Today's Message Index:
----------------------
1. 02:31 AM - Re: Europa Classic Tail Spring Attachment (D McFadyean)
2. 02:43 AM - Re: Re: Europa Classic Tail Spring Attachment (D McFadyean)
3. 07:45 AM - Europa Classic Tail Spring Attachment (Erich Trombley)
4. 09:32 AM - Cushion for XS (Mallard)
Message 1
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Subject: | Europa Classic Tail Spring Attachment |
In my case the bolt breaks at a location around the top of the steel plate,
and just below the inner end of the threaded portion of the bolt. As might
be expected.
Duncan McF.
> On 25 June 2021 at 14:18 Bud Yerly <budyerly@msn.com> wrote:
>
>
> Ron,
>
> Many years ago I suggested a modification and all mono's that have go
ne through my shop have been modified. It allows a bit more security of th
e bolt, prevents bending and crushing of the glass/ply support. The top of
the bolt could bend if your metal sleeve is sloppy. So far, my clients ha
ve all held up. I'm afraid it has been many months since I've done a tail
spring mod. I've attached a drawing that may be some help.
>
>
>
> Essentially, I install my spring retaining bolt considerably differen
t. Review Mod 43. My additions are to hollow the skin out and lay reinfor
cing plys of bid on the belly. I add a 5/16 nominal washer to the recess.
>
> I then cut and fashion a chrome moly tube reaching the length of the
bolt from the metal plate down to the washer in the skin. The 7/16 0.065 w
all tube I used had to be reamed out for the 5/16 or 0.3125 inch bolt seeme
d to be firm enough to support full bolt torque but I=99m sure that a
0.049 wall is sufficient as the torque on the bolt is about 100-140 inch p
ounds which is not terribly high.
>
> Bud Yerly
>
> [Diagram Description automatically generated]
>
>
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com <owner-europa-list-serve
r@matronics.com> On Behalf Of Ron Peach
> Sent: Friday, June 25, 2021 4:09 AM
> To: europa-list@matronics.com
> Subject: Europa-List: Europa Classic Tail Spring Attachment
>
>
>
ailto:ronpeach1@gmail.com >
>
>
>
> Hi,
>
>
>
> Anyone had any issues with the tail spring attachment bolt fixing on
the Europa classic?
>
>
>
> The laid up ply and steel plate on mine appear to have been crushed e
ver so slightly but enough for me want to fix immediately. Can't feel any m
ovement but when i grab the spring and apply lateral pressure it creaks, in
dicating some movement even if I can't feel it.
>
>
>
> I read somewhere about a reinforcement fix but can't find the mod on
the LAA or Europa club site.
>
>
>
> Any help appreciated.
>
>
>
> Regards
>
>
>
> Ron
>
>
>
>
>
>
>
>
>
> Read this topic online here:
>
>
>
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Message 2
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Subject: | Re: Europa Classic Tail Spring Attachment |
Both efforts were an attempt to grab the flat end of the tailspring (in the manner
of a spanner) to redistribute resistance of the torsional load in the spring.
I would be inclined to just add a second steel plate on top of the spring, slightly
longer and with the ends bent down and welded to the outer edges of the lower
plate. Optional webbing between the two plates can be applied too if you
think the buckling loads induced into the top plate wouldn't be sustained.
Duncan McF.
> On 25 June 2021 at 20:05 Ron Peach <ronpeach1@gmail.com> wrote:
>
>
>
> Duncan, Bud,
>
> Thanks very much for responding. Bud your mod makes sense but at this stage I'm
looking for an easier solution. I am currently planning to replace the original
steel plate with an exact copy, re-bonding it to the ply/bid platform and
putting in a new bolt (I found indications of light corrosion on the bolt at
the point that it passed through the steel plate).
>
> In Graham Singletons mod (PFA 10371) he mentions using 1/8th sheet bent to form
a 1/2" by 1" angle to 'reduce the tendency to bend and crush the plywood/bid
reinforcement'. With no other detail, I presume that this would go on top of
the steel plate with the bolt passing through it as well. I can see how this
mini girder could help spread the load.
>
> I also read in a report (of a tail wheel failure) that six or seven mono owners
had fitted a mod that comprised of two light alloy plates bonded to either
side of a block of Paxolin. This was claimed to provided additional lateral support
for the bolt. The report stated that this mod was approved by the PFA but
I can't find any evidence of that.
>
> Anyone else out there with knowledge?
>
> Regards
>
> Ron
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=502602#502602
>
>
>
>
>
>
>
>
>
Message 3
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Subject: | Europa Classic Tail Spring Attachment |
Hi Ron,
I posted my solution to the forum a few years ago. Rather than have you sear
ch for it I resurrected it from archive. Typical of other Mono folks I too b
ent my tail wheel bolt which led me to creating the following mod I performe
d over 10 years ago. Never had a problem since. The original design relies o
n the AN5-21A bolt to counter the torsional load of the tail spring which is
n't ideal as you can attest too. I created a simple mod that takes the torsi
onal load from the tail spring and transfers it to the XTW15 steel support p
late rather than the AN5 bolt in bending. I installed an aluminum block with
a channel milled down the middle (the width and height of the mounting end o
f the tail spring) with a through hole in the center to pass the AN5 bolt. A
s shown in the attached drawing the block captivates the end of the tail spr
ing and transfers the load as described above. The AN5 bolt is now in double
shear instead of single shear and bending. A longer bolt is required to rep
lace the existing AN5-21A which is too short to pass through the block. That
's it. And it works a treat. You may not even require approval of the mod as
it could be considered a really thick washer of sorts. The mod also preven
ts the through hole in the bottom of the fuselage in which the AN5 bolt pass
es from wallowing out.
Also, regarding bonding of the tail spring to the rear stern post I deviated
slightly from the instructions. When I originally installed the tail spring
I was giving consideration to serviceability and realized if the spring wer
e bonded to the stern post I would need to deal with the Redux. Realizing th
e benefit of having the additional bearing surface of the Redux I installed t
he tail spring per the manual, however, I applied a release to the tail spri
ng such that the Redux wouldn't adhere. This allows the tail spring to be ea
sily removed without compromising the design.
Glad to answer any questions you may have.
Regards,
Erich
N28ET Classic Mono 914
Message 4
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Does anyone know what the best material is to use for a cushion in the XS to give
me a better view over the nose?
Also if anyone could give me dimensions (width x depth) for the pilot's seat cushion
as I don't have access to my own aircraft till the end of July.
Thanks in advance
James
--------
Seat of my pants
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