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freddythek10(at)gmail.com
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 Posted: Tue Apr 23, 2019 6:21 am Post subject: Roll bar |
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Pete...I reduxed a 5/8” flex tube as raceway and covered with 3 layers BID...definitely stiffened it up; if I’d been clever, I would have used CF.
Sent from my iPhone
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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John Wighton
Joined: 18 May 2010
Posts: 241
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| Posted: Tue Apr 23, 2019 11:28 pm Post subject: Re: Roll bar |
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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.
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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_________________
John Wighton
Europa XS trigear G-IPOD |
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peterz(at)zutrasoft.com
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| Posted: Wed Apr 24, 2019 1:24 am Post subject: Roll bar |
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Watching with much interest...go John go! 
Cheers,
Pete
| Quote: | On Apr 24, 2019, at 3:28 AM, John Wighton <john(at)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
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