Today's Message Index:
----------------------
1. 12:29 AM - Re: Roll bar (John Wighton)
2. 02:24 AM - Re: Re: Roll bar (Pete)
3. 12:45 PM - Europa accident (Fred Klein)
4. 01:06 PM - Re: Europa accident (Richard Churchill-Coleman)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=488925#488925
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
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
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=488925#488925
>
>
>
>
>
>
>
>
>
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Noting that compressive spinal injuries can result from the geometry of
the shoulder straps and seat back in the Europa in the event of an
accident or even just a hard landing, I fabbed these hinged risers which
eliminate the downward component of the resultant forces. Attached to
the shoulder harness embedment, the riser was tested with a hydraulic
press by applying 1500# (10 G=99s, assuming 150# upper body
weight) force forward across the slot which captures the straps.
In the down position, they permit normal entry and exiting; when
you=99re seated and slip into the shoulder straps, the straps
raise the riser to the upright position=9Dworks a
treat=9D.
Made from scraps of 1/8=9D plywood, 1/8=9D Lastafoam, and
BID, they weigh about a pound a piecehappy to share details
upon request.
Fred
A194
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Europa accident |
Hi Fred
By coincidence, I was just trying yesterday to remember who had created that mod
- Id be very grateful if you could supply some details as I am about to move
on to the seats and Im tall enough to worry about downward forces from the seatbelts!
Kind regards
Richard C-C
Sent from my iPhone
> On 24 Apr 2019, at 20:38, Fred Klein <freddythek10@gmail.com> wrote:
>
> Noting that compressive spinal injuries can result from the geometry of the shoulder
straps and seat back in the Europa in the event of an accident or even
just a hard landing, I fabbed these hinged risers which eliminate the downward
component of the resultant forces. Attached to the shoulder harness embedment,
the riser was tested with a hydraulic press by applying 1500# (10 Gs, assuming
150# upper body weight) force forward across the slot which captures the straps.
>
> In the down position, they permit normal entry and exiting; when youre seated
and slip into the shoulder straps, the straps raise the riser to the upright
positionworks a treat.
>
> Made from scraps of 1/8 plywood, 1/8 Lastafoam, and BID, they weigh about a pound
a piecehappy to share details upon request.
>
> Fred
> A194
>
>
> <DSCN0020.jpeg><DSCN0015.jpeg>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|