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
>
>
>
>
>
>
>
>
>
|