Pietenpol-List: Wheel hubs

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Pietenpol-List: Wheel hubs

Post by matronics »

Original Posted By: "carson"
Ken,-I can't see those two bolts moving once they are torqued tight. -Dan HelsperPoplar Grove, IL.Looking for simple solutions to your real-life financial cha540686/aol?redir=http://www.walletpop.com/?NCID=emlcntuswall00000001" hrr=http://www.walletpop.com/?NCID=emlcntuswall00000001" target="_blank">Check out WalletPop for the latest news and information, tips and calculators.=0A=0A=0A ________________________________________________________________________________Subject: Pietenpol-List: Wheel hubs
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Re: Pietenpol-List: Cabane brackets

Post by matronics »

Original Posted By: HelsperSew(at)aol.com
Ken, I can't see those two bolts moving once they are torqued tight. Dan Helsper Poplar Grove, IL.---------------------------------------------------------------------- Looking for simple solutions to your real-life financial cha540686/aol?redir=http://www.walletpop.com/?NCID=emlcntuswall00000001" hrr=http://www.walletpop.com/?NCID=emlcntuswall00000001" target="_blank">Check out WalletPop for the latest news and information, tips and calculators.3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D------------------------------------------------------------------------------ Checked by AVG - http://www.avg.com 9/28/2008 1:30 PM________________________________________________________________________________
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Re: Pietenpol-List: Cabane brackets

Post by matronics »

Original Posted By: HelsperSew(at)aol.com
Ken,-I can't see those two bolts moving once they are torqued tight. -Dan HelsperPoplar Grove, IL.Looking for simple solutions to your real-life financial cha540686/aol?redir=http://www.walletpop.com/?NCID=emlcntuswall00000001" hrr=http://www.walletpop.com/?NCID=emlcntuswall00000001" target="_blank">Check out WalletPop for the latest news and information, tips and calculators.3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3Dhref='3D"http://www.matronics.com/Navigator?Piet ... =3D=3D=3D- - Release Date: 9/28/2008 1:30 PM=0A=0A=0A ________________________________________________________________________________
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Re: Pietenpol-List: Cabane brackets

Post by matronics »

Original Posted By: KMHeide, BA, CPO, FAAOP
Appearance is deceiving. The engineering isn't.A bolt's shear strength is approximately 60% ofit's tensile strength.-The AN bolts we use have a tensile strength of125,000 lb per square inch. A 3/16" AN-3 boltcross section is 0.0277 sq inches. so eachshear point is capable of supporting 3468 lb.There are two brackets per cabane. Not anychance of the bolts shearing-The wood shear strength is a little different atthis juncture as one bolt is in end shear and theother is "shear across the grain".-Across the grain. in the longeron, the "tensileperpendicular to the grain" is 360 lb per square inch.The chart doesn't give an actual shear numberunfortunately.-Parallel to the grain, in the upright cross memberit's 1120 lb per sq inch.-Also you are going through two layers of 1/8" hardwood ply.-There are at least a couple of Piets with woodcabanes and mine does too. Consider thestrength of that cabane joint with one bolt throughit. A bolt in this configuration will pull a plug ofwood out equal to the width of the bolt. This meanswe have two "faces" where shear is working.-If the bolt is 1" away from the end and the wood is1" wide then we have two 1" sqare faces, eachwith a strength of 1120 lb or 2240 lb in total.-So how much force-is each cabane going to see?-Consider a Piet with four cabanes and a maxload of 1200 lb. Now we have to consider howmuch of the total load is seen by the cabanes.Remember, the struts take most of the load asthey are just outboard of the halfway point oneach panel. Also the upward force distribution isparabolic, the closer you get to the tip the lessthe wing supports. We have an unequal seesawwith some upward load on the cabanes and moston the outer struts.-The area between the strut connection and the cabane sees about 65% of the wing load. Sothere's a difference of 20%. That's what thecabanes support. On our example that's 20% of1200 lb or 240 lb distributed among four cabanes.-If they all supported equally then each supports60 lb. They don't.The front takes more but thatcan't be more than 70 lb. -Multiply that estimated 70 lb by your choice ofG factor, say 4G, and that strut sees 280 lb.Even if we were to factor in "bounce off the seat"gust loads that single bolt isn't going to see loadsanywhere near 2240 lb.-Just for the sake of my own irrational fears I'vemade that joint with three bolts 1" away fromeach other. :-)-So applying the above to the fuselage bolts itbecomes evident, just by eyeball, that any fearsof failure are ungrounded.-If that isn't enough to convince then consider thevenerable and long lived DC-3, with a-pair of-1/2"bolts in the landing gear knee.-Of course all I've done is support the fact thatdamn near every Piet ever flown was built withthose two bolts in the fuselage. Right?- :-)-Clif-"The greatest deception men suffer is from their own opinions." (Leonardo da Vinci)-------------------------- Original Message -----
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Pietenpol-List: Re: Cabane Brackets

Post by matronics »

Original Posted By: "Bill Church"
>Oscar and others.........>>Sorry If I was not very clear...>>I am talking about the twobolts that pass thru the inside and>outside steel brackets attached to the wooden upright on the fuse.>Did anyone sleeve the holes through the wood to prevent longation or>movement? Make sense yet?....>>>Kenneth M. Heide, BA, CPO, FAAOP >>> ________________________________________________________________________________Subject: Pietenpol-List: Re: Cabane Brackets
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Post by matronics »

Original Posted By: johnwoods(at)westnet.com.au
Hi AllDoes anyone have drawings of the hubs for the wire wheels that I may get a copyof?Or are they in the plans somewhere that I have missed?Thanks in advanceCarsonRead this topic online here:http://forums.matronics.com/viewtopic.php?p 6837#206837________________________________________________________________________________
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RE: Pietenpol-List: Cabane brackets

Post by matronics »

Original Posted By: kmheidecpo(at)yahoo.com
Ken,If you are willing to deviate from the norm and follow some practicesused in other parts of the world then you might want to look at usingbushings made from a product called Tufnol Carp. Some of us here inAustralia are using this product to provide a harder bearing surfacewhere the bolts penetrate the longerons and spars. An idea used bythe British and required by their LAA (formerly PFA).The source we found is in the UK at the following link.http://stores.ebay.co.uk/Fantastic-Plas ... Z2QQtZkmwe used 8mm rod for the logerons and 12mm for the spars.Drill and ream to suit the bolt.For what it's worth.JohnW---- Original Message ----
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Pietenpol-List: Re: Wheel hubs

Post by matronics »

Original Posted By: "Bill Church"
Ken,I'm just going to go from memory here, but, unless my memory is completely shot,each cabane strut, under normal loading, only carries about 50 pounds of load.Those bolts holding the cabanes will be nowhere near their limits. The smallerholes drilled in the wood, the better.I'd just go with the plans on this one. Don't recall anyone having problems withthis area.Bill C.Read this topic online here:http://forums.matronics.com/viewtopic.php?p 6848#206848________________________________________________________________________________Subject: Pietenpol-List: Re: Wheel hubs
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Post by matronics »

Original Posted By: "Clif Dawson"
Carson,It isn't a drawing, but it is an article that describes how to make them:http://www.mykitplane.com/Planes/filesL ... mID=56Bill C.Read this topic online here:http://forums.matronics.com/viewtopic.php?p 6850#206850________________________________________________________________________________
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Re: Pietenpol-List: Cabane brackets

Post by matronics »

Original Posted By: KMHeide, BA, CPO, FAAOP
Appearance is deceiving. The engineering isn't.A bolt's shear strength is approximately 60% ofit's tensile strength.The AN bolts we use have a tensile strength of125,000 lb per square inch. A 3/16" AN-3 boltcross section is 0.0277 sq inches. so eachshear point is capable of supporting 3468 lb.There are two brackets per cabane. Not anychance of the bolts shearingThe wood shear strength is a little different atthis juncture as one bolt is in end shear and theother is "shear across the grain".Across the grain. in the longeron, the "tensileperpendicular to the grain" is 360 lb per square inch.The chart doesn't give an actual shear numberunfortunately.Parallel to the grain, in the upright cross memberit's 1120 lb per sq inch.Also you are going through two layers of 1/8" hardwood ply.There are at least a couple of Piets with woodcabanes and mine does too. Consider thestrength of that cabane joint with one bolt throughit. A bolt in this configuration will pull a plug ofwood out equal to the width of the bolt. This meanswe have two "faces" where shear is working.If the bolt is 1" away from the end and the wood is1" wide then we have two 1" sqare faces, eachwith a strength of 1120 lb or 2240 lb in total.So how much force is each cabane going to see?Consider a Piet with four cabanes and a maxload of 1200 lb. Now we have to consider howmuch of the total load is seen by the cabanes.Remember, the struts take most of the load asthey are just outboard of the halfway point oneach panel. Also the upward force distribution isparabolic, the closer you get to the tip the lessthe wing supports. We have an unequal seesawwith some upward load on the cabanes and moston the outer struts.The area between the strut connection and the cabane sees about 65% of the wing load. Sothere's a difference of 20%. That's what thecabanes support. On our example that's 20% of1200 lb or 240 lb distributed among four cabanes.If they all supported equally then each supports60 lb. They don't.The front takes more but thatcan't be more than 70 lb. Multiply that estimated 70 lb by your choice ofG factor, say 4G, and that strut sees 280 lb.Even if we were to factor in "bounce off the seat"gust loads that single bolt isn't going to see loadsanywhere near 2240 lb.Just for the sake of my own irrational fears I'vemade that joint with three bolts 1" away fromeach other. :-)So applying the above to the fuselage bolts itbecomes evident, just by eyeball, that any fearsof failure are ungrounded.If that isn't enough to convince then consider thevenerable and long lived DC-3, with a pair of 1/2"bolts in the landing gear knee.Of course all I've done is support the fact thatdamn near every Piet ever flown was built withthose two bolts in the fuselage. Right? :-)Clif"The greatest deception men suffer is from their own opinions." (Leonardo da Vinci) ----- Original Message -----
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Re: Pietenpol-List: Wheel hubs

Post by matronics »

Original Posted By: Oscar Zuniga
Subject: Re: Pietenpol-List: Wheel hubsCarson,Go to westcoastpiet.com and look at the photos under Santiago Morete. He has photos and drawings there. Dan HelsperPoplar Grove, IL.**************Looking for simple solutions to your real-life financial challenges? Check out WalletPop for the latest news and information, tips andcalculators. (http://www.walletpop.com/?NCID=emlcntuswall00000001)________________________________________________________________________________
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Pietenpol-List: Re: Wheel hubs

Post by matronics »

Original Posted By: "carson"
Gene;When I made my first solo x-c in a Cessna 150/150 "Texas Taildragger" many moonsago, the first leg was from Laredo International to Uvalde, just over the required100NM distance for the leg. I was shaking when I got out of the airplaneto have the FBO attendant sign my logbook. Believe me, there isn't much tosee in those 100NM of deep south Texas brush country and there was even lessto see 27 years ago. Although I hadn't gotten lost or had any problems, it wasquite a thing to be out on my own. I navigated there using the ADF and hadno problems.My second leg was from Uvalde to Cotulla, TX... another very friendly place, incase you find yourself there. I took my Private Pilot written exam sitting inthe FSS at Cotulla over 40 years ago. The weather specialist administered theexam and watched me out of the corner of his eye ;o) I have flown in and fueled41CC a couple of times in Cotulla since I've had the airplane.Oscar ZunigaAir Camper NX41CCSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________Subject: Pietenpol-List: Re: Wheel hubs
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Post by matronics »

Original Posted By: "KMHeide, BA, CPO, FAAOP"
Thanks For the info I think I will have a crack at them now.On another note Dan where did you get your brake drum if that's what it is called.Iwas going to start another post to ask if anyone knew but you would be thebest to ask.Thanks carsonRead this topic online here:http://forums.matronics.com/viewtopic.php?p 6887#206887________________________________________________________________________________Date: Tue, 30 Sep 2008 06:02:31 -0700 (PDT)
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Re: Pietenpol-List: Re: Wheel hubs

Post by matronics »

Original Posted By: "Bill Church"
Subject: Re: Pietenpol-List: Re: Wheel hubsCarson,Those documents/drawings under the name of Santiago Morete are actually authored by me. I was trying to help him do the same thing you want to do. I hadalready gone through this whole process so I sent him all this info. I would recommend studying Santiago's photos because he improved on my ideas. In answer to your question about the drums, I went into great detail with Santiagoon this, that is why I am directing you to look at the documents/drawings that he has posted under his name at westcoastpiet.com. After you study all that, feel free to ask me additional questions. Dan HelsperPoplar Grove, IL.**************Looking for simple solutions to your real-life financial challenges? Check out WalletPop for the latest news and information, tips andcalculators. (http://www.walletpop.com/?NCID=emlcntuswall00000001)________________________________________________________________________________
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RE: Pietenpol-List: Re: Wheel hubs

Post by matronics »

Original Posted By: owner-pietenpol-list-server(at)matronics.com
I have tried on several occasions to open those documents onwestcoastpiet.com, and have never been successful.I get the first one to open, but not either of the other two. Anyone elsehave this same problem, or is it just me?Bill C. _____
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Re: Pietenpol-List: Re: Wheel hubs

Post by matronics »

Original Posted By: "Ryan Mueller"
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Re: Pietenpol-List: Re: Wheel hubs

Post by matronics »

Original Posted By: "Gary Boothe"
Subject: Re: Pietenpol-List: Re: Wheel hubsBill,Those files open fine for me. Dan HelsperPoplar Grove, IL.**************Looking for simple solutions to your real-life financial challenges? Check out WalletPop for the latest news and information, tips andcalculators. (http://www.walletpop.com/?NCID=emlcntuswall00000001)________________________________________________________________________________
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RE: Pietenpol-List: Re: Wheel hubs

Post by matronics »

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Bill,Those all appear to be Word Docs, although the last two are drawings. Theyopened OK for me.Gary BootheCool, Ca.PietenpolWW Corvair ConversionTail done, working on fuselage(11 ribs down.) _____
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Pietenpol-List: Re: Wheel hubs

Post by matronics »

Original Posted By: "carson"
Still no luck.I don't know. Must be my computer.I'll try on a different machine.Thanks, guys.________________________________________________________________________________Subject: Pietenpol-List: Re: Wheel hubs
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Post by matronics »

Original Posted By: Ben Charvet
Thanks DanI have read it again this morning,You made them yourself thats why I cant findthem anywhere to buy.I had no trouble opening the files.Thanks againCarsonRead this topic online here:http://forums.matronics.com/viewtopic.php?p 6953#206953________________________________________________________________________________Date: Tue, 30 Sep 2008 21:33:18 -0400
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