Dave,
I think it is practically impossible to reinstall the cables. A better
solution was perhaps to only add the tufnol strips on the existing
installations without failure in order to limit horizontal oscillations.
Karel Vranken # 447 F-PKRL
----- Original Message -----
From: "Moore, Dave" <Dave.Moore@lr.org>
Subject: Re: Europa-List: Mod 70 and the PFA letter
>
> May I ask the following via the forum, because I don't want to add to
> Andy Draper's bulging electronic in-tray or list of telephone calls...
>
> I've just had a look at the Mod 70 description (Thank you, Steve D) and
> wondered whether any of you have discussed, with Andy or PFA
> Engineering, the possibility of fatigue of the new unrestrained mass
> balance arm.?
>
> The new design, without the bracing cables, looks a recipe for a fatigue
> failure at or near to the TP18B fitting. (From vibration in the
> horizontal plane).
>
> It would make for some peace of mind to know that a fatigue analysis or
> tests have been conducted to demonstrate that the thicker wall tubing of
> the arm will be sufficient, in itself, not to suffer fatigue as it
> oscillates between the rubbing strips.
>
> Why didn't the new design retain the cables? It is a minor weight
> penalty, would its retention be overkill/over-engineering.?
>
> Regards,
>
> Dave Moore
>
> Monowheel 550
> Aberdeen UK
>
>
|