Pietenpol-List: Elevator cable slack

An archive of the Matronics Pietenpol Listserve.
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Pietenpol-List: Elevator cable slack

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Original Posted By: Peter Knowles[SMTP:peknow(at)midcoast.com.au]
Peter,The Pietenpol I have also has a similar problem. When my dad firstbought it (1972) we discovered the bellcrank in the rear of the fuselagewas installed backwards (or so we thought) and we flipped it over. Thisgreatly improved the situation but did not completely solve it. Theplane underwent some major repairs recently and I noticed the problemstill exists. I forget how bad it was before so I can't compare theslack. Most of the slack in my plane was (and is) between the bellcrankand elevators while yours is in the forward part of the system. Perhapsothers in the group can provide more input....Thanks to Steve for cleaning up the repeat messages and such! It islooking much better.Jim________________________________________________________________________________
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Re: Pietenpol-List: securing bungee ends

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Original Posted By: "Michael D Cuy"
Thanks Mike for the input. The tywrap idea sounds good to me. I have tobungee from Wicks, your right, it has much thicker rubber strands than fromthe marine stores.The Piet project is getting hard to put down these days. I'm watching somany things come together at this point. Cowlings going on, finishingcovering the wing, it's starting to look like a real plane.Dick----- Original Message -----
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Pietenpol-List: securing bungee ends

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Original Posted By: clif
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RE: Pietenpol-List: Flight test plan

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Original Posted By: Kip & Beth Gardner
Nowhere near needing it yet, but was today thinking about a flighttesting plan.There is nothing in the archives and I've yet to find anything on thenet, but I think this would be a good Idea to do and a good addition tothe archives.If nothing turns up, I will want to put one together myself, so let meknow if anyone finds anything or has suggestions. Anything in Mr. B'sbooks?As it happens I have a good friend who is a real live test pilot andmember of the national Association of Professional Test Pilots. Whetherwe draw one up from scratch or find something, I'll run it by him. Maybe we can get a stamp of approval and more brownie points for thefinal inspection.LarryLarry I found a really neat book at Barnes & Noble called "Flight TestingHomebuilt Aircraft" by Vaughn Askue. It does an excellent job of explaininga number of important principles of stability and control and gives a stepby step plan for test flying your homebuilt. I intend to use it when I testmine. The program will occupy most of the 25 hour test time required by theFAA, but you've got to fly those 25 hours anyway and this way you willthoroughly know your airplane at the end of that time, rather than justspend 25 hours boring holes in the sky.Jack________________________________________________________________________________Date: Fri, 15 Feb 2002 18:31:07 -0500
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Re: Pietenpol-List: Elevator cable slack

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Original Posted By: Larry Neal
Since we are (hopefully) back to addressing building problems we all have,could we get one volunteer (I have no problem to it being me) who can callMr. Perkins and get a full description of his solution to the bellcrankgeometry problem and share it with everyone here? I just suggest it asopposed to several of us calling him.Gene________________________________________________________________________________Date: Sat, 16 Feb 2002 05:20:32 -0600
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Re: Pietenpol-List: Control bearings

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Original Posted By: "Larry Neal"
Wooohhhhh!Another excellent post (one with a nice tip in it). Thanks Larry. That'swhat this group is all about. I say lets just ignore things and people that bug us.Ignore Shield Up!Later, bert----- Original Message -----
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RE: Pietenpol-List: Elevator cable slack

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Original Posted By: owner-pietenpol-list-server(at)matronics.com
I agree, Go for it Gene. I wish this information had been available a yearago when I built my control system. Now I've got the slack built in, and Iain't about to do it over. I will use Graham Hansen's approach with controlstops (another excellent post and proof that this forum can be very useful).Jack -----Original Message-----
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Re: Pietenpol-List: Elevator cable slack

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Original Posted By: "Gary McNeel, Jr."
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> Re: Pietenpol-List: Elevator cable slack

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Original Posted By: "Gary McNeel, Jr."
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Re: Pietenpol-List: Elevator cable slack

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Original Posted By: del magsam
Subject: Re: Pietenpol-List: Elevator cable slackIn a message dated 2/15/02 3:35:21 PM Pacific Standard Time, kipandbeth(at)earthlink.net writes:> Since we are (hopefully) back to addressing building problems we all have,> >could we get one volunteer (I have no problem to it being me) who can call> >Mr. Perkins and get a full description of his solution to the bellcrank> >geometry problem and share it with everyone here? I just suggest it as> >opposed to several of us calling him.> >> >Gene> > Go for it Gene! I for one am very interested in this particular issue -> should be starting work on controls & other metalwork in the next 6 months> or so.> > Cheers!> > Kip Gardner> > 426 Schneider St. SE> North Canton, OH 44720> (330) 494-1775> > > Gents,I have talked to Ken for hours at a time. He comes to our local EAA chapter fly-in each summer. The essence of the installation on his plane simply puts the centerline of the cable connections of the elevator horns so they rotate about the hinge point. Its a geometry thing. The same applies to the walking beam. It is made in such a way that the cable connections are made to the center of the beam width so these points will rotate about the axis. Doug Bryant Wichita, Ks ________________________________________________________________________________Date: Fri, 15 Feb 2002 16:49:45 -0800 (PST)
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RE: Pietenpol-List: Flight test plan

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Original Posted By:> owner-pietenpol-list-server(at)matronics.com
For a really good flight test guide, get FAA AC 90-89A, Amateur-BuiltAircraft and Ultralight Flight Testing Handbook.It's available on the internet for free athttp://www.airweb.faa.gov/Regulatory_and_Guida ... 9A.pdfNote: It's 797KB, so if you download over a modem, it'll take awhile. :)Ric> -----Original Message-----
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Re: Pietenpol-List: Elevator cable slack

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Original Posted By: "Gary McNeel, Jr."
----- Original Message -----
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> RE: Pietenpol-List: Flight test plan

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Original Posted By: Larry Neal
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Re: Pietenpol-List: Flight test plan

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Original Posted By: Larry Neal
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> > > Re: Pietenpol-List: Elevator cable slack

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Original Posted By: Kip & Beth Gardner
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Re: Pietenpol-List: Elevator cable slack

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Original Posted By: JEFFREY WILCOX
Subject: Re: Pietenpol-List: Elevator cable slackPiet PilotsHas anyone noticed, when flying in climb or dive attitude that the cables that go from the stick to the bellcrank -that one or the other gets slack?-------------------------Prior to building the torque tube etc, I made a mockup that showed such slackness. But it uses real thin cables and the slackness effect in the actual as per plans built torque tube may be unnoticeable (which is what I suspect).-------------------------I would appreciate any feedback on thisHenry Williams ( borodent)________________________________________________________________________________Date: 18 Feb 2002 04:21:05 -0800
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Re: Pietenpol-List: Craig visit to Chapter ??? up in West Palm

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Original Posted By: Fisherman Caye
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Re: Pietenpol-List: Elevator cable slack

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Original Posted By: "Gene Rambo"
Subject: Re: Pietenpol-List: Elevator cable slackIn a message dated 2/17/02 10:01:40 PM Pacific Standard Time, Borodent(at)aol.com writes:> Piet Pilots> Has anyone noticed, when flying in climb or dive attitude that the cables > that go from the stick to the bellcrank -that one or the other gets slack?> -------------------------> Prior to building the torque tube etc, I made a mockup that showed such > slackness. But it uses real thin cables and the slackness effect in the > actual as per plans built torque tube may be unnoticeable (which is what I > suspect).> -------------------------> I would appreciate any feedback on this> Henry Williams ( borodent)> > > Henry,I have 110 hours so far with no bad side effects. My planes are rigged just tight enough to not bind anywhere in the full limit of the travel. Cable slack is not an issue to me and wasn't while I was building the first plane. Doug Bryant ________________________________________________________________________________
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Re: Pietenpol-List: Elevator cable slack

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Original Posted By: "Gene Rambo"
Subject: Re: Pietenpol-List: Elevator cable slackDoug thanks for the input, Henry________________________________________________________________________________
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Re: Pietenpol-List: Elevator cable slack

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Original Posted By: Doug413(at)aol.com
Subject: Re: Pietenpol-List: Elevator cable slackMike CI am interested in the problem of cable slack and tension in going from the stick to the elevator bellcrank. In the archives I found this eqrlier responce opf yours=================William- not to worry. This is typical of the Piet control system design.It drove me nuts because the one cable would go taught, the other would droop.Guess what ? That's normal. I tried every combination of upper and lowercable lengths to the elevator bellcrank and there is just no perfect setup.It's going to do that by nature of the geometry. For this reason make sure youuse pulley guards as shown in the Bingelis books. For sure do this on EVERYpulley. They are easy and will keep you alive and the cable in the groove of thepulley. Plus a good FAA inspector will demand these.Mike C.=========================Did you end up building the torque tube etc as per plans or did you find any change to improve the geometry ( all the changes I tried didnt help much )Henry Williams ( Borodent)________________________________________________________________________________
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Re: Pietenpol-List: B Model Carb

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Original Posted By: "John McNarry"
Subject: Re: Pietenpol-List: B Model CarbIn a message dated 2/18/02 3:28:56 PM Pacific Standard Time, kipandbeth(at)earthlink.net writes:> Can the B model carb several of you were discussing be configured in a> gravity-feed/updraft configuration with carb heat like a Stromberg or other> aircraft carb? Can you rig a mixture control & does that make sense? It> sounds like a good, economical alternative to a Stromberg or one of those> new, pricey throttle-body carbs that are out there. Any particular problems> with it? Wm. Wynne says that his conversion needs a carb that will suck at> least 350cfm, is the B up to that? I've heard enough discssions on this> list of problems with old Strombergs like what Walt is currently> experiencing that I'm not sure I want to go that route.> > I hadn't known (or had forgotten - more pre-senior moments these days!)> that Bernie used the model B on his Corvair-powered planes. Andrew P. let> me look over "The Last Original" when I visited him a couple years ago, but> we didn't pull the cowling, so I didn't get a look under the hood.> > Cheers!> > Kip Gardner> > Kip,I hope I understood your question correctly. The B is an updraft carb. I have only seen it used with gravity fuel systems, on Piets. It may be able to be rigged with mixture, however, for most flying the mixture control is probably not needed. BHP used this carb on most of the A powered airplanes and the two Corvair powered ones with simple sucess. The installation on the Corvair places the carb inside the cowling so the carb intake has some heat all the time to prevent ice. The A installations also have heat all the time from the front stack. It makes a very suitable carb for the Corvair as already developed. I pulled the cowling pins on the Vair in the museum at Oshkosh and studied the installation carefully; very impressive, and simple. I sure like the B carb on my A powered planes. I have been buying them at the car swap meets here.at a cost range from about $15 to $65. Carb kits are available which include everything except the float. Hopes this helps some. Doug Bryant ________________________________________________________________________________
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RE: Pietenpol-List: B Model Carb

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Original Posted By: owner-pietenpol-list-server(at)matronics.com
KipThe float assembly, hinged at the side is the biggest advantage of a B overan A carb. They both have adjustable slow speed jets in conjunction with thechoke. Usually wired off for Piets. High speed changes would have to be madewith jetting. The A and b engines process about 80 to 100 cfm max. It doeslook something like a Stromberg or Marvel Schleber updraft. Ever considereda big SU from say a 2 liter Volvo?John Mc-----Original Message-----
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Re: Pietenpol-List: B Model Carb

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Original Posted By: "Gary McNeel, Jr."
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Original Posted By: "Jack Phillips"
I have read in the archives about slack cables and it seems that it is pretty muchuniversal to the Pietenpol. Mine are tight(just right) at full down elevator,then the lower cables start going slack as the elevator is raised gettingthe most slack in the center position, then as you go to full up elevator theybegin to pull most of the slack out as you reach full up. I can do cosmeticswith some light springs holding up on the cables. Why I am posting is flutterpossibilities. I think I am worrying over nothing, just needing reassurance thatthey all get slack more or less!--------Jerry Dotson59 Daniel Johnson RdBaker, FL 32531Started building NX510JD July, 2009Ribs and tailfeathers doneusing Lycoming O-235Read this topic online here:http://forums.matronics.com/viewtopic.p ... __________
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RE: Pietenpol-List: Elevator cable slack

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Original Posted By: owner-pietenpol-list-server(at)matronics.com
You are worrying about nothing, Jerry. Every Piet I've seen has some slackin the cables somewhere in the range of motion. I've never heard of flutterproblems in a Pietenpol (or any other airplane as slow as a Piet). Don'tadd springs or anything other than a little leather patch on the leadingedge of each stabilizer to prvent the cable from chafing the fabric, and goout and fly the thing.Jack PhillipsNX899JPRaleigh, NC-----Original Message-----
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Pietenpol-List: Elevator cable slack

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Original Posted By: Ben Charvet
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Pietenpol-List: Re: Crash - Long Post

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Original Posted By: Dan Yocum
My wife snapped this photo at the Moment of Truth.- Pat--------PatrickXL/650/CorvairN63PZ (reserved)Read this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/kp_2 ... ______Date: Sun, 01 Aug 2010 09:12:26 -0500
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Pietenpol-List: Re: project progress update

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Original Posted By: Kip and Beth Gardner
Mike wrote:"The ring gear is up front and is a standard WW part along with the starter herecommends (with his nose gear)."Personally I think that nose gear on a Pietenpol would look horrible. Keep it asa taildragger...Seriously, though, it looks like you guys "nailed it" in designing your Piet/Corvaircowling.Really nice.Bill CRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
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Pietenpol-List: Elevator cable slack

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Original Posted By: "Jerry Dotson"
l-list(at)matronics.com=0A>Subject: Re: Pietenpol-List: project progress update =0A>=0A>=0A>=0A>Hi Mike,=0A>Your cowling is looking good. Making it out of aluminium has got to be a real =0A>challenge; you and your dad Vic are doing a nice job of it.=0A>Now if you just had a 200 ton hydropress for the small stuff. We had one at the =0A>Boeing plant I worked at and boy would that have made cowling and steel fitting =0A>easy. Thats what my nightmares are made of.=0A>Cheers, =0A>Jim=0A>-=0A>-=0A>=0A>----- Original Message -----=0A>From: "Michael Groah" =0A>To: pietenpol-list@matronics.com=0A>Sent: Saturday, July 31, 2010 7:28:32 AM=0A>Subject: Pietenpol-List: project progress update=0A>=0A>=0A>=0A> I don't post very often, as I like to sit back and just soak up the information =0A>from everyone else, =0A>=0A> but I told Gary Boothe I'd send him a pic or two updating the progress on my =0A>cowl and I figured =0A>=0A>I'd let everyone else see too. All of the firewall forward stuff really eats a =0A>lot of time and seems like =0A>=0A>it doesn't show. Friends drop by hearing that we have been working on the plane =0A>and I'm sure they =0A>=0A> can't see any progress. We do although, have the engine just about ready to =0A>run, as soon as I get the=0A>carb rebuilt and the air filter mounted. The=0A> cowl is getting closer, but there is still a bunch to do there =0A>as well. My dad (Vic) and I are still plugging away at it out here in =0A>California, and may actually finish =0A>=0A>it one of these days! Anyways, I'm gonna go grab my wife and daughter and go =0A>enjoy the morning air =0A>=0A> flying the Piper. Keep building!=0A>=0A>Mike Groah=0A>Tulare CA =0A>=0A>=0A> st" target=_blank>http://www.matronics.com/Navigator?Pietenpol-List =0A>ttp://forums.matronics.com =_blank>http://www.matronics.com/contribution =0A>=0A> " target="_blank">http://www.matronics.com/Navigator?Pietenpol-List =0A>tp://forums.matronics.com _blank">http://www.matronics.com/contribution -========================================== =0A=0A=0A=0A ________________________________________________________________________________Subject: Pietenpol-List: Elevator cable slack
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