Zenith601-List Digest Archive

Sun 10/25/09


Total Messages Posted: 14



Today's Message Index:
----------------------
 
     1. 02:18 AM - Re: Nose wheel fork failure (Thruster87)
     2. 02:37 AM - Re: Nose wheel fork failure (aussiech650)
     3. 08:10 AM - Re: Re: Nose wheel fork failure (LarryMcFarland)
     4. 08:43 AM - Re: Re: Nose wheel fork failure (Rick Lindstrom)
     5. 08:58 AM - Re: Re: Nose wheel fork failure (jeyoung65@aol.com)
     6. 09:02 AM - Re: Re: Nose wheel fork failure (jeyoung65@aol.com)
     7. 09:09 AM - Re: Re: Nose wheel fork failure (Bryan Martin)
     8. 09:23 AM - Re: Re: Nose wheel fork failure (Rick Lindstrom)
     9. 09:53 AM - Re: Re: Nose wheel fork failure (Paul Mulwitz)
    10. 12:58 PM - Re: [Possible Spam] Re: Re: Nose wheel fork failure (LarryMcFarland)
    11. 04:38 PM - Re: Nose wheel fork failure (Ron Lendon)
    12. 05:05 PM - First Flight (Afterfxllc@aol.com)
    13. 05:20 PM - Re: Re: Nose wheel fork failure (KARL POLIFKA)
    14. 05:38 PM - Re: Nose wheel fork failure (Thruster87)
 
 
 


Message 1


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    Time: 02:18:59 AM PST US
    Subject: Re: Nose wheel fork failure
    From: "Thruster87" <alania@optusnet.com.au>
    craig(at)craigandjean.com wrote: > On the photo of the front gear is that extra stepped rod resting in the V > block (below the main cross tube that links to the rudder pedals) your own > addition or something from the factory? I'm guessing you had to add it when > the cross tube on the factory part didn't reach the V because to the stop > plate on the top of the gear. I think I can also see an extra shim fitted > into the V of the black nylon part. > > -- Craig > > -- It was a mod I did to allow the nose wheel to move more freely.It has a stainless steel rod with phosphor bronze bushes resting on a crom-moly plate bolted thru the bearing material for the V.It really made the rudder pedals free up and smooth to operate.As you can see it stayed intact even thro the nose leg tube bent. Cheers Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269310#269310


    Message 2


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    Time: 02:37:00 AM PST US
    Subject: Re: Nose wheel fork failure
    From: "aussiech650" <greg@gas-n-go.com.au>
    Alan, I have an XL601 nose leg that I will not be using. Give me a call if you would like it. Greg 0415610593. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269313#269313


    Message 3


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    Time: 08:10:08 AM PST US
    From: LarryMcFarland <larry@macsmachine.com>
    Subject: Re: Nose wheel fork failure
    Ron, That fork has a logical reason for failing and I'm sure it'll reveal itself eventually. The steerable linked nose gear is more asset than liability. To be able to steer around potholes and rough fields is a major improvement over differential braking. I've experienced both types. For the tail dragger, it's logical, but for tri-gear it would be detrimental to add a free-caster nose-wheel to side braking mains. I know it's done in some aircraft, but it's a much lesser solution to the steerable nose wheel. Curious how the nose wheel steering got sideways far enough to fail the fork. Or it would seem there was not enough attention to where the nose wheel was at the time. Larry McFarland 601HDS at www.macsmachine.com Ron Lendon wrote: > > Sorry to hear about that. > > I have been considering spring loading the front wheel so it can track separately from the rudder. The front wheel really does need a good caster angle for this to work, but I have been thinking about it. > > -------- > Ron Lendon, Clinton Township, MI > WW Corvair with Roy's Garage 5th bearing > Zodiac XL, ScrapBuilder ;-) > http://www.mykitlog.com/rlendon > Corvair Engine Prints: > http://home.comcast.net/~rlendon/site/ > > >


    Message 4


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    Time: 08:43:10 AM PST US
    From: Rick Lindstrom <tigerrick@mindspring.com>
    Subject: Re: Nose wheel fork failure
    Not to pick a fight here, Larry, but after flying close to 5000 hours in Grumman American airplanes with free castering nose gear, I have to object to your post. Besides the obvious simplicity and ease of maintenance of the free castering design, its 180 degree pivot allows for incredibly tight turns while parking or simple maneuvering around objects. Assuming the airplane doesn't have a draggy brake on one side or the other, taxiing is a breeze with an occasional tap on the brake to maintain directional control. The only negative I can see is replacing brake pads slightly more often, but pads are cheap and there's no linkage, springs, holes in the firewall, or any of the other hoopla associated with a steerable nosewheel. And best of all, the nose wheel alignment to the runway self corrects automatically upon landing, so any worry about side loads is moot. Your claim that it's "a much lesser solution" needs some qualification. I'm curious, in what way? Best, Rick Lindstrom ZenVair N42KP -----Original Message----- >From: LarryMcFarland <larry@macsmachine.com> >Sent: Oct 25, 2009 8:07 AM >To: zenith601-list@matronics.com >Subject: Re: Zenith601-List: Re: Nose wheel fork failure > > >Ron, >That fork has a logical reason for failing and I'm sure it'll reveal >itself eventually. >The steerable linked nose gear is more asset than liability. To be able >to steer around potholes and rough fields is >a major improvement over differential braking. I've experienced both >types. For the tail dragger, it's logical, but for tri-gear >it would be detrimental to add a free-caster nose-wheel to side braking >mains. I know it's done in some aircraft, but >it's a much lesser solution to the steerable nose wheel. >Curious how the nose wheel steering got sideways far enough to fail the >fork. Or it would seem >there was not enough attention to where the nose wheel was at the time. > >Larry McFarland 601HDS at www.macsmachine.com


    Message 5


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    Time: 08:58:29 AM PST US
    Subject: Re: Nose wheel fork failure
    From: jeyoung65@aol.com
    Could it be possible that the "free-caster nose wheel" is the problem? I do not understand how this was accomplish!!!!Landing in with a crosswind would indicate the nose wheel as cocked so when the nose wheel came down a side load was appllied to it. Now with a caster nose wheel, the nose wh eel would be forced to turn to it's limit. Thus the fork could bend. My $0 .02 Jerry of GA -----Original Message----- From: LarryMcFarland <larry@macsmachine.com> Sent: Sun, Oct 25, 2009 10:07 am Subject: Re: Zenith601-List: Re: Nose wheel fork failure m> Ron, That fork has a logical reason for failing and I'm sure it'll reveal itsel f eventually. The steerable linked nose gear is more asset than liability. To be able to steer around potholes and rough fields is a major improvement over differential braking. I've experienced both types . For the tail dragger, it's logical, but for tri-gear it would be detrimental to add a free-caster nose-wheel to side braking ma ins. I know it's done in some aircraft, but it's a much lesser solution to the steerable nose wheel. Curious how the nose wheel steering got sideways far enough to fail the fo rk. Or it would seem there was not enough attention to where the nose wheel was at the time. Larry McFarland 601HDS at www.macsmachine.com


    Message 6


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    Time: 09:02:16 AM PST US
    Subject: Re: Nose wheel fork failure
    From: jeyoung65@aol.com
    Rick, you are talking about a gear that is design to have a castering gear . The 601 nose gear was not designned for a castering nose wheel. On a cas tering nose wheel the strut is in front of the wheel center so the wheel is drag down the runway not pushed. Jerry of GA -----Original Message----- From: Rick Lindstrom <tigerrick@mindspring.com> Sent: Sun, Oct 25, 2009 10:42 am Subject: Re: Zenith601-List: Re: Nose wheel fork failure .com> Not to pick a fight here, Larry, but after flying close to 5000 hours in Grumman merican airplanes with free castering nose gear, I have to object to your post. Besides the obvious simplicity and ease of maintenance of the free casteri ng esign, its 180 degree pivot allows for incredibly tight turns while parkin g or imple maneuvering around objects. Assuming the airplane doesn't have a dra ggy rake on one side or the other, taxiing is a breeze with an occasional tap on he brake to maintain directional control. The only negative I can see is replacing brake pads slightly more often, but ads are cheap and there's no linkage, springs, holes in the firewall, or any of he other hoopla associated with a steerable nosewheel. And best of all, th e ose wheel alignment to the runway self corrects automatically upon landing , so ny worry about side loads is moot. Your claim that it's "a much lesser solution" needs some qualification. I' m urious, in what way? Best, Rick Lindstrom enVair N42KP -----Original Message----- From: LarryMcFarland <larry@macsmachine.com> Sent: Oct 25, 2009 8:07 AM Subject: Re: Zenith601-List: Re: Nose wheel fork failure m> Ron, That fork has a logical reason for failing and I'm sure it'll reveal itself eventually. The steerable linked nose gear is more asset than liability. To be able to steer around potholes and rough fields is a major improvement over differential braking. I've experienced both types. For the tail dragger, it's logical, but for tri-gear it would be detrimental to add a free-caster nose-wheel to side braking mains. I know it's done in some aircraft, but it's a much lesser solution to the steerable nose wheel. Curious how the nose wheel steering got sideways far enough to fail the fork. Or it would seem there was not enough attention to where the nose wheel was at the time. Larry McFarland 601HDS at www.macsmachine.com -======================== ======================== =========== -= - The Zenith601-List Email Forum - -= Use the Matronics List Features Navigator to browse -= the many List utilities such as List Un/Subscription, -= Archive Search & Download, 7-Day Browse, Chat, FAQ, -= Photoshare, and much much more: - -= --> http://www.matronics.com/Navigator?Zenith601-List - -======================== ======================== =========== -= - MATRONICS WEB FORUMS - -= Same great content also available via the Web Forums! - -= --> http://forums.matronics.com - -======================== ======================== =========== -= - List Contribution Web Site - -= Thank you for your generous support! -= -Matt Dralle, List Admin. -= --> http://www.matronics.com/contribution -======================== ======================== ===========


    Message 7


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    Time: 09:09:15 AM PST US
    From: Bryan Martin <bryanmmartin@comcast.net>
    Subject: Re: Nose wheel fork failure
    I don't think you should try to strengthen the fork any more than it is. If you make it too strong, in a hard landing it would shift the first point of failure to some other component. From the looks of those photos, the nose gear must have come down very hard and it wouldn't have helped much if the fork had stayed intact. That fork absorbed a lot of energy before it failed. It won't do much good to make the fork indestructible if it causes the strut to shear off and you plant the nose on the runway at 40 mph. At 50 mph and full throttle, that elevator has a whole lot of authority, you have to use a light hand on it. At full throttle, once that nosewheel comes off, that airplane wants to get airborne in a hurry. Be ready to chop the throttle and let it settle in. -- Bryan Martin CH 601 XL Builder No: 64003


    Message 8


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    Time: 09:23:29 AM PST US
    From: Rick Lindstrom <tigerrick@mindspring.com>
    Subject: Re: Nose wheel fork failure
    Yes, I know, Jerry. My 601XL has a steerable nosewheel, just as designed. I was just responding to Larry's assertion that free-castering nosewheels are inferior in some way. The ONLY way you can impart a side load to the nose fork on the 601 is to land with it cocked significantly to one side. This means either full rudder deflection or something not right in the initial rigging. But it's just speculation at this point, until the facts are in. Rick -----Original Message----- >From: jeyoung65@aol.com >Sent: Oct 25, 2009 9:01 AM >To: zenith601-list@matronics.com >Subject: Re: Zenith601-List: Re: Nose wheel fork failure > >Rick, you are talking about a gear that is design to have a castering gear. The 601 nose gear was not designned for a castering nose wheel. On a castering nose wheel the strut is in front of the wheel center so the wheel is drag down the runway not pushed. Jerry of GA > > >-----Original Message----- >From: Rick Lindstrom <tigerrick@mindspring.com> >To: zenith601-list@matronics.com >Sent: Sun, Oct 25, 2009 10:42 am >Subject: Re: Zenith601-List: Re: Nose wheel fork failure > > >Not to pick a fight here, Larry, but after flying close to 5000 hours in Grumman >merican airplanes with free castering nose gear, I have to object to your post. >Besides the obvious simplicity and ease of maintenance of the free castering >esign, its 180 degree pivot allows for incredibly tight turns while parking or >imple maneuvering around objects. Assuming the airplane doesn't have a draggy >rake on one side or the other, taxiing is a breeze with an occasional tap on >he brake to maintain directional control. >The only negative I can see is replacing brake pads slightly more often, but >ads are cheap and there's no linkage, springs, holes in the firewall, or any of >he other hoopla associated with a steerable nosewheel. And best of all, the >ose wheel alignment to the runway self corrects automatically upon landing, so >ny worry about side loads is moot. >Your claim that it's "a much lesser solution" needs some qualification. I'm >urious, in what way? >Best, >Rick Lindstrom >enVair N42KP >-----Original Message----- >From: LarryMcFarland <larry@macsmachine.com> >Sent: Oct 25, 2009 8:07 AM >To: zenith601-list@matronics.com >Subject: Re: Zenith601-List: Re: Nose wheel fork failure > > >Ron, >That fork has a logical reason for failing and I'm sure it'll reveal >itself eventually. >The steerable linked nose gear is more asset than liability. To be able >to steer around potholes and rough fields is >a major improvement over differential braking. I've experienced both >types. For the tail dragger, it's logical, but for tri-gear >it would be detrimental to add a free-caster nose-wheel to side braking >mains. I know it's done in some aircraft, but >it's a much lesser solution to the steerable nose wheel. >Curious how the nose wheel steering got sideways far enough to fail the >fork. Or it would seem >there was not enough attention to where the nose wheel was at the time. > >Larry McFarland 601HDS at www.macsmachine.com > >-=========================================================== >-= - The Zenith601-List Email Forum - >-= Use the Matronics List Features Navigator to browse >-= the many List utilities such as List Un/Subscription, >-= Archive Search & Download, 7-Day Browse, Chat, FAQ, >-= Photoshare, and much much more: >- >-= --> http://www.matronics.com/Navigator?Zenith601-List >- >-=========================================================== >-= - MATRONICS WEB FORUMS - >-= Same great content also available via the Web Forums! >- >-= --> http://forums.matronics.com >- >-=========================================================== >-= - List Contribution Web Site - >-= Thank you for your generous support! >-= -Matt Dralle, List Admin. >-= --> http://www.matronics.com/contribution >-=========================================================== > >


    Message 9


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    Time: 09:53:56 AM PST US
    From: Paul Mulwitz <psm@att.net>
    Subject: Re: Nose wheel fork failure
    Hi Rick, One problem I have had with "Yankee" type planes has to do with the lack of nose wheel steering when taking off in a crosswind. I found I had to apply brakes to one side while using takeoff power to keep the plane pointed down the runway for the initial takeoff run. I suppose the rudder will keep it pointed down the runway when enough speed is reached for rudder effectiveness, but in the beginning you are applying opposing forces, throttle and brakes, at the same time in order to perform a normal operation. (My brief experience with this problem was in a rented AA5 many years ago.) I agree with your point about taxi control with the brakes. It works just fine. However, I prefer the steerable nose wheel for taxiing too. It is true that the free castering nose wheel can make a tighter turn, but I have found the typical Cessna arrangement turns tighter if you use both differential braking and nose steering together. I am currently flying a Tecnam Echo that has a brake handle and nose steering. This turns OK, but I find it won't turn quite as tight a circle on the ground as I would prefer. It takes a little planning to turn into the wind for run-up and then get back to the heading for getting to the runway. This wouldn't be a problem with a large run-up pad, but that is not what you find at my home airport. Best regards, Paul XL awaiting engineering changes At 08:42 AM 10/25/2009, you wrote ><tigerrick@mindspring.com> > >Not to pick a fight here, Larry, but after flying close to 5000 >hours in Grumman American airplanes with free castering nose gear, I >have to object to your post.


    Message 10


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    Time: 12:58:01 PM PST US
    From: LarryMcFarland <larry@macsmachine.com>
    Subject: Re: Nose wheel fork failure
    Hi Rick, I certainly understand your perspective and for fast maneuvering on the ground, or ease of pulling thru uneven grass or avoiding objects during taxi, the steering nose wheel probably has an edge. I too have flown both types and disliked having to rev the prop to get one wheel or the other loose from soggy ground. The free caster nose wheel can touch down out of the line of travel and jerk the nose with it and the same thing for steerable, but you have to be inattentive for that to happen. On reverse handling for the steerable you need a tow bar. For the Zenith the strut doesn't lend any structural advantage to a free caster nose wheel. On the Grumman, the designers took all structural issues into consideration to accomplish their nose gear. Respectfully, Larry McFarland 601HDS at www.macsmachine.com Do not archive Rick Lindstrom wrote: > > Not to pick a fight here, Larry, but after flying close to 5000 hours in Grumman American airplanes with free castering nose gear, I have to object to your post. > > Besides the obvious simplicity and ease of maintenance of the free castering design, its 180 degree pivot allows for incredibly tight turns while parking or simple maneuvering around objects. Assuming the airplane doesn't have a draggy brake on one side or the other, taxiing is a breeze with an occasional tap on the brake to maintain directional control. > > The only negative I can see is replacing brake pads slightly more often, but pads are cheap and there's no linkage, springs, holes in the firewall, or any of the other hoopla associated with a steerable nosewheel. And best of all, the nose wheel alignment to the runway self corrects automatically upon landing, so any worry about side loads is moot. > > Your claim that it's "a much lesser solution" needs some qualification. I'm curious, in what way? > > Best, > > Rick Lindstrom > ZenVair N42KP >


    Message 11


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    Time: 04:38:24 PM PST US
    Subject: Re: Nose wheel fork failure
    From: "Ron Lendon" <rlendon@comcast.net>
    larry(at)macsmachine.com wrote: > > Curious how the nose wheel steering got sideways far enough to fail the > fork. Or it would seem > there was not enough attention to where the nose wheel was at the time. > Larry, As I recall the XL plunks down the nose wheel right down after touching the mains in a full stall landing (only flew one once). It also had the main gear reversed from the design position. The photo guide has many pictures of the main gear in the reversed position, it is noted that the pictures are not correct but many people have followed those pictures and have a heavy nose wheel as a result. Don't know if this is the case here but it merits discussion. -------- Ron Lendon, Clinton Township, MI WW Corvair with Roy's Garage 5th bearing Zodiac XL, ScrapBuilder ;-) http://www.mykitlog.com/rlendon Corvair Engine Prints: http://home.comcast.net/~rlendon/site/ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269390#269390


    Message 12


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    Time: 05:05:11 PM PST US
    From: Afterfxllc@aol.com
    Subject: First Flight
    Hi All Well today after much aggravation with the Aero Carb on the Corvair engine we decided to switch to a MA-3A and had it rebuilt with a MA-3SPA nozzle to richen it up slightly. We taxied the plane 4 or 5 times thru all power setting before our test pilot was called to duty. Ralph (test pilot) had flown with me in the first 601xl I built so he was not as nervous as a first time test pilot would be flying behind a Corvair or even the 601 for that matter. The first flight went off without a hitch and the Corvair preformed as expected the prop is set at 10 1/2 degrees 2700 to 2800 static and 2900 109 MPH climb out. The CHT's were around 300 and the oil temp was 210 degrees before the cooler EGT's were around 1,200 degrees. All the parts on this plane are from Aerolite and the new Tech that picks up from the AC side of the alt worked great also (No more flywheel pickup). The new cowling and ram air Baffles really keep the temps down but I know our oil cooler setup works better than any other cooler out there when combined with our baffles. Tomorrow I will fit the wheel Pants and tinker with the trim a bit but all and all a great day. Watch the First Flight on U-tube _http://www.youtube.com/watch?v=XwNrpIMhr_A_ (http://www.youtube.com/watch?v=XwNrpIMhr_A) Jeff _www.aeroliteproducts.com_ (http://www.aeroliteproducts.com)


    Message 13


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    Time: 05:20:21 PM PST US
    From: "KARL POLIFKA" <jfowler120@verizon.net>
    Subject: Re: Nose wheel fork failure
    I've stayed out of this but -- a couple of comments. We've had one or more hard landings because of the nose thump-down habit -- more than one in gusty conditions. This eventually led to a firewall and stiffener replacement -- along with the phenolic block in the lower main gear. We've changed a few things, besides the repairs. Half flap approaches, full nose up trim, 60 kias on final to touch down. Makes for a much smoother landing and virtually no touchdown nosegear thump. Also, BTW, hold the stick back with some nose up trim on takeoff -- it takes the pressure off a weak point in this airplane. As to this incident -- it certainly appears that you had rudder in you didn't realize or something was really wrong with the rudder-nose gear pushrods after taxi started. Prop strike -- hope you are getting an engine teardown to check the interior! Karl ----- Original Message ----- From: Ron Lendon To: zenith601-list@matronics.com Sent: Sunday, October 25, 2009 7:38 PM Subject: Zenith601-List: Re: Nose wheel fork failure <rlendon@comcast.net> larry(at)macsmachine.com wrote: > > Curious how the nose wheel steering got sideways far enough to fail the > fork. Or it would seem > there was not enough attention to where the nose wheel was at the time. > Larry, As I recall the XL plunks down the nose wheel right down after touching the mains in a full stall landing (only flew one once). It also had the main gear reversed from the design position. The photo guide has many pictures of the main gear in the reversed position, it is noted that the pictures are not correct but many people have followed those pictures and have a heavy nose wheel as a result. Don't know if this is the case here but it merits discussion. -------- Ron Lendon, Clinton Township, MI WW Corvair with Roy's Garage 5th bearing Zodiac XL, ScrapBuilder ;-) http://www.mykitlog.com/rlendon Corvair Engine Prints: http://home.comcast.net/~rlendon/site/ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269390#269390


    Message 14


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    Time: 05:38:00 PM PST US
    Subject: Re: Nose wheel fork failure
    From: "Thruster87" <alania@optusnet.com.au>
    A follow up on the discussion so far,main gear reversed to lighten loads on to nose gear.As aircraft was starting to drift to the left a SMALL amount of right rudder applied to straighten back to center of runway [sealed] .As the nose was a foot or so off the ground when down elevator applied,I never dreamt that it would bounce and thump from that hight. But I do now.Repair bill including prop around $2000.00 :( Cheers T87 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269407#269407




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