RV-List Digest Archive

Sun 08/30/09


Total Messages Posted: 11



Today's Message Index:
----------------------
 
     1. 05:38 AM - Re: Viton o-rings (charlie heathco)
     2. 09:37 AM - Fitting The Spinner To A Hartzell (Matt Dralle)
     3. 10:26 AM - Re: Fitting The Spinner To A Hartzell (Louis Willig)
     4. 11:44 AM - Nosewheel vibration update (jhnstniii@AOL.COM)
     5. 12:43 PM - Re: Nosewheel vibration update (Jeff Orear)
     6. 02:54 PM - Re: Nosewheel vibration update (dave.gribble@mchsi.com)
     7. 03:23 PM - Re: Nosewheel vibration update (Carl Froehlich)
     8. 04:25 PM - Re: Nosewheel vibration update (jhnstniii@AOL.COM)
     9. 04:45 PM - Re: Nosewheel vibration update (Kelly McMullen)
    10. 05:09 PM - Re: Nosewheel vibration update (Carl Froehlich)
    11. 06:26 PM - Re: Nosewheel vibration update (Darrell Reiley)
 
 
 


Message 1


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    Time: 05:38:44 AM PST US
    From: "charlie heathco" <cheathco@cox.net>
    Subject: Re: Viton o-rings
    Ok, thanks a bunch for those numbers. Chalrie ----- Original Message ----- From: Tailgummer@aol.com To: rv-list@matronics.com Sent: Saturday, August 29, 2009 08:34 Subject: Re: RV-List: Viton o-rings From Randy Lervold's site: Standard MS replacement O-rings areMS28775-218; 2-218V-75 are the Viton O-rings. Try Ace Seal: http://www.aceseal.com. The High temp fluid is: . MIL-H-83282. Google Royco 782 or Aeroshell 31. John D In a message dated 8/29/2009 3:36:52 A.M. Pacific Daylight Time, cheathco@cox.net writes: I thought I had the part # someone gave me in reply to my sticking left brake problem, but as sometimes happens It seems to have gotten lost in the shuffel. This is for my RV6A. Can you repeat it pls? Im also going to strongly consider changing to the high temmp fluid. I assume a qt will do the job? Tnaks, Charlie Heathco ="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/ Navigator?RV-List ms.matronics.com/">http://forums.matronics.com tp://www.matronics.com/contribution">http://www.matronics.com/contributio n


    Message 2


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    Time: 09:37:02 AM PST US
    From: Matt Dralle <dralle@matronics.com>
    Subject: Fitting The Spinner To A Hartzell
    Listers, Hartzell recommends a minimum .1" clearance around the prop blade for the spinner. I did that exactly, but the prop would still bang on the spinner at full pitch. I had to hog out to .25" to keep the clearance at .1" at full pitch. It looked stupid having such a large gap in one area only so I evened it up to .25" all the way around. But now it kind of looks like I made the holes too big. I just can't recall seeing other installations to know if my .25" is "too much". Anyone have any pics or thoughts on the clearance using late-model Van's CS spinner and a Hartzell, particularly the 72" paddle blades I've got? Thanks! Matt Dralle RV-8 #82880 N998RV http://www.mykitlog.com/dralle


    Message 3


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    Time: 10:26:12 AM PST US
    From: Louis Willig <larywil@comcast.net>
    Subject: Re: Fitting The Spinner To A Hartzell
    At 12:35 PM 8/30/2009, you wrote: > > ><<Listers, > >Hartzell recommends a minimum .1" clearance around the prop blade >for the spinner. I did that exactly, but the prop would still bang >on the spinner at full pitch. I had to hog out to .25" to keep the >clearance at .1" at full pitch. It looked stupid having such a >large gap in one area only so I evened it up to .25" all the way >around. But now it kind of looks like I made the holes too big. I >just can't recall seeing other installations to know if my .25" is >"too much". Anyone have any pics or thoughts on the clearance using >late-model Van's CS spinner and a Hartzell, particularly the 72" >paddle blades I've got?>> Hi Matt, Look, its a constant speed prop. It will never look like the close fitted spinner of your old fixed pitch. Unless you plan to enter a CAFE race or try out at Reno, leave the .25" gap. This, of course is my opinion, but, my -4 has a similar gap and I think nothing of it. Louis I Willig 1640 Oakwood Dr. Penn Valley, PA 19072 610 668-4964 RV-4, N180PF 190HP IO-360, C/S prop


    Message 4


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    Time: 11:44:41 AM PST US
    Subject: Nosewheel vibration update
    From: jhnstniii@AOL.COM
    Listers--Promised I would report on our efforts to stop the vertical vibration of our nosewheel/pant assembly. We started with the tire. We bought a motorcycle wheel balancer (simple rod rolling on ball bearing supports type) and immediately noticed the tire was quite out of round and out of balance.?We thought "problem solved" and bought a new tire.?This one was round.?We added weights until it was balanced, and?during taxi testing were surprised to find there was no improvement.? We then tried different combinations of tire pressure and bearing torque (within the required limits).?The best was with very low tire pressure and medium torque, but we still had the problem at?20 mph or more.? So?then we glassed?a piece of wood (with four layers of medium weight glass) on to the leg from the bend at the bottom up to where it enters the cowling, hoping to change the vibration characteristics.?No improvement!? I wonder if a little lead in the nose or tail of the pant might help (th e pant is balanced fore and aft right now so doing this would actually?unbalance it). We are running out of ideas. One of our hangar buddies was up at OSH watching the RVs taxi by for takeoff and he said many of them had vibrating nosewheels. We have the new type nosewheel fork. Don't know if there is a vibrational difference between this type and the old type. Any ideas? Thanks. LeRoy Johnston and David White RV-6A N176LD Esperanza 200+ hours flying.????????????????


    Message 5


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    Time: 12:43:03 PM PST US
    From: Jeff Orear <jorear@new.rr.com>
    Subject: Re: Nosewheel vibration update
    This may seem rather rudimentary, but are you sure it is your nosewheel that is shimmying? I thought I had a nosewheel shake as well until a local pilot saw me land while waiting at the hold short line and reported that my left main was the culprit. I suspect uneven tire wear, but balancing out the wheel/tire resulted in some improvement. I plan to replace the main tires/tubes at next conditional inspection. Just a thought. Regards, Jeff Orear RV6A N782P Peshtigo, WI On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com wrote: > Listers--Promised I would report on our efforts to stop the vertical > vibration of our nosewheel/pant assembly. We started with the tire. > We bought a motorcycle wheel balancer (simple rod rolling on ball > bearing supports type) and immediately noticed the tire was quite > out of round and out of balance. We thought "problem solved" and > bought a new tire. This one was round. We added weights until it was > balanced, and during taxi testing were surprised to find there was > no improvement. We then tried different combinations of tire > pressure and bearing torque (within the required limits). The best > was with very low tire pressure and medium torque, but we still had > the problem at 20 mph or more. So then we glassed a piece of wood > (with four layers of medium weight glass) on to the leg from the > bend at the bottom up to where it enters the cowling, hoping to > change the vibration characteristics. No improvement! I wonde r if > a little lead in the nose or tail of the pant might help (the pant > is balanced fore and aft right now so doing this would actually > unbalance it). We are running out of ideas. One of our hangar > buddies was up at OSH watching the RVs taxi by for takeoff and he > said many of them had vibrating nosewheels. We have the new type > nosewheel fork. Don't know if there is a vibrational difference > between this type and the old type. Any ideas? Thanks. LeRoy > Johnston and David White RV-6A N176LD Esperanza 200+ hours flying. > >


    Message 6


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    Time: 02:54:38 PM PST US
    From: dave.gribble@mchsi.com
    Subject: Re: Nosewheel vibration update
    Some people have installed a $40 Matco axle that reduces rolling friction... and some people have changed to a $300 Grove nosewheel with conventional felt seals (instead of rubber seals) to reduce rolling friction. What setup are you running? -------------- Original message ---------------------- From: jhnstniii@aol.com > > Listers--Promised I would report on our efforts to stop the vertical vibration > of our nosewheel/pant assembly. We started with the tire. We bought a motorcycle > wheel balancer (simple rod rolling on ball bearing supports type) and > immediately noticed the tire was quite out of round and out of balance.?We > thought "problem solved" and bought a new tire.?This one was round.?We added > weights until it was balanced, and?during taxi testing were surprised to find > there was no improvement.? We then tried different combinations of tire pressure > and bearing torque (within the required limits).?The best was with very low tire > pressure and medium torque, but we still had the problem at?20 mph or more.? > So?then we glassed?a piece of wood (with four layers of medium weight glass) on > to the leg from the bend at the bottom up to where it enters the cowling, hoping > to change the vibration characteristics.?No improvement!? I wonder if a little > lead in the nose or tail of the pant might help (th > e pant is balanced fore and aft right now so doing this would > actually?unbalance it). We are running out of ideas. One of our hangar buddies > was up at OSH watching the RVs taxi by for takeoff and he said many of them had > vibrating nosewheels. We have the new type nosewheel fork. Don't know if there > is a vibrational difference between this type and the old type. Any ideas? > Thanks. LeRoy Johnston and David White RV-6A N176LD Esperanza 200+ hours > flying.????????????????


    Message 7


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    Time: 03:23:27 PM PST US
    From: "Carl Froehlich" <carl.froehlich@verizon.net>
    Subject: Nosewheel vibration update
    Two things to try: 1. Install the MATCO nose wheel axle. Here is the link: http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html This allows for the axle bolt to be fully tighten without too much pre-load on the bearings. This help my 8A nose gear problem. 2. Do the same balance on the main gear that you did on the nose gear. I noted a significant improvement on the nose gear shimmy after I replace my main gear. Carl Froehlich RV-8A (525 hrs) RV-10 (fuselage) From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Jeff Orear Sent: Sunday, August 30, 2009 3:31 PM Subject: Re: RV-List: Nosewheel vibration update This may seem rather rudimentary, but are you sure it is your nosewheel that is shimmying? I thought I had a nosewheel shake as well until a local pilot saw me land while waiting at the hold short line and reported that my left main was the culprit. I suspect uneven tire wear, but balancing out the wheel/tire resulted in some improvement. I plan to replace the main tires/tubes at next conditional inspection. Just a thought. Regards, Jeff Orear RV6A N782P Peshtigo, WI On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com wrote: Listers--Promised I would report on our efforts to stop the vertical vibration of our nosewheel/pant assembly. We started with the tire. We bought a motorcycle wheel balancer (simple rod rolling on ball bearing supports type) and immediately noticed the tire was quite out of round and out of balance. We thought "problem solved" and bought a new tire. This one was round. We added weights until it was balanced, and during taxi testing were surprised to find there was no improvement. We then tried different combinations of tire pressure and bearing torque (within the required limits). The best was with very low tire pressure and medium torque, but we still had the problem at 20 mph or more. So then we glassed a piece of wood (with four layers of medium weight glass) on to the leg from the bend at the bottom up to where it enters the cowling, hoping to change the vibration characteristics. No improvement! I wonde r if a little lead in the nose or tail of the pant might help (the pant is balanced fore and aft right now so doing this would actually unbalance it). We are running out of ideas. One of our hangar buddies was up at OSH watching the RVs taxi by for takeoff and he said many of them had vibrating nosewheels. We have the new type nosewheel fork. Don't know if there is a vibrational difference between this type and the old type. Any ideas? Thanks. LeRoy Johnston and David White RV-6A N176LD Esperanza 200+ hours flying. href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/N avigator?RV-List href="http://forums.matronics.com">http://forums.matronics.com href="http://www.matronics.com/contribution">http://www.matronics.com/contri bution


    Message 8


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    Time: 04:25:00 PM PST US
    Subject: Re: Nosewheel vibration update
    From: jhnstniii@AOL.COM
    We balanced the mains and they are round--no improvement. They don't vibrate.? It is very obviously the nose wheel because we've taxied by with one of us as observer at various speeds and with the stick in various positions.? The pant/wheel assembly is going up and down and you can feel it in the cockpit. We have the bearing with the rubber seals that has to be torqued to spec. Will check out the MATCO axle. Thanks.???? -----Original Message----- From: Carl Froehlich <carl.froehlich@verizon.net> Sent: Sun, Aug 30, 2009 6:20 pm Subject: RE: RV-List: Nosewheel vibration update Two things to try: 1.????? Install the MATCO nose wheel axle.? Here is the link: http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html? This allows for the axle bolt to be fully tighten without too much pre-load on the bearings.? This help my 8A nose gear problem. 2.????? Do the same balance on the main gear that you did on the nose gear.? I noted a significant improvement on the nose gear shimmy after I replace my main gear. ? Carl Froehlich RV-8A (525 hrs) RV-10 (fuselage) ? ? From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Jeff Orear Sent: Sunday, August 30, 2009 3:31 PM Subject: Re: RV-List: Nosewheel vibration update ? This may seem rather rudimentary, but are you sure it is your nosewheel that is shimmying? ?I thought I had a nosewheel shake as well until a local pilot saw me land while waiting at the hold short line and reported that my left main was the culprit. ?I suspect uneven tire wear, but balancing out the wheel/tire resulted in some improvement. ?I plan to replace the main tires/tubes at next conditional inspection. ? Just a thought. ? ? ? Regards, ? Jeff Orear RV6A ?N782P Peshtigo, WI ? ? On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com wrote: Listers--Promised I would report on our efforts to stop the vertical vibration of our nosewheel/pant assembly. We started with the tire. We bought a motorcycle wheel balancer (simple rod rolling on ball bearing supports type) and immediately noticed the tire was quite out of round and out of balance.?We thought "problem solved" and bought a new tire.?This one was round.?We added weights until it was balanced, and?during taxi testing were surprised to find there was no improvement.? We then tried different combinations of tire pressure and bearing torque (within the required limits).?The best was with very low tire pressure and medium torque, but we still had the problem at?20 mph or more.? So?then we glassed?a piece of wood (with four layers of medium weight glass) on to the leg from the bend at the bottom up to where it enters the cowling, hoping to change the vibration characteristics.?No improvement!? I wonde r if a little lead in the nose or tail of the pant might help (t he pant is balanced fore and aft right now so doing this would actually?unbalance it). We are running out of ideas. One of our hangar buddies was up at OSH watching the RVs taxi by for takeoff and he said many of them had vibrating nosewheels. We have the new type nosewheel fork. Don't know if there is a vibrational difference between this type and the old type. Any ideas? Thanks. LeRoy Johnston and David White RV-6A N176LD Esperanza 200+ hours flying.???????????????? ? href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List href="http://forums.matronics.com">http://forums.matronics.com href="http://www.matronics.com/contribution">http://www.matronics.com/contribution ? ? ? ? http://www.matronics.com/Navigator?RV-List http://forums.matronics.com http://www.matronics.com/contribution ?


    Message 9


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    Time: 04:45:12 PM PST US
    From: Kelly McMullen <kellym@aviating.com>
    Subject: Re: Nosewheel vibration update
    Also balance the wheel pant. Lead shot can be glassed in to accomplish this, so the wheel pant is balanced about the axle. jhnstniii@aol.com wrote: > We balanced the mains and they are round--no improvement. They don't > vibrate. It is very obviously the nose wheel because we've taxied by > with one of us as observer at various speeds and with the stick in > various positions. The pant/wheel assembly is going up and down and you > can feel it in the cockpit. We have the bearing with the rubber seals > that has to be torqued to spec. Will check out the MATCO axle. Thanks. > > > -----Original Message----- > From: Carl Froehlich <carl.froehlich@verizon.net> > To: rv-list@matronics.com > Sent: Sun, Aug 30, 2009 6:20 pm > Subject: RE: RV-List: Nosewheel vibration update > > Two things to try: > 1. Install the MATCO nose wheel axle. Here is the link: > http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html This > allows for the axle bolt to be fully tighten without too much pre-load > on the bearings. This help my 8A nose gear problem. > 2. Do the same balance on the main gear that you did on the nose > gear. I noted a significant improvement on the nose gear shimmy after I > replace my main gear. > > Carl Froehlich > RV-8A (525 hrs) > RV-10 (fuselage) > > > *From:* owner-rv-list-server@matronics.com > <mailto:owner-rv-list-server@matronics.com> > [mailto:owner-rv-list-server@matronics.com > <mailto:owner-rv-list-server@matronics.com?>] *On Behalf Of *Jeff Orear > *Sent:* Sunday, August 30, 2009 3:31 PM > *To:* rv-list@matronics.com <mailto:rv-list@matronics.com> > *Subject:* Re: RV-List: Nosewheel vibration update > > This may seem rather rudimentary, but are you sure it is your nosewheel > that is shimmying? I thought I had a nosewheel shake as well until a > local pilot saw me land while waiting at the hold short line and > reported that my left main was the culprit. I suspect uneven tire wear, > but balancing out the wheel/tire resulted in some improvement. I plan > to replace the main tires/tubes at next conditional inspection. > > Just a thought. > > > Regards, > > Jeff Orear > RV6A N782P > Peshtigo, WI > > > On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com > <mailto:jhnstniii@aol.com> wrote: > > > Listers--Promised I would report on our efforts to stop the vertical > vibration of our nosewheel/pant assembly. We started with the tire. We > bought a motorcycle wheel balancer (simple rod rolling on ball bearing > supports type) and immediately noticed the tire was quite out of round > and out of balance. We thought "problem solved" and bought a new > tire. This one was round. We added weights until it was balanced, > and during taxi testing were surprised to find there was no > improvement. We then tried different combinations of tire pressure and > bearing torque (within the required limits). The best was with very low > tire pressure and medium torque, but we still had the problem at 20 mph > or more. So then we glassed a piece of wood (with four layers of medium > weight glass) on to the leg from the bend at the bottom up to where it > enters the cowling, hoping to change the vibration characteristics. No > improvemen t! I wonde r if a little lead in the nose or tail of the > pant might help (the pant is balanced fore and aft right now so doing > this would actually unbalance it). We are running out of ideas. One of > our hangar buddies was up at OSH watching the RVs taxi by for takeoff > and he said many of them had vibrating nosewheels. We have the new type > nosewheel fork. Don't know if there is a vibrational difference between > this type and the old type. Any ideas? Thanks. LeRoy Johnston and David > White RV-6A N176LD Esperanza 200+ hours flying. > > * * > > *href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List <http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List>* > > *href="http://forums.matronics.com">http://forums.matronics.com <http://forums.matronics.com">http://forums.matronics.com>* > > *href="http://www.matronics.com/contribution">http://www.matronics.com/contribution <http://www.matronics.com/contribution">http://www.matronics.com/contribution>* > > * * > > > > * * > > * * > > ** > > ** > > ** > > ** > > ** > > ** > > *http://www.matronics.com/Navigator?RV-List* > > ** > > ** > > ** > > *http://forums.matronics.com <http://forums.matronics.com/>* > > ** > > ** > > ** > > ** > > *http://www.matronics.com/contribution* > > ** > > * * > > * > > > * > > * > > > *


    Message 10


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    Time: 05:09:56 PM PST US
    From: "Carl Froehlich" <carl.froehlich@verizon.net>
    Subject: Nosewheel vibration update
    Ok. When you get the MATCO axle, set it up so the wheel spins easily - just tight enough so there is no bearing slop. Carl From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of jhnstniii@aol.com Sent: Sunday, August 30, 2009 7:24 PM Subject: Re: RV-List: Nosewheel vibration update We balanced the mains and they are round--no improvement. They don't vibrate. It is very obviously the nose wheel because we've taxied by with one of us as observer at various speeds and with the stick in various positions. The pant/wheel assembly is going up and down and you can feel it in the cockpit. We have the bearing with the rubber seals that has to be torqued to spec. Will check out the MATCO axle. Thanks. -----Original Message----- From: Carl Froehlich <carl.froehlich@verizon.net> Sent: Sun, Aug 30, 2009 6:20 pm Subject: RE: RV-List: Nosewheel vibration update Two things to try: 1. Install the MATCO nose wheel axle. Here is the link: <http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html> http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html This allows for the axle bolt to be fully tighten without too much pre-load on the bearings. This help my 8A nose gear problem. 2. Do the same balance on the main gear that you did on the nose gear. I noted a significant improvement on the nose gear shimmy after I replace my main gear. Carl Froehlich RV-8A (525 hrs) RV-10 (fuselage) From: <mailto:owner-rv-list-server@matronics.com> owner-rv-list-server@matronics.com [ <mailto:owner-rv-list-server@matronics.com?> mailto:owner-rv-list-server@matronics.com] On Behalf Of Jeff Orear Sent: Sunday, August 30, 2009 3:31 PM Subject: Re: RV-List: Nosewheel vibration update This may seem rather rudimentary, but are you sure it is your nosewheel that is shimmying? I thought I had a nosewheel shake as well until a local pilot saw me land while waiting at the hold short line and reported that my left main was the culprit. I suspect uneven tire wear, but balancing out the wheel/tire resulted in some improvement. I plan to replace the main tires/tubes at next conditional inspection. Just a thought. Regards, Jeff Orear RV6A N782P Peshtigo, WI On Aug 30, 2009, at 1:21 PM, <mailto:jhnstniii@aol.com> jhnstniii@aol.com wrote: Listers--Promised I would report on our efforts to stop the vertical vibration of our nosewheel/pant assembly. We started with the tire. We bought a motorcycle wheel balancer (simple rod rolling on ball bearing supports type) and immediately noticed the tire was quite out of round and out of balance. We thought "problem solved" and bought a new tire. This one was round. We added weights until it was balanced, and during taxi testing were surprised to find there was no improvement. We then tried different combinations of tire pressure and bearing torque (within the required limits). The best was with very low tire pressure and medium torque, but we still had the problem at 20 mph or more. So then we glassed a piece of wood (with four layers of medium weight glass) on to the leg from the bend at the bottom up to where it enters the cowling, hoping to change the vibration characteristics. No improvemen t! I wonde r if a little lead in the nose or tail of the pant might help (the pant is balanced fore and aft right now so doing this would actually unbalance it). We are running out of ideas. One of our hangar buddies was up at OSH watching the RVs taxi by for takeoff and he said many of them had vibrating nosewheels. We have the new type nosewheel fork. Don't know if there is a vibrational difference between this type and the old type. Any ideas? Thanks. LeRoy Johnston and David White RV-6A N176LD Esperanza 200+ hours flying. href=" <http://www.matronics.com/Navigator?RV-List> http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigat or?RV-List href=" <http://forums.matronics.com> http://forums.matronics.com">http://forums.matronics.com href=" <http://www.matronics.com/contribution> http://www.matronics.com/contribution">http://www.matronics.com/contribution <http://www.matronics.com/Navigator?RV-List> http://www.matronics.com/Navigator?RV-List <http://forums.matronics.com/> http://forums.matronics.com <http://www.matronics.com/contribution> http://www.matronics.com/contribution http://www.matronics.com/Navigator?RV-List http://www.matronics.com/contribution


    Message 11


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    Time: 06:26:22 PM PST US
    From: Darrell Reiley <lifeofreiley2003@yahoo.com>
    Subject: Re: Nosewheel vibration update
    OMG... I've heard it all now :-) --- On Sun, 8/30/09, Kelly McMullen <kellym@aviating.com> wrote: > From: Kelly McMullen <kellym@aviating.com> > Subject: Re: RV-List: Nosewheel vibration update > To: rv-list@matronics.com > Date: Sunday, August 30, 2009, 6:43 PM > Kelly McMullen <kellym@aviating.com> > > Also balance the wheel pant. Lead shot can be glassed in to > accomplish this, so the wheel pant is balanced about the > axle. > > jhnstniii@aol.com > wrote: > > We balanced the mains and they are round--no > improvement. They don't vibrate. It is very obviously > the nose wheel because we've taxied by with one of us as > observer at various speeds and with the stick in various > positions. The pant/wheel assembly is going up and > down and you can feel it in the cockpit. We have the bearing > with the rubber seals that has to be torqued to spec. Will > check out the MATCO axle. Thanks. > > > > -----Original Message----- > > From: Carl Froehlich <carl.froehlich@verizon.net> > > To: rv-list@matronics.com > > Sent: Sun, Aug 30, 2009 6:20 pm > > Subject: RE: RV-List: Nosewheel vibration update > > > > Two things to try: > > 1. Install the MATCO nose wheel > axle. Here is the link: http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html > This allows for the axle bolt to be fully tighten without > too much pre-load on the bearings. This help my 8A > nose gear problem. > > 2. Do the same balance on the main > gear that you did on the nose gear. I noted a > significant improvement on the nose gear shimmy after I > replace my main gear. > > Carl Froehlich > > RV-8A (525 hrs) > > RV-10 (fuselage) > >*From:* owner-rv-list-server@matronics.com > <mailto:owner-rv-list-server@matronics.com> > [mailto:owner-rv-list-server@matronics.com > <mailto:owner-rv-list-server@matronics.com?>] > *On Behalf Of *Jeff Orear > > *Sent:* Sunday, August 30, 2009 3:31 PM > > *To:* rv-list@matronics.com > <mailto:rv-list@matronics.com> > > *Subject:* Re: RV-List: Nosewheel vibration update > > This may seem rather rudimentary, but are you > sure it is your nosewheel that is shimmying? I thought > I had a nosewheel shake as well until a local pilot saw me > land while waiting at the hold short line and reported that > my left main was the culprit. I suspect uneven tire > wear, but balancing out the wheel/tire resulted in some > improvement. I plan to replace the main tires/tubes at > next conditional inspection. > > Just a thought. Regards, > > Jeff Orear > > RV6A N782P > > Peshtigo, WI > >On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com > <mailto:jhnstniii@aol.com> > wrote: > > > > > > Listers--Promised I would report on our efforts to > stop the vertical vibration of our nosewheel/pant assembly. > We started with the tire. We bought a motorcycle wheel > balancer (simple rod rolling on ball bearing supports type) > and immediately noticed the tire was quite out of round and > out of balance. We thought "problem solved" and bought a new > tire. This one was round. We added weights until it was > balanced, and during taxi testing were surprised to find > there was no improvement. We then tried different > combinations of tire pressure and bearing torque (within the > required limits). The best was with very low tire pressure > and medium torque, but we still had the problem at 20 mph or > more. So then we glassed a piece of wood (with four > layers of medium weight glass) on to the leg from the bend > at the bottom up to where it enters the cowling, hoping to > change the vibration characteristics. No improvemen t! > I wonde r if a little lead in the nose or tail of the pant > might help (the pant is balanced fore and aft right now so > doing this would actually unbalance it). We are running out > of ideas. One of our hangar buddies was up at OSH watching > the RVs taxi by for takeoff and he said many of them had > vibrating nosewheels. We have the new type nosewheel fork. > Don't know if there is a vibrational difference between this > type and the old type. Any ideas? Thanks. LeRoy Johnston and > David White RV-6A N176LD Esperanza 200+ hours flying. > > > * * > > > > *href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List <http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List>* > > > > *href="http://forums.matronics.com">http://forums.matronics.com <http://forums.matronics.com">http://forums.matronics.com>* > > > > *href="http://www.matronics.com/contribution">http://www.matronics.com/contribution <http://www.matronics.com/contribution">http://www.matronics.com/contribution>* > > > > * * > > > > > > * * > > > > * * > > > > ** > > > > ** > > > > ** > > > > ** > > > > ** > > > > ** > > > > *http://www.matronics.com/Navigator?RV-List* > > > > ** > > > > ** > > > > ** > > > > *http://forums.matronics.com <http://forums.matronics.com/>* > > > > ** > > > > ** > > > > ** > > > > ** > > > > *http://www.matronics.com/contribution* > > > > ** > > > > * * > > > > * > > > > > > * > > > > * > > > > > > * > > Forum - > FAQ, > - MATRONICS WEB FORUMS - > List Contribution Web Site - > -Matt > Dralle, List Admin. > > > >




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