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701SP Bubble doors

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s.clive.richards(at)homec
Guest

Posted: Sat Mar 01, 2014 12:45 pm Post subject: 701SP Bubble doors

Hi List

 I see from a accident report in UK that a set of  bubble doors broke up in flight, is this an isolated incident or have I missed  other reports? as we have a set for the plane we are building but may  now be banned from fitting.

 Clive

  

 do not archive

   [quote][b]

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dougsnash

Joined: 14 Apr 2008
Posts: 281

Posted: Sat Mar 01, 2014 1:52 pm Post subject: 701SP Bubble doors

If you are worried about the 701 doors coming off in flight I would recommend contacting Zenith and getting the latch kit for the 750.  The 750 door is a bit larger and has three latch points as opposed to the one on the 701.

Doug M

CH-701 from scratch

 

 

     On Saturday, March 1, 2014 2:51:12 PM, Clive Richards <s.clive.richards(at)homecall.co.uk> wrote:

   

           Hi List

 I see from a accident report in UK that a set of  bubble doors broke up in flight, is this an isolated incident or have I missed  other reports? as we have a set for the plane we are building but may  now be banned from fitting.

 Clive

  

 do not archive

   [quote]


om/Navigator?Zenith701801-List" target="_blank" rel="nofollow">http://wt; http://www.matronics.com/contri===============


[b]

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ggower_99(at)yahoo.com
Guest

Posted: Sat Mar 01, 2014 9:51 pm Post subject: 701SP Bubble doors

With more than 5 years (cant remember now) flying my  701  (about 300 hrs) and giving lots of rides... A few of them even without the doors.  

I dont see any problem with the latching system of the 701 doors...  



As in all aircraft: The Pilot (Captain) is responsible that the doors are correctly closed and the passengers seat belted and advised (Sit down, bucke up, dont touch, dont yell, dont complain:-)  Before every flight.



The big first diferences from driving and flying is the planning and the check list(s)...  I tell the parents of Young Eagles that learning to fly makes responsible boys.

Gary Gower.

 

 

     On Saturday, March 1, 2014 3:57 PM, MacDonald Doug <dougsnash(at)yahoo.com> wrote:

  

  If you are worried about the 701 doors coming off in flight I would recommend contacting Zenith and getting the latch kit for the 750.  The 750 door is a bit larger and has three latch points as opposed to the one on the 701.

Doug M

CH-701 from scratch

 

 

     On Saturday, March 1, 2014 2:51:12 PM, Clive Richards <s.clive.richards(at)homecall.co.uk> wrote:

   

           Hi List

 I see from a accident report in UK that a set of  bubble doors broke up in flight, is this an isolated incident or have I missed  other reports? as we have a set for the plane we are building but may  now be banned from fitting.

 Clive

  

 do not archive

    	  Quote: 	
		  


om/Navigator?Zenith701801-List" target="_blank" rel="nofollow">http://wt; http://www.matronics.com/contri===============


	






  

 

  

 

  	  Quote: 	
		  http://www.matro====================


	






  

 

  

 

 [quote][b]

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s.clive.richards(at)homec
Guest

Posted: Sun Mar 02, 2014 5:13 am Post subject: 701SP Bubble doors

Thanks for your replys However the reported problem  was not with the latches.

 The report from the pilot says The aircraft was  performing gentle manoeuvers at 100 mph when the pilot noted that both cabin  doors were bulging into the slipstream & almost instantly the left door  fractured and departed the airframe.

  These were the latest type bubble doors  with a composite frame.

  

 Just enquiring if anyone else flying with these  have had any problems or are happy with them, as I have seen no reports on  this list.

 Clive

 [quote]   ---

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dougsnash

Joined: 14 Apr 2008
Posts: 281

Posted: Sun Mar 02, 2014 6:53 am Post subject: 701SP Bubble doors

The only way that I have heard of the bubble doors failing in flight is if the latch pops and one opens up into the slipstream.  That is why I suggested supplementary latches as a potential solution (at least one which might pacify the UK authorities).  

The bubble shape of the door makes it act like an airfoil in flight and it is common for the doors to flex outwards a bit at the back edge.  depending on how much material was trimmed from the fiberglass frame during installation, it is possible that the door flexed enough for the main latch bar to lose contact with the doorframe and the door pop open.  In the slipstream at 100 mph the door could easily be ripped from the hinge or otherwise broken.   The pressure change from one door popping could explain why the second door opened as well.  While 100 mph doesn't sound like much, the VNE of the 701 is only 110 so really the plane was at the top end of its performance envelope.

All of this, of course, is idle speculation on my part.  All I know for sure is after about 240 hours on my plane the only issue I have had with my bubble doors has been the need for weather stripping as it gets pretty chilly here in Canada in January.

Doug M

 

 

      On Sunday, March 2, 2014 7:20:18 AM, Clive Richards <s.clive.richards(at)homecall.co.uk> wrote:

  

         Thanks for your replys However the reported problem  was not with the latches.

 The report from the pilot says The aircraft was  performing gentle manoeuvers at 100 mph when the pilot noted that both cabin  doors were bulging into the slipstream & almost instantly the left door  fractured and departed the airframe.

  These were the latest type bubble doors  with a composite frame.

  

 Just enquiring if anyone else flying with these  have had any problems or are happy with them, as I have seen no reports on  this list.

 Clive

 [quote]   ---

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Dusty

Joined: 09 Feb 2010
Posts: 6
Location: Central Maine

Posted: Wed Mar 12, 2014 1:30 pm Post subject: Re: 701SP Bubble doors

A few years back the left door on my 701 blew off. It bulged out when a wind gust hit me head on as I was climbing out. The door was latched. As someone else said, the weather stripping on the forward edge was non- existent. I thought there was an explosion! The door split diagonally and I was able to retain both halves inside the cabin so the tail feathers weren't injured. I have built a simple bolt latch the captures the door's leading edge at the vertical portion of the door frame. I'm confident that it will remain sealed. There is probably a hundred hours on the redesign.

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johngilpin

Joined: 23 Mar 2011
Posts: 93
Location: 004

Posted: Sat Mar 15, 2014 8:45 pm Post subject: 701SP Bubble doors

Please take note of this following incident......

http://www.stolspeed.com/701-door-warning



At the end of that article it shows how we added a sliding bar to the trailing edge of that door.  Since then we've added another sliding bar to the leading edge, so there are now three-points securing our doors.  Works very well.  I must get some photos of that arrangement and post them.

 

JG



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david30

Joined: 19 Oct 2014
Posts: 1

Posted: Mon Oct 20, 2014 8:30 pm Post subject: Re: 701SP Bubble doors

At the end of that article it shows how we added a sliding bar to the trailing edge of that door. ï¿½Since then we've added another sliding bar to the leading edge, so there are now three-points securing our doors. ï¿½Works very well. ï¿½I must get some photos of that arrangement and post them.

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frank goodnight

Joined: 27 Dec 2011
Posts: 126

Posted: Tue Oct 21, 2014 4:03 am Post subject: 701SP Bubble doors

Please post the photos

Frank



Sent from my iPhone



On Oct 20, 2014, at 11:30 PM, "david30" <cena4486(at)gmail.com> wrote:



 	  Quote: 	
		   

 

 At the end of that article it shows how we added a sliding bar to the trailing edge of that door. ï¿½Since then we've added another sliding bar to the leading edge, so there are now three-points securing our doors. ï¿½Works very well. ï¿½I must get some photos of that arrangement and post them.

 

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