Re: Pietenpol-List: Re: Slow list day.........Bernerd, and his ideas

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Pietenpol-List: you make your choices---you take your chances

Post by matronics »

Original Posted By: Michael Perez
SPACE CORP]" Mike-- I'm not here to debate the stresses of the spreader bars vs. the rudder bar, all I am saying is that with such a PRIMARY control you should reconsider using non-4130 grade tubing for your rudder bar but hey....that's the beauty of homebuilding---you can use whatever you want...just count me out as ever being your test pilot or passenger.- Period.---As long as YOU feel comfortable with your choices then YOU can do the test flying. Mike C. NX48MCle, List Admin.________________________________________________________________________________Date: Wed, 2 Mar 2011 05:52:21 -0800 (PST)
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Re: Pietenpol-List: Re: Slow list day.........Bernerd, and his ideas

Post by matronics »

Original Posted By: helspersew(at)aol.com
Subject: RE: Pietenpol-List: Re: Rudder bar and forward controlsI think Billy made a great point in addition to Bill Church is that you're cheapingout on somethingthat is a critical flight control that 'may' work fine for years and years butthen again may not. Remember Mike....my spreader bars were made of stainless and last summer the oneear of my front rudderbar snapped off and dragged under the airplane after landing at a nearby fly-in.Scary ? You bet but thankfully there are TWO spreader bars and the other one heldup to get me home safely. In the Pietenpol you only have one rudder bar so you're probably right---it willbe fine and I'm glad youare confident that it will be okay but in the grand scheme of things it isn't worthtaking a chance when fora few bucks you could have aircraft grade 4130 in there. I'd hate to be turning base to final with my wife or loved one in the front seatand have something like my rudder control fail 80 feet over the tall trees with no chance of recovery anda nice tank of fuel ready to splitand catch fire as it flows over those hot exhaust pipes....I guess that's why we are required to display a placard in full view of the passengerwhich says that "this airplaneis amateur built and does not comply with the same standards that factory builtairplanes are required to comply with."(paraphrased)Mike C.________________________________________________________________________________Subject: Re: Pietenpol-List: Re: Slow list day.........Bernerd, and his ideas
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Post by matronics »

Original Posted By: DOMIT
I think some of the reason many of us choose this design, is a longing for simpler times, and the ability to maybe travel back in history and stay there for a few precious moments. We fantasize about how it must have been, and (mistaking) use the "green grass" theory to imagine that it was a better place. We define in our minds the things that were going on, to a definite day or year, and don't want to inconvenience ourselves to recognize that time never stands still............ Please leave me alone in my fantasies!!! I want to stay here!!!Dan HelsperPoplar Grove, IL.-----Original Message-----
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Re: Pietenpol-List: Re: Slow list day.........Bernerd, and his ideas

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Original Posted By: Rick Holland
Subject: Re: Pietenpol-List: Re: Slow list day.........Bernerd, and his ideas
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Post by matronics »

Original Posted By: Michael Perez
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Re: Pietenpol-List: Slow list day.........How about this idea?

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Original Posted By: Earnest Bunbury
Subject: Re: Pietenpol-List: Slow list day.........How about this idea?
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Pietenpol-List: Re: Rudder bar and forward controls

Post by matronics »

Original Posted By: "Cuy, Michael D. (GRC-RXD0)[ASRC AEROSPACE CORP]"
Hoo-boy, what a response.Michael (as opposed to Mike), your argument is way off base. The spreader barsare NOT under a great deal of stress. The cross brace cables should only haveenough tension in them to take up the slack. And in the straight axle gear, theaxle essentially floats above the gear, attached by bungees. The point is thatthe straight axle doesn't impose side loads like the split gear would, therefore,even in a rough landing, there will not be extreme forces transmitted tothe spreader bars. Nonetheless, as Mike related, his stainless steel spreadersdid fail. The rudder bar, however CAN and WILL be exposed to considerable forcesexerted by the pilot. Have you ever had to stop a vehicle suddenly, andfind yourself pressing the brake pedal with all your strength? Pressing the pedalharder after the brakes have locked will do no good, yet that is what we do,as humans. In a moment of panic, the rudder bar will very likely be exposedto forces far greater than it should see under "normal" conditions. There aresome metal parts on the Pietenpol that can safely be replaced by stainless steel,but unless the wall thickness and/or O.D. is increased appropriately, therudder bar isn't one. As I pointed out earlier, this is one of the few itemsthat specifically call for cro-moly. If the plans had called for 1020 steel, thenst.st. would provide a similar strength, but compared to 4130, st.st. is onlyhalf as strong.I realize that you are building YOUR plane, and doing it the way YOU want, andthat's your prerogative. The only reason I'm bothering to respond is for the benefitof other builders out there who might be misled by your latest post.I've said my bit, and I'll now bow out of this discussion. Feel free to build asyou please. We're only trying to give you a hand, but if you don't want to listen,that's your choice.Bill C.Read this topic online here:http://forums.matronics.com/viewtopic.p ... __________
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Pietenpol-List: Re: Slow list day.........How about this idea?

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Original Posted By: "Brett Phillips"
Subject: Pietenpol-List: what to use and what to fly with comfortably--an ongoingdiscussion There have been many accounts by very highly educated people of why or why notwe might prefer to use various metals and aircraft grade (which are READILY available)hardware or not on a plans-built homebuilt design but I herewith withdraw my desireto test fly the gorgeously-built airplane by Michael Perez. I think ifYOU feel comfortablewith all the changes you have made in the airplane and bill of materials that youin fact should be the test pilot and I will be there at Columbia Airport cheeringyou on andbeing one of the very first to congratulate you on your first test flight but willtake no part in flying off the test time nor ever get into your airplane forany subsequent rides orflights thereafter. The plans built airplane is to the utmost the MOST experimentalplane in the air today in the United States of America and thank GODwe don't have to gothru the rigors of the PFA or the mess that the other countries prescribe theygo thru just to change a nut or bolt here and there. Happy flying to all andto all a Good Night !Mike C. Ohio________________________________________________________________________________Subject: Pietenpol-List: Re: Slow list day.........How about this idea?
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Post by matronics »

Original Posted By: "Jack Phillips"
Dan: Would you be interested in selling your side mounted magneto setup? I might beinterested if it is available. I've followed your troubles on the list, and Ithink the gear driven mag could be made to be very reliable with careful setupof gear mesh. I would be concerned that a standby ignition system that is turnedoff most of the time would suffer from fouled plugs.Brett PhillipsStrasburg, VANX311GPRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
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Pietenpol-List: Re: Rudder bar and forward controls

Post by matronics »

Original Posted By: "Billy McCaskill"
Subject: Pietenpol-List: you make your choices---you take your chancesMike-- I'm not here to debate the stresses of the spreader bars vs. the rudderbar, all I am saying is that with such a PRIMARY control you should reconsider using non-4130 grade tubing for your rudder bar but hey....that'sthe beauty of homebuilding---you can use whatever you want...just count me out as ever being your test pilot or passenger. Period. As longas YOU feel comfortable with your choices then YOU can do the test flying. Mike C. NX48MC________________________________________________________________________________Subject: Pietenpol-List: Re: Rudder bar and forward controls
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RE: Pietenpol-List: Re: Rudder bar and forward controls

Post by matronics »

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Nicely put, Bill.Michael, the question for me is, why would you WANT to use stainless steel?Other than being slightly more corrosion resistant than chromoly (it is NOTrust proof, but is corrosion resistant), it is generally an inferiormaterial. It has less tensile strength, as has already been discussed, ismore expensive, work hardens fairly rapidly and is difficult to drill. Whatpossible advantage does it have?It probably will be adequate for the task, but as was mentioned earlier, itwould be fairly simple to test it for this application by making a mockupand applying pressure with both feet. But why use it? It will need theends squeezed flat and welded, just as Mike's spreader bars were done.Stainless steel (particularly the austenitic grades, such as 18-8, or therest of the 300 series stainless steels) is useful for silverware andhypodermic needles and other applications where corrosion resistance is akey requirement. It is not much used in aircraft work because othermaterials are better suited. Try titanium. It has better strength,although not as much stiffness as stainless. And it has even bettercorrosion resistance.I suggest you listen well to Bill Church, since he is an engineer who spendsnearly every day designing for stainless steel. He knows his stuff.Jack PhillipsNX899JP "Icarus Plummet"Raleigh, NC-----Original Message-----
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Post by matronics »

Original Posted By: CLIF DAWSON
Michael P., Just how much tailwheel time do you have, and how long have you been flying? AlthoughI don't have a tailwheel endorsement on my license yet, it seems to methat the single most important control in a taildragger airplane is the rudder.I could be wrong on this, but I don't think so. But is this REALLY the placewhere you should be substituting inferior materials in your Perezenpol "justbecause"? If you decide not to use the SS tube, I have some leftover 1/2"type L (soft) copper plumbing pipe here I'll donate to you, it's probably lighterthan the SS... With as much deviation from the plans as you have re-designedinto your plane, it will hardly be recognizable as a Piet. I personallycannot figure out why you are going to such great lengths to re-engineer as muchof the plane as possible when the existing design works just fine. You seem to ask a lot of questions, which is a very good thing. In my opinionand 20 years of experience as a professional firearms instructor, there's no suchthing as a dumb question. However, you seem to ask your questions only inorder to get validation for your sometimes rather strange or perhaps even dangerousideas rather than to get honest answers from those who have engineeringdegrees, A&P certificates, and/or actually successfully built and flown theirown planes. These people offer their opinions and ideas based on practicalexperience, and then you summarily dismiss them and do it your own way anyhowafter all is said and done. I think Bernard got it pretty durn close 80 yearsago, and I think most on the list would agree with me. I think the point of all of these warnings by the very generous and very knowledgeablepeople on this list who know better is that NOBODY wants to see you gethurt (or worse), or hurt someone else (or worse). I think it's a lot betterto play the what-if game BEFORE something goes wrong than after. "What if Ihad only used 4130 for that rudder bar, then my plane might not be a pile of burningrags, splinters and inferior stainless tubing in that smoking hole in theweeds next to the runway."Sorry if I might have stepped on your toes, that's not my intention here. We allwish you the best and just want to see you build a SAFE airplane that won'tkill you or somebody else, and the Piet as built to the plans IS ALREADY a proven,safe design that doesn't need massive re-engineering.In the words of Forrest Gump, "that's about all I got to say about that," steppingoff my soapbox now.--------Billy McCaskillUrbana, ILtail section almost done, starting on ribs soonRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
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Re: Pietenpol-List: Re: Slow list day.........How about this idea?

Post by matronics »

Original Posted By: helspersew(at)aol.com
Subject: Re: Pietenpol-List: Re: Rudder bar and forward controlsThat must be why I have TWO rudder bars! :-)Clif.What you need to be aware of is the potential for the > pilot to bend the rudder bar, by inadvertently pushing with both > feet. The pilot will undoubtedly have both feet pressing against > the rudder bar at all times, and a bit of uncoordinated > footwork, or panic can result in an excessive amount of pushing > on both sides of the rudder bar at the same time.> > Bill C.________________________________________________________________________________Subject: Re: Pietenpol-List: Re: Slow list day.........How about this idea?
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Post by matronics »

Original Posted By: Brett Phillips
Hi Brett,That plug fouling thing has some merit. I had not thought of that aspect. I am not sure if I want to sell that side mount mag set-up, until things pan out. Thanks for your input.Dan HelsperPoplar Grove, IL.-----Original Message-----
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RE: Pietenpol-List: Re: Rudder bar and forward controls

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Original Posted By: speedbrake(at)sbcglobal.net
Every single person on here=2C most with a LOT of experience=2C have said it is a bad idea. If you are going to do it anyway=2C enough with the justifications and somewhat insulting remarks. Just do it and let's move on.Gene RamboDate: Tue=2C 1 Mar 2011 17:26:08 -0800
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RE: Pietenpol-List: Re: Rudder bar and forward controls

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Original Posted By: Michael Perez
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Re: Pietenpol-List: what to use and what to fly with comfortably--an ongoing

Post by matronics »

Original Posted By: Michael Perez
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RE: Pietenpol-List: Re: Rudder bar and forward controls

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Original Posted By: "Gboothe5"
Subject: RE: Pietenpol-List: Re: Rudder bar and forward controlsI agree there are people here who actually know what they are talking about. AsI have said I appreciate the comments and concerns by most here and I do thinkand rethink my position after reading such posts. I DO NOT appreciate the soapopera story telling just to suit ones own position nor the degrading name calling.I want to use SS here because that is what I want. I feel that even afterreading these posts, knowing what material I used, how it was assembled andhow it will be installed, I am comfortable using it as my rudder bar. I willkeep an eye on it as with the rest of the plane.True, the ends are squeezed and drilled, but they are not bent and I still feelthe landing gear sees more abuse then a rudder bar. Mike got 13 years out ofthat bar, I bet I will get at least that out of my rudder bar. Seems most feel that a rudder failure of some sort is a death sentence. Really?Is it imposable to make a landing without a rudder?I would rather not argue, but at times I feel some people just throw out words,numbers and stories that are not true.Michael PerezKaretaker Aerowww.karetakeraero.com________________________________________________________________________________
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Re: Pietenpol-List: Re: Rudder bar and forward controls

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Original Posted By: james theissen
Subject: Re: Pietenpol-List: Re: Rudder bar and forward controls
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Re: Pietenpol-List: Re: Rudder bar and forward controls

Post by matronics »

Original Posted By: Michael Perez
Subject: Re: Pietenpol-List: Re: Rudder bar and forward controls12,000 hours of experience tells me I would not want to lose my rudder control.Aileron, pitch, power and trim can all be dealt with. No rudder on a tailwheelaircraft? The best one can hope for is a violent ground loop on landing.Try your next approach with your feet on the floor through touch down and rollout. Let me know how it works out. Scott Knowlton -----Original Message-----
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RE: Pietenpol-List: Re: Rudder bar and forward controls

Post by matronics »

Original Posted By: Michael Perez
Interesting.I just Googled, "Aircraft Stainless Steel Failures.".quite a bitof reading.Gary Boothe________________________________________________________________________________Date: Wed, 2 Mar 2011 06:38:31 -0800 (PST)
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Pietenpol-List: Re: Slow list day.........How about this idea?

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Original Posted By: Michael Perez
I'm glad to hear that you haven't completely given up on the side drive. Keepin mind that you could always find a WICO model X that plugs into the distributorhole. They are not the prettiest thing in the world but as the old folksused to say, "Pretty is as Pretty does". They turn up on Ebay frequently, andparts are available from Standard Magneto Sales in Chicago.Brett PhillipsStrasburg, VANX311GPRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Wed, 2 Mar 2011 08:05:22 -0800 (PST)
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