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Re: Inverted Drop Test

Subject: Re: Inverted Drop Test
From: Miles McCallum <milesm@avnet.co.uk>
Date: Thu, 1 Feb 2001 08:59:46

Nic wrote:
> 
> Has the XS been tested for some kind of rollover protection standard?

Ah.... yes (in several crashes) - and found wanting: In the examples I have 
seen,
the
cockpit area remains pretty intact (even in severe crashes) but the arch aft of
the
windscreen collapses.


> Have there been any upgrading in the fleet?
> 
> It seems like a nice Kevlar rope inlay over the windscreen arch, supported
> aft by the roof board.
> Perhaps another arch aft at the spar up to the roof board.

We plan to deal with it by laying in some tows of carbon uni approx from seat 
front
outer corner to seat front outer corner over the whole arch, then bonding a 5mm
thick
filler to the forward face of the door flange (tapered to nothing below where 
the
door
flange goes horizontal) followed by more carbon - so the end result is a zZ box
(if you
see what I mean)

Don't think that a kevlar rope inlay will do anything - you need uni fibres 
running
laterally to deal with the loads...

M



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