nut(s) being too tight. Make sure all the tires will spin freely with the airplane jacked up. I had that problem with the nose gear which caused the nose gear to bounce vertically on landing. Basically, the axle was too tight due to the design, and the tire wouldn't freely rotate more than 1/2 turn. I went to a Grove wheel and axle and that solved that problem. Charlie Brame RV-6A N11CB San Antonio ----------------------------------------------------------- > Time: 03:08:03 PM PST US > Subject: RV-List: Landing Gear Shimmy on RV8a > From: "fastpilotrv8" > > > I on my 2002 RV8a has had the landing gear shimmy has gotten much > worse in the > last 6 flights . I am running 45 lbs air , no flats spots . The > mains are really > shaking a lot. anyone with Ideas please watch the video on You Tube > and > please give me your Ideas > > http://www.youtube.com/watch?v=_HrcTKt3zBc > > my email is fastpilotrv8@aol.com ________________________________ Message 2 _____________________________________ Time: 03:49:32 AM PST US From: Hopperdhh@aol.com Subject: Re: RV-List: Landing Gear Shimmy on RV8a Hi ??, The nose wheel looks to have low tire pressure but does not shake. Could it be the mains have too much pressure? I run about 38 to start with in my RV7A (200 HP) mains. By the time I add air they're usually down to about 32. I've been told they shake a lot though. What changed in the last 6 flights? Do the wheels turn free, or are the bearings too loose? Maybe clean up the bearings and look for signs of corrosion, etc. Could it be that it has always done this and you just became aware of it? Look at the brakes,too. Could they be getting into the act somehow? Back to the nose wheel. I have the AntiSplat gear leg brace, and now run 50 PSI in the nose tire. Only have a few hours since putting it on. So far, so good! Just some ideas. Dan Hopper N766DH In a message dated 11/5/2012 6:08:35 P.M. Eastern Standard Time, fastpilotrv8@aol.com writes: --> RV-List message posted by: "fastpilotrv8" I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in the last 6 flights . I am running 45 lbs air , no flats spots . The mains are really shaking a lot. anyone with Ideas please watch the video on You Tube and please give me your Ideas http://www.youtube.com/watch?v=_HrcTKt3zBc my email is fastpilotrv8@aol.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=386965#386965 ________________________________ Message 3 _____________________________________ Time: 06:56:41 AM PST US Subject: Re: RV-List: Landing Gear Shimmy on RV8a From: mr.gsun@gmail.com My thought when I saw your video was that something is loose. Did you jack it up and really wiggle everything good? I run 35-37 psI and have a small amount of shimmy sometimes when increasing taxi speed. If I touch the brakes, it goes away and all is well. I found that lower pressure helps my landings, eliminates shimmy but rubs on the wheel pants on touchdown. Rubbing on the sidewalls of my expensive Michelin tires bothered me. How do you attach your camera to the wing? I see the suction cups for the GoPro camera but just don't trust that. Do you back out a few screws from the wing and screw down a mounting plate? Greg do not archive On Tue, Nov 6, 2012 at 12:54 AM, Charles Brame wrote: > I had similar shimmy problems on my 6A. I tried balancing the tires with > little or no help. Van's answer was to reduce the tire pressure. As I > remember, Van's recommendation was about 20 psi. My shimmy stopped at 25 > psi and I have used that ever since. I have found that lower to higher > ambient temperature will change the tire pressure enough that the shimmy > will sometimes return. Likewise, my 25 psi flatland tire pressure didn't > work in Denver, and lowering the tire pressure to less than 20 psi solved > that. > > Another possible cause is the axle nut(s) being too tight. Make sure all > the tires will spin freely with the airplane jacked up. I had that problem > with the nose gear which caused the nose gear to bounce vertically on > landing. Basically, the axle was too tight due to the design, and the tire > wouldn't freely rotate more than 1/2 turn. I went to a Grove wheel and > axle and that solved that problem. > > Charlie Brame > RV-6A N11CB > San Antonio > > ----------------------------------------------------------- > > > Time: 03:08:03 PM PST US > Subject: RV-List: Landing Gear Shimmy on RV8a > From: "fastpilotrv8" > > > I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in > the > last 6 flights . I am running 45 lbs air , no flats spots . The mains > are really > shaking a lot. anyone with Ideas please watch the video on You Tube and > please give me your Ideas > > http://www.youtube.com/watch?v=_HrcTKt3zBc > > my email is fastpilotrv8@aol.com > > * > > * > > ________________________________ Message 4 _____________________________________ Time: 06:58:59 AM PST US From: Charles Kuss Subject: RE: RV-List: Landing Gear Shimmy on RV8a Robin, -Is there a way to visually determine if you have the 9A legs? How do the y differ from the 8A units? Charlie --- On Mon, 11/5/12, Robin Marks wrote: From: Robin Marks Subject: RE: RV-List: Landing Gear Shimmy on RV8a Ok, I hate to take you way off the reservation here but Vans miss-shipped s ome RV-8A kits with RV-9A gear legs. Ask me how I know? I purchased a parti ally built kit from about your era (Builder # 80721) and it shipped with th e 9A legs. We knew something was not right when we tried to align the wheel s. This was most obvious when pushing backwards. The only reason I of know this is the same thing happened to at least 2 other 8A builders that contac ted me through the list. We cleaned up the legs and returned them to Vans f or a free replacement ~8+ years later. (Thank you Vans!). At least one flew several hours before discovering the issue. Mine would not push backwards more than a few feet w/o skipping so I have no idea one can push in/out the plane in this configuration. Now this is pretty unlikely to be your issue and I am sure that others will chime in on the shimmy problem. Just wanted to let you know of the gear leg issue just in case. Robin -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matro nics.com] On Behalf Of fastpilotrv8 Sent: Monday, November 05, 2012 3:07 PM Subject: RV-List: Landing Gear Shimmy on RV8a I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in the last 6 flights .- I am running 45 lbs air , no flats spots .- The m ains are really shaking a lot.- anyone with Ideas please watch the video on You Tube and please give me your Ideas http://www.youtube.com/watch?v=_HrcTKt3zBc my email is- - fastpilotrv8@aol.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=386965#386965 le, List Admin. ________________________________ Message 5 _____________________________________ Time: 07:16:20 AM PST US From: Robin Marks Subject: RE: RV-List: Landing Gear Shimmy on RV8a I don't know if you can tell visually but they will be a touch "toe in" and when rolling the plane in reverse they will splay a bit and then skip. It seemed to roll forward more normally then it would when pushed in reverse. The alignment was not immediately obvious (just a few degrees) but the reve rse push test made the misalignment obvious. Good luck, Robin From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matro nics.com] On Behalf Of Charles Kuss Sent: Tuesday, November 06, 2012 6:59 AM Subject: RE: RV-List: Landing Gear Shimmy on RV8a Robin, Is there a way to visually determine if you have the 9A legs? How do they differ from the 8A units? Charlie --- On Mon, 11/5/12, Robin Marks > wrote: From: Robin Marks > Subject: RE: RV-List: Landing Gear Shimmy on RV8a s.com> se?to=robin@painttheweb.com>> Ok, I hate to take you way off the reservation here but Vans miss-shipped s ome RV-8A kits with RV-9A gear legs. Ask me how I know? I purchased a parti ally built kit from about your era (Builder # 80721) and it shipped with th e 9A legs. We knew something was not right when we tried to align the wheel s. This was most obvious when pushing backwards. The only reason I of know this is the same thing happened to at least 2 other 8A builders that contac ted me through the list. We cleaned up the legs and returned them to Vans f or a free replacement ~8+ years later. (Thank you Vans!). At least one flew several hours before discovering the issue. Mine would not push backwards more than a few feet w/o skipping so I have no idea one can push in/out the plane in this configuration. Now this is pretty unlikely to be your issue and I am sure that others will chime in on the shimmy problem. Just wanted to let you know of the gear leg issue just in case. Robin -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of fastpilotrv8 Sent: Monday, November 05, 2012 3:07 PM Subject: RV-List: Landing Gear Shimmy on RV8a pose?to=fastpilotrv8@aol.com>> I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in the last 6 flights . I am running 45 lbs air , no flats spots . The mains are really shaking a lot. anyone with Ideas please watch the video on You Tube and please give me your Ideas http://www.youtube.com/watch?v=_HrcTKt3zBc my email is fastpilotrv8@aol.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=386965#386965 * The Builder's Bookstore www.buildersbooks.com --> http://www.m============ rsbooks.com> m> ________________________________ Message 6 _____________________________________ Time: 08:55:22 AM PST US Subject: Re: RV-List: Landing Gear Shimmy on RV8a From: thomas sargent I had a similar problem on my RV-6A. Lower tire pressure helped. What solved the problem was replacing the original equipment tires (which wore out in a year anyway) with Michelin Condors. I normally keep 30 - 32ps in the tires. -- Tom Sargent ________________________________ Message 7 _____________________________________ Time: 01:31:53 PM PST US From: Doug Weiler Subject: Re: RV-List: Landing Gear Shimmy on RV8a I'd try two things. Bring the tire pressure down to about 30 psi. If that doesn't work I'd change the brand of tires. I had similar issues with my first RV-4 and this process worked. Doug Weiler RV-4 finished and flying RV-7 finished and flying On 11/5/2012 5:07 PM, fastpilotrv8 wrote: > > I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in the last 6 flights . I am running 45 lbs air , no flats spots . The mains are really shaking a lot. anyone with Ideas please watch the video on You Tube and please give me your Ideas > > http://www.youtube.com/watch?v=_HrcTKt3zBc > > my email is fastpilotrv8@aol.com > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=386965#386965 > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-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/rv-list Browse Digests http://www.matronics.com/digest/rv-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.