Europa-List Digest Archive

Sat 10/31/15


Total Messages Posted: 4



Today's Message Index:
----------------------
 
     1. 02:50 AM - Re: BRS (Rowland Carson)
     2. 05:56 AM - Re: BRS (John Wighton)
     3. 06:36 AM - Re: BRS (davidjoyce@doctors.org.uk)
     4. 06:36 AM - Re: Tri Gear Main Wheels (AirEupora)
 
 
 


Message 1


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    Time: 02:50:59 AM PST US
    Subject: Re: BRS
    From: Rowland Carson <rowlandcarson@gmail.com>
    On 2015-10-31, at 01:06, Wladimir Kummer <wladimirkummer@gmail.com> wrote: > Do you know of any Europa with a BRS? Im considering installing one in my MotorGlider. Still have the fuse top not bonded so I figure would be a not so difficult mod. Wladimir - there was much work done on a BRS mod on kit 251 in UK. Miles McCallum published a series of articles in Flyer magazine on his progress (might be some info still available in online archives?). I seem to recall that there was a lot of calculation needed to determine the routing and termination of the cables etc to ensure the integrity of load paths. I think the extra weight introduced was quite a penalty too. I believe the BRS mod proposal was eventually abandoned by Miles. The kit was eventually sold on unfinished, is now registered G-MLXP and may be flying. My feeling is that a BRS system needs to be thought about at the basic design stage for the aircraft, not tacked on as an afterthought - particularly for composite structures. in friendship Rowland | Rowland Carson ... that's Rowland with a 'w' ... | <rowlandcarson@gmail.com> http://www.rowlandcarson.org.uk | Skype, Twitter: rowland_carson Facebook: Rowland Carson | pictures: http://picasaweb.google.com/rowlandcarson


    Message 2


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    Time: 05:56:10 AM PST US
    Subject: Re: BRS
    From: "John Wighton" <john@wighton.net>
    I am the engineer who did the load calcs and tried to route the BRS installation efficiently for Miles' Europa. The rear mounted BRS was mounted to a structure in the aft bay, the strops were routed forward to the engine mount hard points and to the spar. There were shallow channels in the composite skins which gave significant stress issues (local monolithic reinforcements, removal of foam core) caused by the load offset and subsequent local bending moments. We devised a suitable scheme, l think Miles did some tests of the layup, showing the break-out force of the strop though the outer skin ply. I did some work to determine the dynamic load factor caused by the chute opening, at that time BRS were developing their system. The work was discussed with the PFA engineers who raised plenty of opposition and concerns. I think the final straw came when the (unused) BRS unit had to be re-packed to keep it in service. Miles and Ian abandoned the scheme and we pushed on with the taildragger mods. My own recommendation is that unless the primary structure of the aircraft is designed from the onset for the installation of the BRS (generic term intended) unit and associated load carrying strops, then forget it. Wear a parachute instead maybe. -------- John Wighton Europa XS trigear G-IPOD Read this topic online here: http://forums.matronics.com/viewtopic.php?p=448413#448413


    Message 3


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    Time: 06:36:43 AM PST US
    From: davidjoyce@doctors.org.uk
    Subject: Re: BRS
    Vladimir, The Europa has excellent small, rough field landing capabilities and the motor glider even more so., ESPECIALLY IF A MONO. The Rotax serries of engines have excellent reliability. I would feel that contemplating a BRS system is vitually pointless, and inevitably would add significant weight. Much better to concentrate on building it as light as possible. Regards, David Joyce, GXSDJ On 2015-10-31 09:50, Rowland Carson wrote: > > On 2015-10-31, at 01:06, Wladimir Kummer <wladimirkummer@gmail.com> wrote: > >> Do you know of any Europa with a BRS? I'm considering installing one in my MotorGlider. Still have the fuse top not bonded so I figure would be a not so difficult mod. > > Wladimir - there was much work done on a BRS mod on kit 251 in UK. Miles McCallum published a series of articles in Flyer magazine on his progress (might be some info still available in online archives?). I seem to recall that there was a lot of calculation needed to determine the routing and termination of the cables etc to ensure the integrity of load paths. I think the extra weight introduced was quite a penalty too. I believe the BRS mod proposal was eventually abandoned by Miles. The kit was eventually sold on unfinished, is now registered G-MLXP and may be flying. > > My feeling is that a BRS system needs to be thought about at the basic design stage for the aircraft, not tacked on as an afterthought - particularly for composite structures. > > in friendship > > Rowland > > Links: ------ [1] http://www.rowlandcarson.org.uk [2] http://picasaweb.google.com/rowlandcarson [3] http://www.matronics.com/Navigator?Europa-List [4] http://forums.matronics.com [5] http://www.matronics.com/contribution


    Message 4


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    Time: 06:36:54 AM PST US
    Subject: Re: Tri Gear Main Wheels
    From: "AirEupora" <AirEupora@sbcglobal.net>
    If you do have to drill get a large number of cobalt drills and start with the small number 40 or smaller. Then drill it out to sized. It took me two or three hours with a hand drill. Rick Stockton N120EJ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=448416#448416




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