Original Posted By: "899PM"
Started in 1993 with a "project" plane - fuselage and wing onlyOne-piece wing Douwe's "old" Model A engine76 x 44 Hegy wood propExternal aileron cablesJenny gear18" spoke wheelsEverything all assembled, covered, painted, except:90% done, 90% to go Larry Morlock________________________________________________________________________________Subject: Pietenpol-List: Re: Destructive Testing
Pietenpol-List: Re: Destructive Testing
Original Posted By: Michael Groah
When I first started building, I was intrigued with Charlie Rubeck's Western RedCedar ribs. At Brodhead '98 Charlie convinced me to build one and test it. Ibuilt a test fixture utilizing engineering grade compression springs of knownrate. I pulled the loading spacing out of an old NACA document. I still havethe fixture. If memory serves, I tested a single WRC rib mounted on stub sparsto 267 pounds before I heard a crack somewhere. Never did find the crack. I canload a rib in the fixture and take a pic if anyone is interested? If in doubt about the strength of the Piet ribs, start looking at some of the ribsthat certified aircraft have used in the past. I have a Porterfield CP-65rib that is under 1/4" square stock. It scares me to just look at it.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Thu, 19 Apr 2012 08:57:57 -0700 (PDT)
When I first started building, I was intrigued with Charlie Rubeck's Western RedCedar ribs. At Brodhead '98 Charlie convinced me to build one and test it. Ibuilt a test fixture utilizing engineering grade compression springs of knownrate. I pulled the loading spacing out of an old NACA document. I still havethe fixture. If memory serves, I tested a single WRC rib mounted on stub sparsto 267 pounds before I heard a crack somewhere. Never did find the crack. I canload a rib in the fixture and take a pic if anyone is interested? If in doubt about the strength of the Piet ribs, start looking at some of the ribsthat certified aircraft have used in the past. I have a Porterfield CP-65rib that is under 1/4" square stock. It scares me to just look at it.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Thu, 19 Apr 2012 08:57:57 -0700 (PDT)
RE: Pietenpol-List: Re: Destructive Testing
Original Posted By: owner-pietenpol-list-server(at)matronics.com
My concern is that this type of conversation will lead to improper testmethods, and useless info. Imagine if a number of NEW builders decided thatthere must be some concern about rib strength, just because of these posts,that causes them to start sand bagging their ribs. Suddenly, numbers startcoming in....the normal reaction is going to be that, if my rib crushes at alesser weight than yours, then mine must be substandard; a completelyincorrect conclusion since the testing methods must be correct - and thereare proper testing methods. Not speaking to you, directly, Mike, but to everyone else: Forget abouttesting the rib design! YOU DON'T KNOW HOW! Just follow the previous goodpractices, as stated by Ryan M, and others, and test your first glue joints(if you have never worked with wood before), and trust empirical evidence.Gary BootheNX308MB-----Original Message-----
My concern is that this type of conversation will lead to improper testmethods, and useless info. Imagine if a number of NEW builders decided thatthere must be some concern about rib strength, just because of these posts,that causes them to start sand bagging their ribs. Suddenly, numbers startcoming in....the normal reaction is going to be that, if my rib crushes at alesser weight than yours, then mine must be substandard; a completelyincorrect conclusion since the testing methods must be correct - and thereare proper testing methods. Not speaking to you, directly, Mike, but to everyone else: Forget abouttesting the rib design! YOU DON'T KNOW HOW! Just follow the previous goodpractices, as stated by Ryan M, and others, and test your first glue joints(if you have never worked with wood before), and trust empirical evidence.Gary BootheNX308MB-----Original Message-----
Re: Pietenpol-List: put your cards on the table Gents and Ladies!
Original Posted By: Andrew Eldredge
Subject: Re: Pietenpol-List: put your cards on the table Gents and Ladies!
Subject: Re: Pietenpol-List: put your cards on the table Gents and Ladies!
Pietenpol-List: Re: put your cards on the table Gents and Ladies!
Original Posted By: "tools"
Gary,I agree.I am a Mfg Engineer by trade and have as much fun building fixtures as I do theactual projects. The heated forum discussions of the "inferior" Western Red Cedarribs nearly 15 years ago intrigued me enough to build the test fixture toconvince myself that WRC was indeed a perfectly acceptable wood for Piet ribs.I am sure there are plenty of Charlies rib sets in flying Piets today. The Pietrib as designed, is built like the proverbial brick sh%$ house. Zero reasonto change it.Just bought a 500' spool of 7x19 aircraft cable of E-Bay. Was disappointed as hellto see the big "MADE IN CHINA" label on the spool when it arrived. The engineerin me again kicked into high gear. I made up 3 nico'd cable assemblies lastnight to pull to destruction on certified load cells tomorrow. If it breakswithin 10% of rated load.....I'm ok with it. Done deal.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: put your cards on the table Gents and Ladies!
Gary,I agree.I am a Mfg Engineer by trade and have as much fun building fixtures as I do theactual projects. The heated forum discussions of the "inferior" Western Red Cedarribs nearly 15 years ago intrigued me enough to build the test fixture toconvince myself that WRC was indeed a perfectly acceptable wood for Piet ribs.I am sure there are plenty of Charlies rib sets in flying Piets today. The Pietrib as designed, is built like the proverbial brick sh%$ house. Zero reasonto change it.Just bought a 500' spool of 7x19 aircraft cable of E-Bay. Was disappointed as hellto see the big "MADE IN CHINA" label on the spool when it arrived. The engineerin me again kicked into high gear. I made up 3 nico'd cable assemblies lastnight to pull to destruction on certified load cells tomorrow. If it breakswithin 10% of rated load.....I'm ok with it. Done deal.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: put your cards on the table Gents and Ladies!
Pietenpol-List: Re: put your cards on the table Gents and Ladies!
Original Posted By: "aerocarjake"
Mike Danford, Chickamauga GA (Chattanooga TN area), 423 580 1383.Bought plans from Mr Pietenpol around 96. Got some supplemental drawings directlyfrom Orrin Hoopman.I've not made a lot of progress! Mostly because I was never around any aviationtypes (light civil or homebuilders) and could never come to a conclusion onhow to do this or that.However, that's all getting fixed right now. My intentions are:All wood, short fuse, wood gear, make my own prop, rebuild a Model A myself, woodstruts all around, probably no brakes or tailwheel, build my own wheel hubs.Really want a basic plane.However, I bought Dick Navratil's NX2RN and have come to the conclusion a reliableA-65 is good. ANYTHING lighter is gooder (considering a steel fuse). A steerabletailwheel and simple brakes worth the weight.I'm near Chattanooga TN and have the following available to local builders shouldthey need it.Completely equipped wood shop, I can basically turn a tree into dimensioned lumber.If you have some wood you need milled into wing rib material, spars (dimensioning,routing) worked on, longeron milling from larger stock, etc, I canhelp. Leading edge and trailing edge shaping.I have a complete machine shop. Several lathes, mills, shapers, grinders (surface,tool and cutter, run of the mill). All sorts of drilling and boring capability.My larger lathe has a 1 1/2" headstock bore so I can work on axles.Lots of welding capability, oxy/acet (std victor torch and a Henrob), MIG and TIG.I'm JUST finally figuring out how to weld decently... you're mostly on yourown here, but welcome to come use the stuff.I also have a decent selection of things to lift things with. I can lift wingsonto planes, engines, etc. I'm close enough to several private fields that wecan trailer a mini excavator to one of them to assemble a plane if you needhelp with that.I've got a number of large cast iron workbenches (about 8 ft, dead flat) that aregreat for scarfing together spars, laminating struts, ect.If anyone's willing to travel, you're welcome to come use what you need. Alwaysa room available as well. Beer and food supplied as needed!The catch is that I'm not here a lot, but someone usually is.ToolsRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: put your cards on the table Gents and Ladies!
Mike Danford, Chickamauga GA (Chattanooga TN area), 423 580 1383.Bought plans from Mr Pietenpol around 96. Got some supplemental drawings directlyfrom Orrin Hoopman.I've not made a lot of progress! Mostly because I was never around any aviationtypes (light civil or homebuilders) and could never come to a conclusion onhow to do this or that.However, that's all getting fixed right now. My intentions are:All wood, short fuse, wood gear, make my own prop, rebuild a Model A myself, woodstruts all around, probably no brakes or tailwheel, build my own wheel hubs.Really want a basic plane.However, I bought Dick Navratil's NX2RN and have come to the conclusion a reliableA-65 is good. ANYTHING lighter is gooder (considering a steel fuse). A steerabletailwheel and simple brakes worth the weight.I'm near Chattanooga TN and have the following available to local builders shouldthey need it.Completely equipped wood shop, I can basically turn a tree into dimensioned lumber.If you have some wood you need milled into wing rib material, spars (dimensioning,routing) worked on, longeron milling from larger stock, etc, I canhelp. Leading edge and trailing edge shaping.I have a complete machine shop. Several lathes, mills, shapers, grinders (surface,tool and cutter, run of the mill). All sorts of drilling and boring capability.My larger lathe has a 1 1/2" headstock bore so I can work on axles.Lots of welding capability, oxy/acet (std victor torch and a Henrob), MIG and TIG.I'm JUST finally figuring out how to weld decently... you're mostly on yourown here, but welcome to come use the stuff.I also have a decent selection of things to lift things with. I can lift wingsonto planes, engines, etc. I'm close enough to several private fields that wecan trailer a mini excavator to one of them to assemble a plane if you needhelp with that.I've got a number of large cast iron workbenches (about 8 ft, dead flat) that aregreat for scarfing together spars, laminating struts, ect.If anyone's willing to travel, you're welcome to come use what you need. Alwaysa room available as well. Beer and food supplied as needed!The catch is that I'm not here a lot, but someone usually is.ToolsRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: put your cards on the table Gents and Ladies!
Pietenpol-List: Re: Destructive Testing
Original Posted By: "womenfly2"
Plans ordered from Don Pietenpol June 2004.First wood cut November 2005.Using Sitka Spruce throughout - purchased as rough sawn planks.Built parts (to date):Ribs done. Standard Pietenpol FC-10 airfoil.Empennage done.Long fuselage 80% done. 1" longer than plans, 1" taller than plans, standard width.Control horns 90% done.Continental C-75-12Intentions (but not built yet):3-pc wing with UK-style built-up spars"Jenny" gear + tall skinny wheels + mechanical brakesTailwheelNosewheel... :)Paint scheme: yes, it will have oneGoal to have in the air before Christmas. Just not sure which one.Bill C.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Destructive Testing
Plans ordered from Don Pietenpol June 2004.First wood cut November 2005.Using Sitka Spruce throughout - purchased as rough sawn planks.Built parts (to date):Ribs done. Standard Pietenpol FC-10 airfoil.Empennage done.Long fuselage 80% done. 1" longer than plans, 1" taller than plans, standard width.Control horns 90% done.Continental C-75-12Intentions (but not built yet):3-pc wing with UK-style built-up spars"Jenny" gear + tall skinny wheels + mechanical brakesTailwheelNosewheel... :)Paint scheme: yes, it will have oneGoal to have in the air before Christmas. Just not sure which one.Bill C.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Destructive Testing