Watching with much interest...go John go! :-D
Cheers,
Pete
> On Apr 24, 2019, at 3:28 AM, John Wighton <john@wighton.net> wrote:
>
>
> I have been doing some engineering analysis (stressing) of the Europa
> structure.
The relative lack of crashworthiness caused by the design of the cockpit
A pillars has been noted. As long ago as 1999 the Flyer Europa MOD list
included
CF reinforcement of this area.
>
> Stiffening the A pillar itself will help somewhat, by increasing the
> collapsing
load. But the reinforcement must run down past the waist band. Thereafter
it can be tapered off to leave just normal structure.
>
> Making this change is all good structurally. I specific 8 plies of CF UD with
2 x plies of BID laid over. But the wiring loom needs to be moved lower to
avoid having to lay multiple cables over the resulting bump.
>
> The T shaped roof bar is sUrprisingly strong as standard. Some additional
> plies
are needed at the joint with the reinforced A pillar to ensure a hinge type
failure does not occur.
>
> My work continues - to investigate the occupant kinematics. This includes
> recording
HIC from impacts with the panel and supporting structure. When l get
the time l will look at the influence of the seatbelt anchorage positions vs HIC
and occupant internal injury levels.
>
> My ultimate aim is to develop a Survivability Index, derived from a
> standardised
test that can be applied during Certification (or design approval for Annex
aircraft). In theory this test could be simulated but depends very much upon
the methodology adopted.
>
> --------
> John Wighton
> Europa XS trigear G-IPOD
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> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=488925#488925
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