Awesome solution. Thx!
> On Sep 11, 2018, at 4:45 PM, Erich Trombley <erichdtrombley@juno.com> wrot
e:
>
> Hi Barry,
>
> Glad to hear you didn't sustain any damage to your plane. Typical of othe
r Mono folks I too bent my tail wheel bolt which led me to creating the foll
owing mod I performed over 10 years ago. Never had a problem since. The or
iginal design relies on the AN5-21A bolt to counter the torsional load of th
e tail spring which isn't ideal as you can attest too. I created a simple m
od that takes the torsional load from the tail spring and transfers it to th
e XTW15 steel support plate rather than the AN5 bolt in bending. I installe
d an aluminum block with a channel milled down the middle (the width and hei
ght of the mounting end of the tail spring) with a through hole in the cente
r to pass the AN5 bolt. As shown in the attached drawing the block captivat
es the end of the tail spring and transfers the load as described above. Th
e AN5 bolt is now in double shear instead of single shear and bending. A lo
nger bolt is required to replace the existing AN5-21A which is too short to p
ass through the block. That's it. And it works a treat. You may not even r
equire approval of the mod as it could be considered a really thick washer o
f sorts. :) The mod also prevents the through hole in the bottom of the fus
elage in which the AN5 bolt passes from wallowing out.
>
> Also, regarding bonding of the tail spring to the rear stern post I deviat
ed slightly from the instructions. When I originally installed the tail spr
ing I was giving consideration to serviceability and realized if the spring w
ere bonded to the stern post I would need to deal with the Redux. Realizing
the benefit of having the additional bearing surface of the Redux I install
ed the tail spring per the manual, however, I applied a release to the tail s
pring such that the Redux wouldn't adhere. This allows the tail spring to b
e easily removed without compromising the design.
>
> Glad to answer any questions you may have.
>
> Regards,
> Erich
> N28ET Classic Mono 914
>
>
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>
> <MonoTailwheelSpringMod.pdf>
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