The normal rule of thumb given to me by Andy some time ago for a mod was 3
times the mass of glass which is being removed, to be applied around the
perimeter of the hole. Francis Donaldson also accepted my modification on
this basis.
(My mod. was an access hole to the tank via a cockpit module hole between
the headrests).
Dave Simpson
----- Original Message -----
From: Nigel Charles <72016.3721@compuserve.com>
Subject: Re: Cockpit cooling
> Message text written by Fred Fillinger
> >I assume that conclusion was reached without documented engineering
> analysis of the strucure itself, then in various crash scenarios. A
> good engineer can eyeball something to a reasonable conclusion, but
> that same engineer should be able to then "thumbnail" how much glass
> reinforcement goes underneath the little hole in the door sill to
> return strength, no?<
>
> That may well be the case but the PFA has only two engineers and they are
> overworked as it is. They simply do not have the time to investigate this
> themselves. If someone (who is a qualified engineer) wants to do the work
> and present it to them they might entertain it.
>
> Nigel Charles
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