Original Posted By: "tkreiner"
Matt, Tim in TX, et al,Forgot to mention, the Okume and Birch Ply carried by Clarke's Hardwoods, are MarineGrade, with waterproof, boilproof adhesives.TK--------Tom KreinerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Rib Truss design, ala 1940
Pietenpol-List: Rib Truss design, ala 1940
Re: Pietenpol-List: Rib Truss design, ala 1940
Original Posted By: Ryan Mueller
Since the topics of Gussets, wedges, etcs. have been bouncing around for a while,I thought it might be interesting to see how ribs were designed in the '30'sand '40's. My source for the information presented below is from Chapter 1(Aircraft Woodwork), page 7, of Brimm & Boggess' 1940 publication "Aircraft Maintenance."This chapter illustrates - both verbally and with lots of illustrations - how ribswere originally made. According to the authors, the centerlines of the varioustruss elements in a rib were to intersect at a common point; that pointbeing the centerline of the cap strip. That said, they give no explanation, butit's almost intuitive that the overall joint will be stronger, due to a significantlylarger glue joint. Since I've designed - along with Harry Riblett himself - a Piet rib using the GA30-613.5airfoil, I've incorporated this design technique in the design. Theentire rib, leading edge items, etc., have been modeled using SolidWorks. AlthoughFEA analysis could be used to determine the strength, and/or load factorof the wing, I don't believe that's necessary, as this wing, using the originalPiet airfoil, has flown 80+ years. The only change I've made is the use ofa lower drag, lower pitching moment shape. (OK, OK, I know some of you willflame me... I'm really NOT a heretic, just looking for a tiny improvement...)In the accompanying jpeg, you'll see how the centerlines of all elements intersect.If you're able to find a copy, this book show many valuable techniques, just asSportplane Construction Techniques does. I've seen them on eBay for around$30.TK--------Tom KreinerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/rib_ ... ______Date: Mon, 7 Sep 2009 22:44:47 -0500Subject: Re: Pietenpol-List: Rib Truss design, ala 1940
Since the topics of Gussets, wedges, etcs. have been bouncing around for a while,I thought it might be interesting to see how ribs were designed in the '30'sand '40's. My source for the information presented below is from Chapter 1(Aircraft Woodwork), page 7, of Brimm & Boggess' 1940 publication "Aircraft Maintenance."This chapter illustrates - both verbally and with lots of illustrations - how ribswere originally made. According to the authors, the centerlines of the varioustruss elements in a rib were to intersect at a common point; that pointbeing the centerline of the cap strip. That said, they give no explanation, butit's almost intuitive that the overall joint will be stronger, due to a significantlylarger glue joint. Since I've designed - along with Harry Riblett himself - a Piet rib using the GA30-613.5airfoil, I've incorporated this design technique in the design. Theentire rib, leading edge items, etc., have been modeled using SolidWorks. AlthoughFEA analysis could be used to determine the strength, and/or load factorof the wing, I don't believe that's necessary, as this wing, using the originalPiet airfoil, has flown 80+ years. The only change I've made is the use ofa lower drag, lower pitching moment shape. (OK, OK, I know some of you willflame me... I'm really NOT a heretic, just looking for a tiny improvement...)In the accompanying jpeg, you'll see how the centerlines of all elements intersect.If you're able to find a copy, this book show many valuable techniques, just asSportplane Construction Techniques does. I've seen them on eBay for around$30.TK--------Tom KreinerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/rib_ ... ______Date: Mon, 7 Sep 2009 22:44:47 -0500Subject: Re: Pietenpol-List: Rib Truss design, ala 1940
RE: Pietenpol-List: Rib Truss design, ala 1940
Original Posted By: "Bill Church"
Pietenpol-List: Re: Rib Truss design, ala 1940
Original Posted By: "tkreiner"
Here is a shot of my finished panel. The extremely figured Birdseye maple is somethat I have been holding onto for over 20 years. Making engine noises is evenmore fun now.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/img_ ... ___Subject: Pietenpol-List: Re: Rib Truss design, ala 1940
Here is a shot of my finished panel. The extremely figured Birdseye maple is somethat I have been holding onto for over 20 years. Making engine noises is evenmore fun now.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/img_ ... ___Subject: Pietenpol-List: Re: Rib Truss design, ala 1940
Original Posted By: Jim Markle
Bill C.Although I'm laying out an airfoil so we can build NC rib jigs, and other tooling,the positions of the various truss members has not changed. There will beno other mods to the wing members, such as drag, anti-drag wires, etc.TK--------Tom KreinerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Tue, 8 Sep 2009 12:39:56 -0400 (GMT-04:00)
Bill C.Although I'm laying out an airfoil so we can build NC rib jigs, and other tooling,the positions of the various truss members has not changed. There will beno other mods to the wing members, such as drag, anti-drag wires, etc.TK--------Tom KreinerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Tue, 8 Sep 2009 12:39:56 -0400 (GMT-04:00)
RE: Pietenpol-List: Re: Rib Truss design, ala 1940
Original Posted By: "Bill Church"
Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Original Posted By: Matt Redmond
Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Original Posted By: Matt Redmond
Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Original Posted By: Matt Redmond
Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Pietenpol-List: Re: Rib Truss design, ala 1940
Original Posted By: "Pieti Lowell"
Either that or Chris is groveling around on the floor.Just how big is this dog anyway?Clif> > So Gary,> Are you just going to take that?> I think Chris just said you have dog's breath.>>> Gary> I thought I felt you breathing down my neck but it was just the dog.> Chris________________________________________________________________________________Subject: Pietenpol-List: Re: Rib Truss design, ala 1940
Either that or Chris is groveling around on the floor.Just how big is this dog anyway?Clif> > So Gary,> Are you just going to take that?> I think Chris just said you have dog's breath.>>> Gary> I thought I felt you breathing down my neck but it was just the dog.> Chris________________________________________________________________________________Subject: Pietenpol-List: Re: Rib Truss design, ala 1940
Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Original Posted By: Robert Ray
Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940
> Re: Pietenpol-List: Re: Rib Truss design, ala 1940
Original Posted By:> mdredmond(at)gmail.com
> Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940
> Subject: Re: Pietenpol-List: Re: Rib Truss design, ala 1940