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Saddle damaging the stab skin

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mtherr(at)yahoo.com
Guest

Posted: Sun May 07, 2006 5:56 pm Post subject: Saddle damaging the stab skin

Hello Group!



I am slowly working on my annual inspection and when I

removed the fuselage saddle on top of the stabilizer,

I got a bad surprise.  The saddle made a faily deep

groove in the stab skin.  I remember setting it up

with a clearance so this would not happen, but I

suppose that things move with time and in flight.



Anyway, I think I'll double up the skin between the

two center ribs with a 0.025 or 0.020 piece of

aluminum.  



So flying friends, when you have time, check

underneath the saddle to see if you have the same

problem.



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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xl(at)prosody.org
Guest

Posted: Sun May 07, 2006 9:51 pm Post subject: Saddle damaging the stab skin

I wasn't comfortable using the saddle as the rudder stop.

Neither was my EAA tech counselor. We were concerned that

it could move around too much - not positive enough.

So I riveted a metal stop to keep the elevator from using

the saddle as the stop. Sounds like the elevator would have

pushed the saddle into my skin too.



I also didn't like using the edges of the skins/longerons

as the bottom stops. So, I used a couple of angles as the

bottom stops. This was a good thing to do. Because, the front

of the elevator contacted the edge of the rear stabilizer mounting

bracket (don't remember the technical name) in one small spot.

(Yes, things do tend to move around after your flying.)

And it made a slight dent where it touched. The same thing,

but worse, may have happened to the bottom of the elevator

if it was allowed to rest on the edge of the skins. On the

ground, if you let go of the stick the elevator falls and hits

the stops - or the edge of the skins.



(This is my 4th post today. A record for me.

The clouds were too low for me yesterday and today the

wind was 15kt, gusts 20kt at 90 degrees across the runway.

I was tempted but I stayed on the ground.....)



Thanks for the report, Joe E

N633Z (at) BFI

332 hours

CH601XL

On Sun, 7 May 2006, Michel Therrien wrote:

 	  Quote: 	
		   

 Hello Group!

 I am slowly working on my annual inspection and when I

 removed the fuselage saddle on top of the stabilizer,

 I got a bad surprise.  The saddle made a faily deep

 groove in the stab skin.  I remember setting it up

 with a clearance so this would not happen, but I

 suppose that things move with time and in flight.

 .......snip

 Michel

 do not archive

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mtherr(at)yahoo.com
Guest

Posted: Mon May 08, 2006 3:15 am Post subject: Saddle damaging the stab skin

JFYI, I am not using the saddle as a stop.  I really

did not like the idea of using something that fragile

to retrain a control surface.  



For the elevaor down stop, I originally attached a

piece of L angle to the fuselage so the elevator could

rest on a flat piece of metal.  Nevertheless, what you

described happened.  With the continuous friction on

the ground, the skin got ground on the elevator.  I

intend to pull it, grind it to reduce the potential

for cracks and double the area with a 0.040" (and

replaceable) alum sheet for the contact area.



Michel

--- xl <xl(at)prosody.org> wrote:

 	  Quote: 	
		   And it made a slight dent where it touched. The same

 thing,

 but worse, may have happened to the bottom of the

 elevator

 if it was allowed to rest on the edge of the skins.

 On the

 ground, if you let go of the stick the elevator

 falls and hits

 the stops - or the edge of the skins.

 


	


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

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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