Pietenpol-List Digest Archive

Fri 04/08/16


Total Messages Posted: 7



Today's Message Index:
----------------------
 
     1. 04:46 AM - Re: turnbuckles (Semih Oksay)
     2. 05:52 AM - Re: welding 4130 hinges (Bill Church)
     3. 06:05 AM - Re: motorcycle master cylinder (AircamperN11MS)
     4. 11:36 AM - Re: motorcycle master cylinder (tkreiner)
     5. 11:42 AM - Re: Re: motorcycle master cylinder (Jim Boyer)
     6. 12:37 PM - Re: motorcycle master cylinder (AircamperN11MS)
     7. 08:12 PM - Re: Re: Starting my build, but need to know which fuselage to build! (Ray Krause)
 
 
 


Message 1


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    Time: 04:46:50 AM PST US
    From: Semih Oksay <semihoksay@gmail.com>
    Subject: Re: turnbuckles
    Your turnbuckle may be old German. 32 tpi is 0.8 mm pitch, which is the thread pitch for metric 5 screw. I also have a couple of those turnbuckles from an old Fokker biplane. I also have one larger, metric 6 with 1.0 mm pitch. They don't mix with AN hardware. Hope this answers your question. Semih=8B On Thu, Apr 7, 2016 at 11:23 PM, Jack <jack@textors.com> wrote: > Ralph I did the same thing. I've heard some of the older sets threads > varied. It was important to keep them together as matched sets... > > Sent from my iPad > Jack Textor > > On Apr 7, 2016, at 2:53 PM, Ralph <ralphhsd@itctel.com> wrote: > > Early on in my Piet build I bought a large number of used turnbuckles at > Oshkosh. A couple years ago I took one of the end forks with me to Oshko sh > to be sure and get the correct size pins for the fork end. Now that I am > assembling the tail pieces I find I have misplaced the fork end to one of > the turnbuckles. I located a supple of used turnbuckles locally but can =99t > find one of the same thread pitch. I found one of the same diameter but > only about 4 threads will fit into the barrel. Under a microscope I coun t > 30 threads per inch on the type fork I need to replace. The used one I > found has 32 threads per inch as does the forks available from Aircraft > Spruce. Is it possible the used turnbuckles I got years ago at Oshkosh a re > a military spec which is different than the thread spec currently used on > civilian aircraft? I will be able to replace the entire turnbuckle unit > but I am curious about the 2 threads per inch difference in the forks. > Anybody have any explanation? > > Ralph in SD > > -- Semih Oksay


    Message 2


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    Time: 05:52:13 AM PST US
    Subject: Re: welding 4130 hinges
    From: "Bill Church" <billspiet@sympatico.ca>
    Dan, Technically speaking, post weld normalizing is not necessary when welding 4130 for thicknesses of 1/8" or less. However, the need to follow appropriate welding procedures, using the correct filler rods (in the appropriate sizes) etc is very important. And, as it has already been mentioned, slow cooling in very still air, at room temperature is critical. Bill C. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=454723#454723


    Message 3


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    Time: 06:05:45 AM PST US
    Subject: Re: motorcycle master cylinder
    From: "AircamperN11MS" <Scott.liefeld@lacity.org>
    Jon, Mt motorcycles have the same master cylinder. I have often wondered the same thing. I don't have brakes on my plane, that said you would really need to be careful about which brake calipers you use. The master cyl does not have much volume transfer when you apply the brakes. You could easily end up with a caliper that would require more fluid to operate that the master cylinder could supply with a single stroke. Perhaps you could use the caliper from the motorcycle as well. Then I wouldn't see any potential problems. In fact I suspect it would work very well. Just something to consider, -------- Scott Liefeld Flying N11MS since March 1972 Steel Tube C-85-12 Wire Wheels Brodhead in 1996 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=454724#454724


    Message 4


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    Time: 11:36:55 AM PST US
    Subject: Re: motorcycle master cylinder
    From: "tkreiner" <tkreiner@gmail.com>
    Scott, If you'll examine a fully bled disc brake setup, I think you'll find that the clearance between pad and disc is around .005 in. So, in order to operate properly, the brake master only needs a few thousandths of movement itself. In fact, if the ratio of piston areas is 8 to one, and we assume .005 piston travel at the caliper, the master cylinder piston only needs to move .040 in. The amount of fluid being moved is very small; in a kart or cycle brake setup such as the one shown the volume of fluid beng move is probable around .5 cc or less. Hope this helps... -------- Tom Kreiner Read this topic online here: http://forums.matronics.com/viewtopic.php?p=454739#454739


    Message 5


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    Time: 11:42:36 AM PST US
    From: Jim Boyer <boyerjrb@comcast.net>
    Subject: Re: motorcycle master cylinder
    HI Scott, Dick Navratil's brown Piet had Harley Davidson motorcycle brakes; mater cylinder and calipers. Cheers, Jim B.


    Message 6


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    Time: 12:37:17 PM PST US
    Subject: Re: motorcycle master cylinder
    From: "AircamperN11MS" <Scott.liefeld@lacity.org>
    You guys a spot on. I only mention the whole ratio thing so that all volumes are considered. That master cyl is very small, I know because I have a few. I just didn't want someone thinking that they might be able to operate a dual piston caliper with it. You need to do the math first. If done properly, I don't see any reason it wouldn't work. Yes I understand how it all works. I have well over 40 years either working on or designing tractors and fire equipment. Thanks for the input. I was just trying to answer his direct questions. Cheers all, Jim, I have never seen Dick's plane in person and did not know what brakes he had used. -------- Scott Liefeld Flying N11MS since March 1972 Steel Tube C-85-12 Wire Wheels Brodhead in 1996 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=454741#454741


    Message 7


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    Time: 08:12:11 PM PST US
    From: Ray Krause <raykrause@frontiernet.net>
    Subject: Re: Starting my build, but need to know which fuselage
    to build! John, I would like to get the most recent BPA newsletter. I guess my subscription ran out. Please send the info. I will send a check right away. No need to mail it to me, email is gone. Thanks, Ray Krause 843 Jay Street Colusa, CA 95932 Sent from my iPad > On Feb 29, 2016, at 5:12 PM, John Hofmann <jhofmann@reesgroupinc.com> wrote: > > The promised w&b articles. > > Best, > -john- > <Pietenpol Weight and Balance.pdf> > >> On Feb 26, 2016, at 7:52 AM, John Hofmann <jhofmann@reesgroupinc.com> wrote: >> >> >> I will post it to the list later today when I get to my hotel. >> >> Sent from my iPhone >> >>> On Feb 26, 2016, at 5:17 AM, johnnysdrop <johnnysdrop@googlemail.com> wrote: >>> >>> >>> Is the Brodhead / WW W&B calculator available online? >>> English Johnny >>> STILL building wings >>> >>> -------- >>> The only way is UP >>> >>> >>> >>> >>> Read this topic online here: >>> >>> http://forums.matronics.com/viewtopic.php?p=453205#453205 >




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