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701 Stabilizer Front Mounting Bracket

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cffd(at)pgrb.com
Guest

Posted: Mon Aug 28, 2006 1:21 pm Post subject: 701 Stabilizer Front Mounting Bracket

The July/Aug 2006 issue of the Zenair News has a good atricle by Larry

Zetterlind.



It describes cracks in 7H2-6 (Stabilizer Front Mounting Bracket) and his

repair process.  He says that on his 701 the brackets were under a stress

due to a poor fit to the fuselage brackets.  (See Zenair Newsletter Sept/Oct

2005 for a good picture of this failure.)



Originally, this bracket was .040" aluminum but Zenith now uses .063".



I remember reading about this problem on this forum and I got the impression

that one cause of the cracking was due to the tail shaking during engine

start, particularly the Rotax 912.



Am I remembering correctly?



Chuck D.

N701TX

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RURUNY(at)aol.com
Guest

Posted: Mon Aug 28, 2006 1:40 pm Post subject: 701 Stabilizer Front Mounting Bracket

You are remembering correctly, but it was the 912s 100 hp engine which has  high compression that was causing this.I think the vibration issue was solved by  starting and stopping on one ignition module instead of both. I will be  inspecting my brackets regularly.

  

 Brian

  [quote][b]

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Dabusmith(at)aol.com
Guest

Posted: Tue Aug 29, 2006 4:48 am Post subject: 701 Stabilizer Front Mounting Bracket

The article you are referring to might have been of my plane. I had sent  this post in a couple of days ago but with a picture of my 701 attached so it  must not have made it through. I have been very happy with the modification of  the forward stab attach points.  

 I replaced the sprag clutch on my 912ULS recently. Now the engine starts  like new. The old clutch showed no visible wear so I was skeptical it would  make any difference. The job was much easier than I expected and Lockwood sent  everything I needed. I bought the Loctite gasket sealant for the ignition  cover at a local motorcycle dealer. My engine had been almost  violent during startup at times. This even led to cracks showing up at my  Horizontal attach brackets.  I was disappointed  Zenith had claimed my  cracked horizontal stab attach points were caused by assembly mismatch. That was  not the case. I made that point very clear to them. It appears to  have been the sprag clutch all along. I don't know exactly when the problem  started because it was so gradual. It was sometimes very hard to start when it  was cold. Even when it would start, it was very abrupt and shook the airframe  pretty hard. I had sent the gearbox in to Lockwood. They freshened it up  and turned it around in a day. That made a bit of an improvement, but it kept  getting worse. Replacing the starter sprag clutch seems to have cured the  problem. It has been two weeks now, including a trip to the Idaho back country  without a rough starting episode.  I had attended a Super Cub fly in at  Minam Ranch Oregon. The 701 can hold it's own. Although it lacks in the prop  clearance and turning radius, it costs a fraction to own and operate. By the end  of the fly in I had several tell me the 701 made them believers. Also, I landed  on all the strips down in Hell's canyon and didn't see any of the Cubs down  there! I did get two leaking tires from those huge sandspurs at Dug bar.  Fix-a-flat handled that with no problems.

 Best to all,

 Dave Smith

 Orting WA

 578 Hrs. 912ULS

 N701XL

  

 >do not archive<

  



  [quote][b]

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