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nickc(at)mtaonline.net
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 Posted: Tue Nov 12, 2013 2:37 pm Post subject: More info on tailwheel 4130 tube needed... |
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Hello Kolb Flyers,
A little while back a couple folks talked about replacing the Aluminum tail wheel tube with a piece of 4130 steel. I talked to my local shop and they want to know what wall thickness is being used and they are unsure about the Hardness available, but would see what they could get…
Any additional information would be much appreciated !
Thanks,
Nick
Palmer, Ak
0607AK
[quote][b]
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Tue Nov 12, 2013 5:32 pm Post subject: More info on tailwheel 4130 tube needed... |
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A little while back a couple folks talked about replacing the Aluminum tail wheel tube with a piece of 4130 steel. I talked to my local shop and they want to know what wall thickness is being used and they are unsure about the Hardness available, but would see what they could get…
Any additional information would be much appreciated !
Thanks,
Nick | Quote: | | Nick: .120 wall thickness. Heat treat to 48RC. Heat treating should be done after all welding, drilling, etc. The length of the tail wheel strut can be reduced by about a half of whatever the plans call for. Don't know why Homer liked the tail wheel strut so long. |
0123
[quote][b]
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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Larlaeb
Joined: 02 Apr 2013
Posts: 75
Location: League City, Texas United States
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| Posted: Tue Nov 12, 2013 8:09 pm Post subject: Re: More info on tailwheel 4130 tube needed... |
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Recently I did the same thing. Same thickness and hardness. I waited until after it was hardened to drill and it is a little more difficult. However with a slow speed and cutting oil I didn't have any trouble with a new carbide bit. In my case I'm glad I did it that way because the hardening process caused the tubing to curve slightly and I was able to use the slight curve to my advantage (up and down rather than side to side). Perhaps a better hardening outfit can avoid the distortion but I was told it was hard to avoid on stuff this thin. I like the way it rides better than with the solid aluminum, has some spring to it.
Allan
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rowedenny
Joined: 09 Mar 2008
Posts: 338
Location: Western PA
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| Posted: Wed Nov 13, 2013 5:34 am Post subject: More info on tailwheel 4130 tube needed... |
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That is a surprisingly thick wall for that little 3/4 inch rod! 😳
Dennis "Skid" RoweMk3, 690L-70, Leechburg, PA
On Nov 12, 2013, at 8:32 PM, "John Hauck" <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)> wrote:
[quote] 1024x768 <![endif]--> Clean false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 <![endif]--> <![endif]-->/* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} <![endif]--> <![endif]--> <![endif]-->
A little while back a couple folks talked about replacing the Aluminum tail wheel tube with a piece of 4130 steel. I talked to my local shop and they want to know what wall thickness is being used and they are unsure about the Hardness available, but would see what they could get…
Any additional information would be much appreciated !
Thanks,
Nick | Quote: | | Nick: .120 wall thickness. Heat treat to 48RC. Heat treating should be done after all welding, drilling, etc. The length of the tail wheel strut can be reduced by about a half of whatever the plans call for. Don't know why Homer liked the tail wheel strut so long. |
0123
4
[b]
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Wed Nov 13, 2013 6:02 am Post subject: More info on tailwheel 4130 tube needed... |
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That is a surprisingly thick wall for that little 3/4 inch rod! 😳
Dennis "Skid" Rowe
Mk3, 690L-70, Leechburg, PA
| Quote: | | Dennis: That's what it takes to get the job done on my MKIII. I also have a plate welded to the end on my tail wheel strut to mimic a flat tail spring to attach a Maule tail wheel. Works well. |
012
[quote][b]
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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Larlaeb
Joined: 02 Apr 2013
Posts: 75
Location: League City, Texas United States
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| Posted: Wed Nov 13, 2013 6:08 am Post subject: Re: More info on tailwheel 4130 tube needed... |
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Possibly overkill from a strength perspective but there is a lot of twisting force on that rod/tube when you start shoving the tail around and the bolt that holds it in tends to wallow out the hole so my take would be that the thicker stuff helps prevent that a bit.
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