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Murphy's law did not apply

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mtherr(at)yahoo.com
Guest

Posted: Mon Apr 17, 2006 6:55 pm Post subject: Murphy's law did not apply

Hello group! 



Well, this evening, I've been lucky with some bad luck

(or more precisely, bad design).



After dinner, I decided to go flying at sunset.  I

departed CSB3 at 19h30EAT and went to Mascouche

(CSK3).  Then, I took position to depart from runway

11.  Several seconds after applying full throttle, the

engine came back to idle and the throttle lever was

non effective.  The plane started to decelerate on the

runway.



I parked it at the end of the runway, removed the

cowling and quickly noticed that my throttle lever was

disassembled.  When I modified the carburetor, I cut

down the throttle lever and made a plate what would

accomodate the throttle push rod I'm using.  This

plate is (or was) attached to the Carburetor throttle

arm with two A5 Avex rivets.  



The plane flew more than 200 hours before the rivets

failed ant the plate detached from the throttle arm!



Should Murphy have made this happen 10 seconds later,

I,would have been in deep s..t (there are no good

options for emergency landings during a moment after

take off on that runway).  But the law did not apply

and I simply had a good workout pulling the plane to a

hangar I have access to (which was near the other end

of the runway).



Here are some pictures showing that plate:



http://mthobby.pcperfect.com/ch601/images/DCP02135.JPG

http://mthobby.pcperfect.com/ch601/images/DCP02158.JPG



This being said, I would suggest looking at any

situation where a couple of rivets hold a critical

part that is subject to constant stress and vibration.

 These two rivets will be replaced with two AN3 bolts

and lock nuts in the next few days!



Michel 

----------------------------

Michel Therrien CH601-HD, C-GZGQ

  http://mthobby.pcperfect.com/ch601

  http://www.zenithair.com/bldrlist/profiles/mthobby

  http://pages.infinit.net/mthobby

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JohnDRead(at)aol.com
Guest

Posted: Mon Apr 17, 2006 7:15 pm Post subject: Murphy's law did not apply

Hi Michel:

                Were  the rivets steel or aluminum?

 

John (soon to start building a CH710)

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JohnDRead(at)AOL.COM
Guest

Posted: Mon Apr 17, 2006 7:20 pm Post subject: Murphy's law did not apply

Hi Michel:

                I  took look at your pictures. Why did you not weld the 

modified bracket as opposed  to rivets?

 

John

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nfivesl(at)yahoo.com
Guest

Posted: Mon Apr 17, 2006 7:27 pm Post subject: Murphy's law did not apply

Michel that is very timely news!  A few days ago I

made a similar installation on my throttle where I

installed two rivets - then, the day after I installed

it, I drilled them out and installed AN3 bolts because

it didn't feel right after sleeping on it!  



It's good to hear you got a break on that one!



Scott Laughlin



--- Michel Therrien <mtherr(at)yahoo.com> wrote:



 	  Quote: 	
		   

 <mtherr(at)yahoo.com>

 

 Hello group! 

 

 Well, this evening, I've been lucky with some bad

 luck

 (or more precisely, bad design).

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mtherr(at)yahoo.com
Guest

Posted: Tue Apr 18, 2006 2:19 am Post subject: Murphy's law did not apply

The plate is made of 6061-t6, 0.063".  It would sure

be a better idea to weld a 4130 plate, but at that

time, I had no steel and no talent for welding. 



I looked at my plate yesterday, no distorsion on it,

no cracks and the hole for the pushrod is still very

much round... I'll put it back in.



do not archive.



--- JohnDRead(at)aol.com wrote:



 	  Quote: 	
		   

 

 Hi Michel:

                 I  took look at your pictures. Why

 did you not weld the 

 modified bracket as opposed  to rivets?

  

 John

 

 

 

 



 browse

 Subscriptions page,

 FAQ,

 http://www.matronics.com/Navigator?Zenith-List

 Admin.



 

 

 

  

  

  

 

 

 

 


	




----------------------------

Michel Therrien CH601-HD, C-GZGQ

  http://mthobby.pcperfect.com/ch601

  http://www.zenithair.com/bldrlist/profiles/mthobby

  http://pages.infinit.net/mthobby

- The Matronics Zenith-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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mtherr(at)yahoo.com
Guest

Posted: Tue Apr 18, 2006 2:19 am Post subject: Murphy's law did not apply

The rivets were the A5 Avex rivets that we use to

build the plane....  I know one of my friend has a

similar setup, but with AD rivets (solid rivets) and

he has not have that situation. (yet?) Seriously, I

don't think our soft pull rivets measure up with AD

solid rivets in term of resistance to fatigue and

strenght.



Michel

do not archive



--- JohnDRead(at)aol.com wrote:



 	  Quote: 	
		   

 

 Hi Michel:

                 Were  the rivets steel or aluminum?

  

 John (soon to start building a CH710)

 

 

 

 



 browse

 Subscriptions page,

 FAQ,

 http://www.matronics.com/Navigator?Zenith-List

 Admin.



 

 

 

  

  

  

 

 

 

 


	




----------------------------

Michel Therrien CH601-HD, C-GZGQ

  http://mthobby.pcperfect.com/ch601

  http://www.zenithair.com/bldrlist/profiles/mthobby

  http://pages.infinit.net/mthobby

- The Matronics Zenith-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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bill_dom(at)yahoo.com
Guest

Posted: Tue Apr 18, 2006 4:33 am Post subject: Murphy's law did not apply

I read or saw somewhere that throttle linkage need to

be installed in such way that in case of failure, the

spring should open the throttle to full position

instead of closing it. Then you will use mixture

control to reduce power and when in final for landing,

you can turn off the engine and glide to the runnway.

I thought this was common practice. Is there a reason

why not to do this?



William Dominguez

Plansbuilt Zodiac 601XL



--- Michel Therrien <mtherr(at)yahoo.com> wrote:



 	  Quote: 	
		   

 <mtherr(at)yahoo.com>

 

 Hello group! 

 

 Well, this evening, I've been lucky with some bad

 luck

 (or more precisely, bad design).

 

 After dinner, I decided to go flying at sunset.  I

 departed CSB3 at 19h30EAT and went to Mascouche

 (CSK3).  Then, I took position to depart from runway

 11.  Several seconds after applying full throttle,

 the

 engine came back to idle and the throttle lever was

 non effective.  The plane started to decelerate on

 the

 runway.

 

 I parked it at the end of the runway, removed the

 cowling and quickly noticed that my throttle lever

 was

 disassembled.  When I modified the carburetor, I cut

 down the throttle lever and made a plate what would

 accomodate the throttle push rod I'm using.  This

 plate is (or was) attached to the Carburetor

 throttle

 arm with two A5 Avex rivets.  

 

 The plane flew more than 200 hours before the rivets

 failed ant the plate detached from the throttle arm!

 

 Should Murphy have made this happen 10 seconds

 later,

 I,would have been in deep s..t (there are no good

 options for emergency landings during a moment after

 take off on that runway).  But the law did not apply

 and I simply had a good workout pulling the plane to

 a

 hangar I have access to (which was near the other

 end

 of the runway).

 

 Here are some pictures showing that plate:

 



http://mthobby.pcperfect.com/ch601/images/DCP02135.JPG
	


 	  Quote: 	
		  

http://mthobby.pcperfect.com/ch601/images/DCP02158.JPG
	


 	  Quote: 	
		   

 This being said, I would suggest looking at any

 situation where a couple of rivets hold a critical

 part that is subject to constant stress and

 vibration.

  These two rivets will be replaced with two AN3

 bolts

 and lock nuts in the next few days!

 

 Michel 

 

 

 ----------------------------

 Michel Therrien CH601-HD, C-GZGQ

   http://mthobby.pcperfect.com/ch601

   http://www.zenithair.com/bldrlist/profiles/mthobby

   http://pages.infinit.net/mthobby

 

 

 

 



 browse

 Subscriptions page,

 FAQ,

 http://www.matronics.com/Navigator?Zenith-List

 Admin.

- The Matronics Zenith-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?Zenith-List

mtherr(at)yahoo.com
Guest

Posted: Tue Apr 18, 2006 7:47 am Post subject: Murphy's law did not apply

I had the same thought yesterday... I heard that Rotax

engines are designed this way (full throttle in case

of throttle failure).  I'll be looking at how to

implement something similar on my installation.



Michel

PS: But all of this is temporary   More on that

very soon!

--- William Dominguez <bill_dom(at)yahoo.com> wrote:



 	  Quote: 	
		   

 <bill_dom(at)yahoo.com>

 

 I read or saw somewhere that throttle linkage need

 to

 be installed in such way that in case of failure,

 the

 spring should open the throttle to full position

 instead of closing it. Then you will use mixture

 control to reduce power and when in final for

 landing,

 you can turn off the engine and glide to the

 runnway.

 I thought this was common practice. Is there a

 reason

 why not to do this?

 

 

 

 William Dominguez

 Plansbuilt Zodiac 601XL

 

 


	


----------------------------

Michel Therrien CH601-HD, C-GZGQ

  http://mthobby.pcperfect.com/ch601

  http://www.zenithair.com/bldrlist/profiles/mthobby

  http://pages.infinit.net/mthobby

- The Matronics Zenith-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?Zenith-List

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