---------------------------------------------------------- RV10-List Digest Archive --- Total Messages Posted Mon 08/20/12: 17 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:20 AM - Re: Shudder/shimmy on landing/ brakes/tires and other stuff I want to talk about (Kelly McMullen) 2. 04:22 AM - Re: Re: Main gear shudder revisited (retread tires) (Kelly McMullen) 3. 04:38 AM - Re: Shudder/shimmy on landing/ brakes/tires and other stuff I want to talk about (Seano) 4. 07:27 AM - Re: Shudder/shimmy on landing (rv10flyer) 5. 07:42 AM - Re: RV-10 Battery (rv10flyer) 6. 07:50 AM - Re: Re: Main gear shudder revisited (retread tires) (PReid) 7. 08:28 AM - Re: Re: Main gear shudder revisited (retread tires) (Alan Mekler MD) 8. 09:05 AM - Re: Re: Main gear shudder revisited (retread tires) (PReid) 9. 09:13 AM - Re: Re: Main gear shudder revisited (retread tires) (Alan Mekler MD) 10. 03:32 PM - Re: Re: Shudder/shimmy on landing (Roger Standley) 11. 04:45 PM - Re: Re: Shudder/shimmy on landing (Seano) 12. 05:30 PM - Re: Re: Shudder/shimmy on landing (Roger Standley) 13. 06:40 PM - Re: Shudder/shimmy on landing (amekler) 14. 06:41 PM - Re: Shudder/shimmy on landing (Tim Lewis) 15. 07:22 PM - Re: Re: Shudder/shimmy on landing (Don McDonald) 16. 10:10 PM - Re: Re: Shudder/shimmy on landing (Steve T) 17. 10:19 PM - Gear leg stiffener update (Steve T) ________________________________ Message 1 _____________________________________ Time: 04:20:56 AM PST US Subject: Re: RV10-List: Shudder/shimmy on landing/ brakes/tires and other stuff I want to talk about From: Kelly McMullen Sean, You can correct the brake caliper problem, no need for new hardware. You can find some brake silicone lube at any National Aircraft Parts Assn store (aka NAPA0 or equivalent. Lube the pins(and nothing else). If you have 5606 fluid in your brake system and any seeped out at the caliper that can also cause it to stick, as well as being fire hazard. Good excuse to change the system over to the better high temperature fluid. Kelly On Sun, Aug 19, 2012 at 8:26 PM, Seano wrote: > Also started to get some brake drag on the left caliper. Noticed the slop > on the pins and a little rubbing on the caliper from the edge of the rotor. > Anyone else notice this? > I may talk to Matco about aftermarket brake parts. ________________________________ Message 2 _____________________________________ Time: 04:22:08 AM PST US Subject: Re: RV10-List: Re: Main gear shudder revisited (retread tires) From: Kelly McMullen They have fooled you....that is Desser Tire's discount package on Desser's web site. On Sun, Aug 19, 2012 at 9:17 PM, wrote: > > I've spent way too much time looking for the 10% discount package on the > Desser site ... did you perhaps mean this on Van's? > > http://www.vansaircrafttires.com/products/-RV%252d10-Main-Tire-Package-Special-save-10%25-%28two-15%7B47%7D600%252d6PR-Retreads-%26-two-Aero-Classic-Easy-Flate-Tubes%29.html > > Later, - Lew > > do not archive > > -----Original Message----- From: Preid > Sent: Sunday, August 19, 2012 10:21 PM > To: rv10-list@matronics.com > Subject: Re: RV10-List: Re: Main gear shudder revisited (retread tires) > > > > If you go to the RV-10 section of desser They have the retreads for the > rear. There is a10% discount if you get the tires and leakproof tubes( with > valve angle) package. > > ________________________________ Message 3 _____________________________________ Time: 04:38:03 AM PST US From: "Seano" Subject: Re: RV10-List: Shudder/shimmy on landing/ brakes/tires and other stuff I want to talk about Thanks Kelly, I've been using Royco 782 as the fluid with the Viton O-rings from the start. I will try the lube and install the new pads. Seems like a lubed them last inspection in January. ----- Original Message ----- From: "Kelly McMullen" Sent: Monday, August 20, 2012 5:19 AM Subject: Re: RV10-List: Shudder/shimmy on landing/ brakes/tires and other stuff I want to talk about > > Sean, > You can correct the brake caliper problem, no need for new hardware. > You can find some brake silicone lube at any National Aircraft Parts > Assn store (aka NAPA0 or equivalent. Lube the pins(and nothing else). > If you have 5606 fluid in your brake system and any seeped out at the > caliper that can also cause it to stick, as well as being fire hazard. > Good excuse to change the system over to the better high temperature > fluid. > Kelly > > On Sun, Aug 19, 2012 at 8:26 PM, Seano wrote: > >> Also started to get some brake drag on the left caliper. Noticed the >> slop >> on the pins and a little rubbing on the caliper from the edge of the >> rotor. >> Anyone else notice this? >> I may talk to Matco about aftermarket brake parts. > > > ________________________________ Message 4 _____________________________________ Time: 07:27:18 AM PST US Subject: RV10-List: Re: Shudder/shimmy on landing From: "rv10flyer" I like to fly early. I taxied 90* to the morning sun and my nose wheel/pant started the fore-aft oscillation at 15-18 kts GS during phase 1. Since, I have flown with the family near gross wt and have very little shudder/shimmy. I flew up to a pancake breakfast with my 90 lb son/copilot Sat. I could feel an up and down motion from main gear. Hmmm...that's interesting. I know my Van's supplied tires are 5/16" out of round(no reason to balance an out of round tire), but never noticed it during first 25 hrs of testing. All I could think of was maybe I was riding more on the corners of the tires at low fuel/people loading and feeling scalloped tires. I have an entire set of Desser retreads/tubes to install at annual in November. Van's first flight test in the -10 noted a shimmy. They said it was a brake disc .002" off...they knew about this since day one. I believe we will always have problems with our round flexible, twistable gear legs, especially flying lightweight(which Sat was the first time in 50 hrs). So fly at gross and see if it makes a difference with yours. Note: I have reinforced/improved wheel pant mounting, matco nose wheel and orig unbalanced/out of round/crappy tires/tubes. At least they don't leak down! -------- Wayne Gillispie, A&P 05/93 PP 10/08 40983SB 12/1/2009-12/1/2011 N715WD 382nd Flying. TT= 74 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=381352#381352 ________________________________ Message 5 _____________________________________ Time: 07:42:59 AM PST US Subject: RV10-List: Re: RV-10 Battery From: "rv10flyer" One reason I installed an aux PC680 beside my 925. It never happens at home. -------- Wayne Gillispie, A&P 05/93 PP 10/08 40983SB 12/1/2009-12/1/2011 N715WD 382nd Flying. TT= 74 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=381353#381353 ________________________________ Message 6 _____________________________________ Time: 07:50:01 AM PST US Subject: Re: RV10-List: Re: Main gear shudder revisited (retread tires) From: PReid Sorry, yes I did. I thought I had the link to the package but apparently it got lost in the mail. This is the link however. Word of advice, call Desser on the number from the site, the vans link is Desser's dedicated page for the RV. I spent a lot of time with desser getting the deals and parts and they will make an effort to assure you get what you want. The key here is tell them you want a retread with a Good Year core, you can even specify which Good Year tire you want, if they have it in stock you will get that tire. Do not confuse that the retreads are all the same I am saying to specifically as for a Good Year tire that has been retreaded, otherwise you may get a condor with the retread. Desser grabs the next tire in the stack, there is no preference piles but they will look in the stack for a specific core if you ask. If there is any issue, let me know. Pascal On Aug 20, 2012, at 4:21 AM, Kelly McMullen wrote: > > They have fooled you....that is Desser Tire's discount package on > Desser's web site. > > On Sun, Aug 19, 2012 at 9:17 PM, wrote: >> >> I've spent way too much time looking for the 10% discount package on the >> Desser site ... did you perhaps mean this on Van's? >> >> http://www.vansaircrafttires.com/products/-RV%252d10-Main-Tire-Package-Special-save-10%25-%28two-15%7B47%7D600%252d6PR-Retreads-%26-two-Aero-Classic-Easy-Flate-Tubes%29.html >> >> Later, - Lew >> >> do not archive >> >> -----Original Message----- From: Preid >> Sent: Sunday, August 19, 2012 10:21 PM >> To: rv10-list@matronics.com >> Subject: Re: RV10-List: Re: Main gear shudder revisited (retread tires) >> >> >> >> If you go to the RV-10 section of desser They have the retreads for the >> rear. There is a10% discount if you get the tires and leakproof tubes( with >> valve angle) package. >> >> >> >> >> >> >> >> > > > > ________________________________ Message 7 _____________________________________ Time: 08:28:28 AM PST US Subject: Re: RV10-List: Re: Main gear shudder revisited (retread tires) From: Alan Mekler MD My tires are being delivered today. How will i know which retreads i got? Alan Sent from my iPhone On Aug 20, 2012, at 10:49 AM, PReid wrote: > Pascal ________________________________ Message 8 _____________________________________ Time: 09:05:18 AM PST US Subject: Re: RV10-List: Re: Main gear shudder revisited (retread tires) From: PReid The process is all the same regardless of the core used. The difference is in the original tire used to retread it. So if you look at the sidewall it will tell you what core they used for the retread. Some people just like having a certain tire, be it Michelin, Good Year, etc.. So I was just giving a heads up that one can ask for it and Desser will attempt to accommodate that request. Sales will tell you it's all the same however. On Aug 20, 2012, at 8:27 AM, Alan Mekler MD wrote: > > My tires are being delivered today. > How will i know which retreads i got? > Alan > > Sent from my iPhone > > On Aug 20, 2012, at 10:49 AM, PReid wrote: > >> Pascal > > > > ________________________________ Message 9 _____________________________________ Time: 09:13:31 AM PST US Subject: Re: RV10-List: Re: Main gear shudder revisited (retread tires) From: Alan Mekler MD Thanks. I"ll know for the next time I order. Alan Sent from my iPhone On Aug 20, 2012, at 12:04 PM, PReid wrote: > > The process is all the same regardless of the core used. The difference is in the original tire used to retread it. So if you look at the sidewall it will tell you what core they used for the retread. > Some people just like having a certain tire, be it Michelin, Good Year, etc.. So I was just giving a heads up that one can ask for it and Desser will attempt to accommodate that request. Sales will tell you it's all the same however. > > > > On Aug 20, 2012, at 8:27 AM, Alan Mekler MD wrote: > >> >> My tires are being delivered today. >> How will i know which retreads i got? >> Alan >> >> Sent from my iPhone >> >> On Aug 20, 2012, at 10:49 AM, PReid wrote: >> >>> Pascal >> >> >> >> > > > > > ________________________________ Message 10 ____________________________________ Time: 03:32:12 PM PST US From: "Roger Standley" Subject: Re: RV10-List: Re: Shudder/shimmy on landing OK, lets summarize what people have said. There seem to be multiple "triggers" to cause the shudder/shimmy effect on landing. It could be mains and/or nose wheel: light toe in/out, brake disk "off", wheel pants "off", tires "off"...you can take your pick. The point is that the tapered main gear is too sensitive to a variety of "triggers". Lets make the tapered main gear less susceptible by changing the dynamic. Steve T at steve@aircraftspecialty.com has offered to make up stiffeners but needs to know would aluminum or wood work better? How long of a piece are we talking about? I, for one, would like to give this a shot. Roger "mine shudders, too" Standley ----- Original Message ----- From: rv10flyer To: rv10-list@matronics.com Sent: Monday, August 20, 2012 7:26 AM Subject: RV10-List: Re: Shudder/shimmy on landing > I like to fly early. I taxied 90* to the morning sun and my nose wheel/pant started the fore-aft oscillation at 15-18 kts GS during phase 1. Since, I have flown with the family near gross wt and have very little shudder/shimmy. I flew up to a pancake breakfast with my 90 lb son/copilot Sat. I could feel an up and down motion from main gear. Hmmm...that's interesting. I know my Van's supplied tires are 5/16" out of round(no reason to balance an out of round tire), but never noticed it during first 25 hrs of testing. All I could think of was maybe I was riding more on the corners of the tires at low fuel/people loading and feeling scalloped tires. I have an entire set of Desser retreads/tubes to install at annual in November. Van's first flight test in the -10 noted a shimmy. They said it was a brake disc .002" off...they knew about this since day one. I believe we will always have problems with our round flexible, twistable gear legs, especially flying lightweight(which Sat was the first time in 50 hrs). So fly at gross and see if it makes a difference with yours. Note: I have reinforced/improved wheel pant mounting, matco nose wheel and orig unbalanced/out of round/crappy tires/tubes. At least they don't leak down! -------- Wayne Gillispie, A&P 05/93 PP 10/08 40983SB 12/1/2009-12/1/2011 N715WD 382nd Flying. TT= 74 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=381352#381352 http://www.matronics.com/Navigator?RV10-List http://www.matronics.com/contribution ________________________________ Message 11 ____________________________________ Time: 04:45:35 PM PST US Subject: Re: RV10-List: Re: Shudder/shimmy on landing From: Seano Make it too stiff and it may transfer energy to places you don't want it. Sent from my iPhone On Aug 20, 2012, at 16:31, "Roger Standley" wrote: > OK, lets summarize what people have said. There seem to be multiple "trigg ers" to cause the shudder/shimmy effect on landing. It could be mains and/or nose wheel: light toe in/out, brake disk "off", wheel pants "off", tires "o ff"...you can take your pick. The point is that the tapered main gear is too sensitive to a variety of "triggers". Lets make the tapered main gear less susceptible by changing the dynamic. > > Steve T at steve@aircraftspecialty.com has offered to make up stiffeners b ut needs to know would aluminum or wood work better? How long of a piece ar e we talking about? > > I, for one, would like to give this a shot. > > Roger "mine shudders, too" Standley > > > > > ----- Original Message ----- > From: rv10flyer > To: rv10-list@matronics.com > Sent: Monday, August 20, 2012 7:26 AM > Subject: RV10-List: Re: Shudder/shimmy on landing > > > I like to fly early. I taxied 90* to the morning sun and my nose wheel/pan t started the fore-aft oscillation at 15-18 kts GS during phase 1. Since, I have flown with the family near gross wt and have very little shudder/sh immy. I flew up to a pancake breakfast with my 90 lb son/copilot Sat. I coul d feel an up and down motion from main gear. Hmmm...that's interesting. I kn ow my Van's supplied tires are 5/16" out of round(no reason to balance an ou t of round tire), but never noticed it during first 25 hrs of testing. All I could think of was maybe I was riding more on the corners of the tires at l ow fuel/people loading and feeling scalloped tires. I have an entire set of D esser retreads/tubes to install at annual in November. > Van's first flight test in the -10 noted a shimmy. They said it was a brak e disc .002" off...they knew about this since day one. > I believe we will always have problems with our round flexible, twistable g ear legs, especially flying lightweight(which Sat was the first time in 50 h rs). So fly at gross and see if it makes a difference with yours. Note: I ha ve reinforced/improved wheel pant mounting, matco nose wheel and orig unbala nced/out of round/crappy tires/tubes. At least they don't leak down! > > -------- > Wayne Gillispie, A&P 05/93 PP 10/08 > 40983SB 12/1/2009-12/1/2011 > N715WD 382nd Flying. TT= 74 > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=381352#381352 > > > http://www.matronicp; via the Web title=http://forums.matronics.com/ h ref="http://forums.matronics.com">http://forums.matronics.com > _p; generous bsp; title=http://www.matronics. com/contribution href="http://www.matronics.com/contribution">http://www.m atronics.com/c================ > > > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ________________________________ Message 12 ____________________________________ Time: 05:30:11 PM PST US From: Roger Standley Subject: RE: RV10-List: Re: Shudder/shimmy on landing Seano=2C Agreed=2C what size did you use? Subject: Re: RV10-List: Re: Shudder/shimmy on landing From: sean@braunandco.com Make it too stiff and it may transfer energy to places you don't want it. Sent from my iPhone On Aug 20=2C 2012=2C at 16:31=2C "Roger Standley" wrot e: OK=2C lets summarize what people have said. There seem to be multiple "triggers" to cause the shudder/shimmy effect on landing. It could be mains and/or nose wheel: light toe in/out=2C brake disk "off"=2C wheel pants "off "=2C tires "off"...you can take your pick. The point is that the tapered main gear is too sensitive to a variety of "triggers". Lets make the tapered main gear less susceptible by changing the dynamic. Steve T at steve@aircraftspecialty.com has offered to make up stiffeners but needs to know would aluminum or wood work better? How long of a piece are we talking about? I=2C for one=2C would like to give this a shot. Roger "mine shudders=2C too" Standley ----- Original Message ----- From: rv10flyer To: rv10-list@matronics.com Sent: Monday=2C August 20=2C 2012 7:26 AM Subject: RV10-List: Re: Shudder/shimmy on landing I like to fly early. I taxied 90* to the morning sun and my nose wheel/pant started the fore-aft oscillation at 15-18 kts GS during phase 1. Since=2C I have flown with the family near gross wt and have very little shudder/shimmy. I flew up to a pancake breakfast with my 90 lb son/copilo t Sat. I could feel an up and down motion from main gear. Hmmm...that's interesting. I know my Van's supplied tires are 5/16" out of round(no rea son to balance an out of round tire)=2C but never noticed it during first 25 hrs of testing. All I could think of was maybe I was riding more on the corners of the tires at low fuel/people loading and feeling scalloped tires. I have an entire set of Desser retreads/tubes to install at annual in November. Van's first flight test in the -10 noted a shimmy. They said it was a brake disc .002" off...they knew about this since day one. I believe we will always have problems with our round flexible=2C twistable gear legs =2C especially flying lightweight(which Sat was the first time in 50 hrs). So fly at gross and see if it makes a difference with yours. Note: I have reinforced/improved wheel pant mounting=2C matco nose wheel and orig unbalanced/out of round/crappy tires/tubes. At least they don't leak down! -------- Wayne Gillispie=2C A&=3BP 05/93 PP 10/08 40983SB 12/1/2009-12/1/2011 N715WD 382nd Flying. TT= 74 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=381352#381352 http://www.matronicp=3B via the Web title=http://forums.matronics.com/ href="http://forums.matronics.com">http://forums.matronics.com _p=3B generous bsp=3B title=http://www.matronics.com/contribution href="http://www.matronics.com/contribution">http://www.matronics.com/c ================ 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D ________________________________ Message 13 ____________________________________ Time: 06:40:57 PM PST US Subject: RV10-List: Re: Shudder/shimmy on landing From: "amekler" will the RV-14 gear fit on the 10? the wing is the same. Alan Read this topic online here: http://forums.matronics.com/viewtopic.php?p=381430#381430 ________________________________ Message 14 ____________________________________ Time: 06:41:00 PM PST US From: Tim Lewis Subject: Re: RV10-List: Shudder/shimmy on landing Attached is the email I got back from Van's on this topic. -------- Original Message -------- Subject: Re: RV-10 gear leg shimmy From: Sterling The wood stiffener is an option to address the main gear shimmy but more as a last resort. Another way you can help this problem is by simply adjusting the air pressure in your main wheels. This is most likely caused by people having to much pressure in your tires. Try adjusting pressure by two pounds at a time and testing. If this does not work to your satisfaction you will than want to try the wood stiffener method. Sterling -- Tim Lewis -- HEF (Manassas, VA) RV-6A N47TD -- 1104 hrs - sold RV-10 N31TD -- 300 hrs Seano said the following on 8/18/2012 2:05 PM: > > Tim, > > I fiberglassed oak stiffeners on the back of my gear legs. They fit inside the fairing and are basically triangle shaped and milled to fit on the round tapered gear leg. They have really helped with the shimmy. Mine started around 30 kias. > If I'm really light and by myself I feel a little shimmy but much less than ever before the stiffeners. If I have any passengers with me or cargo I have no shimmy at all with the stiffeners. Before it would shimmy in any configuration. > You can try what I did an that was using strapping tape first to try then out. After it worked I prosealed the woo to the gear leg then glasses them in using a spiral technique with 3" glass tape. > > Good luck > I might be delivering a CJ to Manassas at the end of the month. > > > Sent from my iPhone > > On Aug 18, 2012, at 11:35, Tim Lewis wrote: > >> >> Like many RV-10s (apparently), mine shudders during the landing rollout. Mine starts when decelerating through 35-40 knots (or so) on landing. The speed range at which the shudder occurs is only a small number of knots - less than 5 knot range I think, so the shudder phase stops pretty quickly during deceleration. Hard braking may make the shudder more intense. >> >> Based on the successful experiences reported by Tim Olson and others, I bought the Marc Parnes DU42 wheel balancer (http://www.marcparnes.com/Ducati_Motorcycle_Wheel_Balancer.htm#DU42), and used that to balance all my wheels. The DU42 is very nice piece of equipment -- surprisingly sensitive. >> >> http://www.marcparnes.com/Ducati_Motorcycle_Wheel_Balancer.htm#DU42 >> https://dl.dropbox.com/u/93114308/ParnesOnStands.JPG >> >> It took a significant amount of weight to balance the wheels (several 1/4oz weights on each wheel). From what I've read, others have had this same experience. >> https://dl.dropbox.com/u/93114308/TireWts.JPG >> >> I also installed the planearound.com Wheel Fairing Bracket Spacers to stiffen up the wheel fairing attachment to the main gear. The planearound product is well made, fit fine, and really does stiffen up the wheel fairing bracket attachment. >> https://dl.dropbox.com/u/93114308/PlaneAround1.JPG >> https://dl.dropbox.com/u/93114308/PlaneAroundInstalled.JPG >> >> Results: No discernible change in landing roll out behavior. I still get about the same shudder on roll out. Perhaps the onset speed has been raised a small number of knots as a result of balancing and adding the brackets, but I'm not sure about that. >> >> I'm not sure what else to try. >> >> Tim >> >> -- >> Tim Lewis -- HEF (Manassas, VA) >> RV-6A N47TD -- 1104 hrs - sold >> RV-10 N31TD -- 340 hrs >> >> >> >> >> > > ________________________________ Message 15 ____________________________________ Time: 07:22:34 PM PST US From: Don McDonald Subject: Re: RV10-List: Re: Shudder/shimmy on landing Not sure about the gear, but the wing is NOT the same. The wing is a 10 wi ng, but it is 2 feet shorter. Aileron is the same, but the flaps are short er. I would imagine that the attach point for the gear is not only enginee red different, but would not adapt to the existing 10 mount point.=0ADon Mc Donald=0A- =0A=0A________________________________=0A From: amekler =0ATo: rv10-list@matronics.com =0ASent: Monday, August 20, 2012 8:40 PM=0ASubject: RV10-List: Re: Shudder/shimmy on landing=0A =0A-- the RV-14 gear fit on the 10?=0Athe wing is the same.=0AAlan=0A=0A=0A=0A=0A Read this topic online here:=0A=0Ahttp://forums.matronics.com/viewtopic.php = ________________________________ Message 16 ____________________________________ Time: 10:10:50 PM PST US Subject: Re: RV10-List: Re: Shudder/shimmy on landing From: Steve T Does anyone have their fairings off at the moment? If you do, and you have a free minute, please measure the diameter of the ge ar leg a few inches down from the fuselage. Then go 18" down the gear leg p ast the first point you measured and measure the next diameter there please. Those are the two measurements I'll need to make a prototype. Thanks Steve P.S. Most people I have talked to believe this should be made of wood. If a nyone has a differing opinion, let me know. P.P.S. right now I still can't promise I'll make this available, but since i t's an issue affecting a lot of folks I'll definitely give it a really good l ook. I just want to make sure that whatever I make is of good quality and w ill address the problem. Take care Steve P.S. you can email the measurements to steve@aircraftspecialty.com Sent from my iPhone On Aug 20, 2012, at 15:31, "Roger Standley" wrote: > OK, lets summarize what people have said. There seem to be multiple "trigg ers" to cause the shudder/shimmy effect on landing. It could be mains and/or nose wheel: light toe in/out, brake disk "off", wheel pants "off", tires "o ff"...you can take your pick. The point is that the tapered main gear is too sensitive to a variety of "triggers". Lets make the tapered main gear less susceptible by changing the dynamic. > > Steve T at steve@aircraftspecialty.com has offered to make up stiffeners b ut needs to know would aluminum or wood work better? How long of a piece ar e we talking about? > > I, for one, would like to give this a shot. > > Roger "mine shudders, too" Standley > > > > > ----- Original Message ----- > From: rv10flyer > To: rv10-list@matronics.com > Sent: Monday, August 20, 2012 7:26 AM > Subject: RV10-List: Re: Shudder/shimmy on landing > > > I like to fly early. I taxied 90* to the morning sun and my nose wheel/pan t started the fore-aft oscillation at 15-18 kts GS during phase 1. Since, I have flown with the family near gross wt and have very little shudder/sh immy. I flew up to a pancake breakfast with my 90 lb son/copilot Sat. I coul d feel an up and down motion from main gear. Hmmm...that's interesting. I kn ow my Van's supplied tires are 5/16" out of round(no reason to balance an ou t of round tire), but never noticed it during first 25 hrs of testing. All I could think of was maybe I was riding more on the corners of the tires at l ow fuel/people loading and feeling scalloped tires. I have an entire set of D esser retreads/tubes to install at annual in November. > Van's first flight test in the -10 noted a shimmy. They said it was a brak e disc .002" off...they knew about this since day one. > I believe we will always have problems with our round flexible, twistable g ear legs, especially flying lightweight(which Sat was the first time in 50 h rs). So fly at gross and see if it makes a difference with yours. Note: I ha ve reinforced/improved wheel pant mounting, matco nose wheel and orig unbala nced/out of round/crappy tires/tubes. At least they don't leak down! > > -------- > Wayne Gillispie, A&P 05/93 PP 10/08 > 40983SB 12/1/2009-12/1/2011 > N715WD 382nd Flying. TT= 74 > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=381352#381352 > > > http://www.matronicp; via the Web title=http://forums.matronics.com/ h ref="http://forums.matronics.com">http://forums.matronics.com > _p; generous bsp; title=http://www.matronics. com/contribution href="http://www.matronics.com/contribution">http://www.m atronics.com/c================ > > > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ________________________________ Message 17 ____________________________________ Time: 10:19:31 PM PST US Subject: RV10-List: Gear leg stiffener update From: Steve T Hey everyone.... I'm not one to turn down a project, but I just saw that a guy on VAF is selling stiffeners for the main gear. His email is woodmanrog@comcast.net. If he's already doing this, and if his stiffeners work, I don't want to develop a product and compete with the guy who came out with it first. Check with him and if that solution doesn't seem to work for the -10, I'm happy to help out. But if it does, that might be the best option. We are working on a bunch of neat things here, which I hope to start releasing toward the end of the year. Have a lot of testing to do! Take care, Steve Www.aircraftspecialty.com Www.kitplanehoses.com Www.kitplanemods.com Sent from my iPhone ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv10-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV10-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/rv10-list Browse Digests http://www.matronics.com/digest/rv10-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.