Today's Message Index:
----------------------
1. 06:13 AM - Re: Re: Tail reinforcement... revisited (John Hauck)
2. 07:44 AM - Re: Re: Tail reinforcement... revisited (Rick Neilsen)
3. 02:03 PM - Tail up grades... (Nick Cassara)
4. 04:01 PM - Re: Tail up grades... (John Hauck)
5. 05:51 PM - Re: Tail up grades... (Larry Cottrell)
Message 1
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| Subject: | Re: Tail reinforcement... revisited |
Rebuild the lower tail fin with a heavier steel gusset and thicker wall
tubing. Which will support a full swivel locking tail wheel.
Dennis T/Kolbers:
The above is ok for a temporary fix. Eventually, the tail post will break
again. With larger and heavier repairs on my MKIII, we continued to
experience failures until my friend Dan Horton came up with the idea of two
external struts which create triangles that laterally brace the tail post.
Looks like lateral stress from ground handling is the culprit breaking our
tail posts.
Struts can be fabricated using 4130 or aluminum strap or tubing, and
attached with 3/16 bolts. No need for welding which creates a need for
paint and fabric repair.
Has anyone had a tail post failure after installing external struts?
john h
mkIII
Titus, Alabama
Message 2
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| Subject: | Re: Tail reinforcement... revisited |
I added 1/8 by 1 inch aluminum straps one on each side (like
John suggested) to better control the tail wheel stress on my VW powered
MKIIIC. I'm a big believer of learning from others. I figured the two
straps one acting in tension in each direction would be enough to
strengthen the tail post. I have about 400 hours on the fix with no issues.
I also have been criticized a few times about abusing the tail
with aggressive ground handling on rough ground.
Rick Neilsen
Redrive VW Powered MKIIIC
On Wed, Dec 5, 2012 at 9:12 AM, John Hauck <jhauck@elmore.rr.com> wrote:
>
>
>
> Rebuild the lower tail fin with a heavier steel gusset and thicker wall
> tubing. Which will support a full swivel locking tail wheel.
>
>
> Dennis T/Kolbers:
>
> The above is ok for a temporary fix. Eventually, the tail post will break
> again. With larger and heavier repairs on my MKIII, we continued to
> experience failures until my friend Dan Horton came up with the idea of two
> external struts which create triangles that laterally brace the tail post.
> Looks like lateral stress from ground handling is the culprit breaking our
> tail posts.
>
> Struts can be fabricated using 4130 or aluminum strap or tubing, and
> attached with 3/16 bolts. No need for welding which creates a need for
> paint and fabric repair.
>
> Has anyone had a tail post failure after installing external struts?
>
> john h
> mkIII
> Titus, Alabama
>
>
Message 3
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| Subject: | Tail up grades... |
Hello John,
Thanks for figuring out what I was trying to ask the "List." I think I
understand most of what you described, but where did you mount the "saddle"
on the boom. Was the Saddle haft the circumference on the boom tube, and
riveted to the boom?
What material did you use, " In addition to bracing the tail post" for this
bracing?
Thank you very much,
Nick Cassara
Palmer, AK
607AK
Message 4
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| Subject: | Tail up grades... |
where did you mount the =93saddle=94 on the boom. -Was the Saddle
haft the
circumference on the boom tube, and riveted to the boom? -
What material did you use, =93 In addition to bracing the tail post=94
for this
bracing?
Nick Cassara
Nick C/Kolbers:
I included the two previous photos of my lower vertical stabilizer and
tail
post braces. At the forward end of the lower vertical stabilizer the
4130
saddle is visible.
We fabricated the lower vertical stabilizer on my MKIII from 4130
because we
knew this was a high stress area during ground handling/taxi. The
saddle
was cut out of a section of 4130 tail boom ring, welded to the forward
end
of the lower vertical stabilizer and pop riveted to the bottom of the
tail
boom.
john h
mkIII
Titus, Alabama
Message 5
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| Subject: | Re: Tail up grades... |
I did it a little differently from John. I am sure that he and Jim did it
right, I modified an existing screw up and just drilled through the ring at
the back of the tube. The ring is under no stress, and a new hole in it
isn't going to hurt a thing, so I could find no reason to make it any more
complicated than necessary. I used some alum tubing for the brace. Just be
sure you don't split it when you flatten the ends. Your options are open
and do as you think right.
Larry
On Wed, Dec 5, 2012 at 3:03 PM, Nick Cassara <nickc@mtaonline.net> wrote:
> Hello John,****
>
> ** **
>
> Thanks for figuring out what I was trying to ask the =93List.=94 I think
I
> understand most of what you described, but where did you mount the =93sad
dle=94
> on the boom. Was the Saddle haft the circumference on the boom tube, and
> riveted to the boom? ****
>
> What material did you use, =93 In addition to bracing the tail post=94 fo
r
> this bracing?****
>
> ** **
>
> Thank you very much,****
>
> ** **
>
> Nick Cassara****
>
> ** **
>
> Palmer, AK****
>
> ** **
>
> 607AK****
>
> *
>
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