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Mandatory U.K. LAA permit directive. Shoot-Bolt stop

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Duncan McFadyean

Joined: 18 Jan 2011
Posts: 222

Posted: Fri Dec 17, 2021 3:23 am Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

My main concern with the external mod is that an enthusiastic passenger that is not being 101% supervised will attempt to force the bolts against the new stop and, in doing so, will buckle the internal pushrod resulting in undetected(?) and diminished rear bolt engagement. Will the door still come unlatched?

At the very least, it still comes down to pre-flight checking that the door is adequately latched.



Duncan McF



 	  Quote: 	
		   On 17 December 2021 at 08:34 John Wighton <john(at)wighton.net> wrote:

 

 

 

 

 I think simple CFD is great but think it unwise to distribute snap shot s as they can be taken out of context.   The Europa fuse and canopy Are classic in form and will generate a range of differential pressures depending on speed, alpha, beta and altitude.  

 

 The net lift on the door can be calculated using data from a full sweep.  But that just tells us what we already know - that doors do depart the aircraft if the front pin disengages from the front socket.  

 

 In designing an alternate to the UglyMod, utilising a simple shear pin that  is inserted from inside, we retain the clean external shape of the aircraft.    It prevents the door opening enough to be ripped off.

 

 Emergency opening of the canopy from outside is achieved with a pry bar.

 

 Time will tell if the LAA is receptive.

 

 --------

 John Wighton

 Europa XS trigear G-IPOD

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=505286#505286

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ward.t(at)xtra.co.nz
Guest

Posted: Fri Dec 17, 2021 12:09 pm Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

ï»¿Agree with Duncan and John. My alternative is a visual check of the back bolt engaged with a red placard against the door rim. See photos below.  Not mandatory here in NZ due to the modification not being a Europa Aircraft Company mandatory mod.

Cheers,

Tim

[img]cid:99303AC1-F8EE-4B09-B63C-C35F0B2C77BB[/img]

[img]cid:81DC70FE-2FC1-4249-9C71-683BD2179750[/img]

Sent from my iPadTim Ward

12 Waiwetu Street, 

Fendalton, 

Christchurch, 8052

New Zealand.

ward.t(at)xtra.co.nz 

021 0640221

[quote]On 18/12/2021, at 12:30 AM, D McFadyean <ami-mcfadyean(at)talktalk.net> wrote:



ï»¿--> Europa-List message posted by: D McFadyean <ami-mcfadyean(at)talktalk.net>



My main concern with the external mod is that an enthusiastic passenger that is not being 101% supervised will attempt to force the bolts against the new stop and, in doing so, will buckle the internal pushrod resulting in undetected(?) and diminished rear bolt engagement. Will the door still come unlatched?

At the very least, it still comes down to pre-flight checking that the door is adequately latched.



Duncan McF



 	  Quote: 	
		  On 17 December 2021 at 08:34 John Wighton <john(at)wighton.net> wrote:

--> Europa-List message posted by: "John Wighton" <john(at)wighton.net>



I think simple CFD is great but think it unwise to distribute snap shot s as they can be taken out of context.   The Europa fuse and canopy Are classic in form and will generate a range of differential pressures depending on speed, alpha, beta and altitude.  



The net lift on the door can be calculated using data from a full sweep.  But that just tells us what we already know - that doors do depart the aircraft if the front pin disengages from the front socket.  



In designing an alternate to the UglyMod, utilising a simple shear pin that  is inserted from inside, we retain the clean external shape of the aircraft.    It prevents the door opening enough to be ripped off.



Emergency opening of the canopy from outside is achieved with a pry bar.



Time will tell if the LAA is receptive.



--------

John Wighton

Europa XS trigear G-IPOD





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=505286#505286



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