---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Wed 04/24/19: 4 ---------------------------------------------------------- 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 _____________________________________ Time: 12:29:00 AM PST US Subject: Europa-List: Re: Roll bar From: "John Wighton" 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 _____________________________________ Time: 02:24:49 AM PST US Subject: Re: Europa-List: Re: Roll bar From: Pete Watching with much interest...go John go! :-D Cheers, Pete > On Apr 24, 2019, at 3:28 AM, John Wighton 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 _____________________________________ Time: 12:45:54 PM PST US From: Fred Klein Subject: Europa-List: Europa accident 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 _____________________________________ Time: 01:06:28 PM PST US From: Richard Churchill-Coleman Subject: Re: Europa-List: 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 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 > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.