Pietenpol-List: Re: gussets grain orientation - empenage (rudder,fin,elevator,s

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Pietenpol-List: Re: gussets grain orientation - empenage (rudder,fin,elevator,s

Post by matronics »

Original Posted By: "Fairfield, Mike"
I have seen gussets made by cutting discs of plywood and then either cutting thedisc into quarter-rounds or half-rounds as necessary to gusset the joint. Ithought it looked very much nicer than angled pieces, although I will grant thatit adds nothing structurally except weight. I just thought it looked nice,especially if the gusset is cut from a color of wood that contrasts with theframing members.--------Oscar ZunigaMedford, ORAir Camper NX41CC "Scout"A75 powerRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
matronics
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Re: Pietenpol-List: Gusset plywood grain orientation

Post by matronics »

Original Posted By: Scott Knowlton
Good afternoon everyone, This is my first post as well. I am just starting to build a Pietenpol, long fuselage and a three piece wing. I'm not trying to be smart or rude, but don't you think that since plywood usually has an odd number of plies (3, 5, 7, etc.) that it would be a good idea to have that extra ply holding things together by having the grain running perpendicular to the axis or line of separation? I have been a VERY meticulous (commonly known as anal) mechanic for over thirty-five years, and I tend to study things too much before going ahead, but the above idea just seemed to make sense to me. Please feel free to disagree with me. I said I am meticulous, however meticulous doesn't always mean right. If you have any questions, please feel free to call. Thanks, Mike.Mike FairfieldTechnical SpecialistHewitt Equipment LimitedHeavy Equipment Division61 Jean-ProulxHull ,QuebecCanada J8Z 1W2Tel: 819-770-1601 Ext. 4873Cell: 819-598-3561mfairfield(at)hewitt.ca________________________________________________________________________________Subject: Re: Pietenpol-List: Gusset plywood grain orientation
matronics
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Joined: Sat Mar 18, 2017 8:29 am

Post by matronics »

Original Posted By: "Boatright, Jeffrey"
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matronics
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Re: Pietenpol-List: Gusset plywood grain orientation

Post by matronics »

Original Posted By: "Fairfield, Mike"
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Pietenpol-List: Re: Gusset plywood grain orientation

Post by matronics »

Original Posted By: "taildrags"
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Pietenpol-List: Re: Gusset plywood grain orientation

Post by matronics »

Original Posted By: "tools"
Disclaimer: I am not a structural engineer but I think you could spend a lot oftime analyzing the forces on each joint that you're going to apply gussets to,optimize the direction of the grain of the plywood gusset, and not improve thecompetency of the wood structure of an Air Camper perceptibly.Picture a side view of one of the fuselage sides. At any given framing memberintersection there are verticals and there are diagonals intersecting the upperand lower longerons. Are you going to optimize the gusset grain direction forthe vertical, the horizontal, or the diagonal? Each of them has forces actingon it. One might argue that without analyzing the forces at each connectionto determine which is the greatest, the best compromise might be to orientthe grain at 45 degrees.The point is, the gusset prevents the connection from rotating such that it stressesthe glue joints. The 3-ply gusset material just needs to be stiff enoughto keep from buckling as the connection attempts to rotate, and since the structureis triangulated into a truss with diagonals, not a lot of rotation canever actually occur. This is one of those details that people can over-think.--------Oscar ZunigaMedford, ORAir Camper NX41CC "Scout"A75 powerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Gusset plywood grain orientation
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Pietenpol-List: Re: Gusset plywood grain orientation

Post by matronics »

Original Posted By: "taildrags"
To add just one more view point from a different perspective...There's not one joint in the structure that will care about the orientation ofthe gussets to well beyond design limits.At some point joints will fail. I've seen, inspected, dismantled and repairedALL of the joints associated with the landing gear attach points AFTER they hadall been ripped apart due to ground loops and hard landings. Even in thosewell beyond design limit incidences not ONE gusset failed. Even the ones thatwere very poorly glued and fitted. They ALL pushed the failure point outsideof their confines, which is to say at the point immediately outside of the gussetedarea, the naked longeron. Caveat, wood fuse, wood gear. Both epoxy and resorcinol.Furthermore, I've repaired a number of wing ribs damaged by wing tip contact withthe ground during a ground loop at high speed, again, not one gusset failure.Each failure was immediately adjacent, but outside, of the gusset. Similarfailure points had the gussets oriented both possible ways. In one rib, I discovereda couple joints were missing opposing gussets, and the failure stilloccurred outside the (one half) gusseted area.Even further furthermore, also repaired and inspected a broken horiz stab thathit the ground during a ground loop. The front spar broke very close to but outsideof the center gusset. It had a compression failure. The most clear exampleI've ever seen. The point is here, I believe the compression failure ismore of a elastic/plastic deformation issue, whereas many of the others verywell might have been in the brittle fracture domain, hit so hard so fast as tobasically just shatter. No matter the type of failure, the gussets seemed tohold regardless. As these were were beyond design limit failures, the forces coming at them werequite random, some aligned with where forces should come from, others not. Notone single gusset failed. As mentioned the quality of the joint matters more than gusset ply/grain orientation.Still, wouldn't try my hardest to go against the grain of common sense,but basically, it won't matter. But even in the quality of the joint, thereis forgiveness. Do your level best, have someone you trust mentor you to somedegree, and press on. In all of this, joints beyond the failures, many which I had to cut apart to getto a good point to scarf longerons, none showed any signs of any compromisewhat so ever. And they clearly had to take some high loads after the adjacentjoint failed. ToolsRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Gusset plywood grain orientation
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Pietenpol-List: Re: Gusset plywood grain orientation

Post by matronics »

Original Posted By: "tools"
Thanks, Tools, but I'll go one step further. I spent quite a bit of time repairing damage and upgrading things on 41CC after the nose-over incident when the landing gear broke a weld and collapsed in a precautionary landing. I saw damage in various places outside of gusseted areas and in one case, at a joint where there were no gussets. The vertical load of the fuel tank support straps on a fuselage crossmember that had triangular wedge 'buttresses' but no gussets pulled that member off the verticals by shearing at the glue line. You can see the crossmember that I'm talking about here: http://www.flysquirrel.net/piets/repairs/Image-10.JPG , and note that there were no gusset plates on those joints. Those joints were completely redone in the repairs.There were various other areas that needed attention, but NONE at a gusseted connection.--------Oscar ZunigaMedford, ORAir Camper NX41CC "Scout"A75 powerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Gusset plywood grain orientation
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Post by matronics »

Original Posted By: "Barry Davis"
One more thing... It's a good question! I always figured it should matter a lot,before I've seen what I've seen. Now I just worry about different but similarthings!Fixing broke off gear on a metal fuse plane now, whole new set of things that makeyou go HMMM?!ToolsRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
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RE: Pietenpol-List: Re: Gusset plywood grain orientation

Post by matronics »

Original Posted By: owner-pietenpol-list-server(at)matronics.com
When we built the Big Piets, we cut out about 5000 gussets at one time tobuild the 6 sets of wings. We forgot to sand the 4'x8' sheet of plywoodbefore we starting making our cuts, resulting in sanding all of the smallpieces of wood by hand. (It's been 7 years now, and my fingerprints havestill not grown back) ;-)Barry NX973BP-----Original Message-----
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Re: Pietenpol-List: Re: Gusset plywood grain orientation

Post by matronics »

Original Posted By: "Charles N. Campbell"
Hello everyone,thanks a lot for reply. I also ask my builder inspector for help. In this caseis difficult to find correct solution. Because the direction of forces and theirvalues are unknown. And that is important for correct vector analyse. Maybesome inspiration on another comparable wooden aircraft could be helpfull.PetrRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Tue, 26 Jan 2016 07:52:07 -0500Subject: Re: Pietenpol-List: Re: Gusset plywood grain orientation
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Pietenpol-List: Re: 2016 West Coast Piet Gathering

Post by matronics »

Original Posted By: "aerocarjake"
Hi pieters,Attached is the flier for the 2016 Left Coast Piet Gathering. Hope you folks canattend this great event.Cheers,--------Scott LiefeldFlying N11MS since March 1972Steel TubeC-85-12Wire WheelsBrodhead in 1996Read this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/west ... ___Subject: Pietenpol-List: Re: 2016 West Coast Piet Gathering
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Re: Pietenpol-List: Re: 2016 West Coast Piet Gathering

Post by matronics »

Original Posted By: vic groah
Sounds fun.... My Piet has a ways to go before I can fly down but I am lookingfwd to the day when I will....!!!!!--------Jake Schultz - curator,Newport Way Air Museum (OK, it's just my home)Read this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Wed, 27 Jan 2016 22:23:30 -0800Subject: Re: Pietenpol-List: Re: 2016 West Coast Piet Gathering
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Pietenpol-List: Re: 2016 West Coast Piet Gathering

Post by matronics »

Original Posted By: "aerocarjake"
Okay, I can't resist.Hey, it's Jake, from state farm. Enough of that. Like Vic says. You don't need your plane to attend. In fact ifyou come down I will take you up in mine provided that you can get in it. Ihave a door for the front seat and have taken some pretty big people up. itwould be great to be able to shake your hand.Think about it. It will be a great weekend. Some of us arrive on Friday.--------Scott LiefeldFlying N11MS since March 1972Steel TubeC-85-12Wire WheelsBrodhead in 1996Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: 2016 West Coast Piet Gathering
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Pietenpol-List: Re: 2016 West Coast Piet Gathering

Post by matronics »

Original Posted By: "aerocarjake"
Wearing black cargo pants (couldn't resist) Would be fun to drive down and meet you all - yet I may be in Wisconsin duringthat time in June...?!?!? Picked up a new 4amp battery for my Milwaukee M12 drill and a wood blank for mythrottle knob. "Doing something on the plane every day"--------Jake Schultz - curator,Newport Way Air Museum (OK, it's just my home)Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: 2016 West Coast Piet Gathering
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Pietenpol-List: Re: 2016 West Coast Piet Gathering

Post by matronics »

Original Posted By: "AircamperN11MS"
Wearing black cargo pants (couldn't resist) Would be fun to drive down and meet you all - yet I may be in Wisconsin duringthat time in June...?!?!? Picked up a new 4amp battery for my Milwaukee M12 drill and a wood blank for mythrottle knob. "Doing something on the plane every day"--------Jake Schultz - curator,Newport Way Air Museum (OK, it's just my home)Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: 2016 West Coast Piet Gathering
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Pietenpol-List: Re: 2016 West Coast Piet Gathering

Post by matronics »

Original Posted By: "aerocarjake"
I'm sure that if I had a round engine that you would be all over it. Keep us inmind should you find some free time.I do find myself in Chehalis about three times a year on business. In fact I"llbe there Feb, 8th and 9th. We fly into portland so I never make it up to whereyou are. Wish I could though.--------Scott LiefeldFlying N11MS since March 1972Steel TubeC-85-12Wire WheelsBrodhead in 1996Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: 2016 West Coast Piet Gathering
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