Pietenpol-List Digest Archive

Thu 02/16/12


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 07:03 PM - Spar problem (bender)
     2. 08:10 PM - Re: Spar problem (Don Emch)
     3. 08:50 PM - Re: Spar problem (Gary Boothe)
 
 
 


Message 1


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    Time: 07:03:03 PM PST US
    Subject: Spar problem
    From: "bender" <jfaith@solairusaviation.com>
    Hey guys... I'm kinda freaking out a little.. i built a one piece wing.. with solid 3/4 inch spars.. my right rear spar outboard of the strut attach point has warped a bit.. it moved down at the tip about a half an inch..it looks even more exaggerated at the trailing edge. i can lift the wing tip and make it all line up.. i assume they all have a bit of flexibility outside of the strut attach point I'm thinking i need to cut the spar and splice in a new section that is straight .. my other thought was maybe way off.. 43-13 allows a plywood doubler to be attached to reinforce a crack in a spar.. i wondered if i could jack up the wing tip and add a piece of 1/8 inch plywood to the rear of the spar to keep it in place.. from just inboard of the fitting to the tip... once the glue dried the ply should stabilize the spar and keep it from moving down again.. i'm afraid splicing in a new section may be the only hope.. but i wonder if air loads move the wing much.. jeff :( Read this topic online here: http://forums.matronics.com/viewtopic.php?p=366442#366442


    Message 2


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    Time: 08:10:04 PM PST US
    Subject: Re: Spar problem
    From: "Don Emch" <EmchAir@aol.com>
    Jeff... Do you think you can lengthen the right rear strut and take care of the problem by adding in some washout. The wings can really flex quite a bit. I realize the problem is outboard of the strut, but maybe you can move it up enough to cancel out that down warp. Don Emch NX899DE Read this topic online here: http://forums.matronics.com/viewtopic.php?p=366447#366447


    Message 3


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    Time: 08:50:05 PM PST US
    From: "Gary Boothe" <gboothe5@comcast.net>
    Subject: Spar problem
    Jeff, Exact same thing has happened to my left wing. It doesn't take very much pressure to straighten it. Before varnishing, I supported the spar on both ends, sprayed about 1 gallon of water on it, allowing it to soak in for about 30 seconds at each pass, and then hung about 50 lbs of weight at the center. That was plenty to pull the warp out, so I let it dry for several days. After removing the weight, most...not all...the warp had disappeared. It's varnished now, and has been hanging in the ceiling for about 2 months. Tomorrow I'll be bringing it down for fabric and will know if the fix stuck. I'll let you know.... Gary Boothe NX308MB -----Original Message----- From: owner-pietenpol-list-server@matronics.com [mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of bender Sent: Thursday, February 16, 2012 7:02 PM Subject: Pietenpol-List: Spar problem --> <jfaith@solairusaviation.com> Hey guys... I'm kinda freaking out a little.. i built a one piece wing.. with solid 3/4 inch spars.. my right rear spar outboard of the strut attach point has warped a bit.. it moved down at the tip about a half an inch..it looks even more exaggerated at the trailing edge. i can lift the wing tip and make it all line up.. i assume they all have a bit of flexibility outside of the strut attach point I'm thinking i need to cut the spar and splice in a new section that is straight .. my other thought was maybe way off.. 43-13 allows a plywood doubler to be attached to reinforce a crack in a spar.. i wondered if i could jack up the wing tip and add a piece of 1/8 inch plywood to the rear of the spar to keep it in place.. from just inboard of the fitting to the tip... once the glue dried the ply should stabilize the spar and keep it from moving down again.. i'm afraid splicing in a new section may be the only hope.. but i wonder if air loads move the wing much.. jeff :( Read this topic online here: http://forums.matronics.com/viewtopic.php?p=366442#366442




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