Brodhead Pietenpol Association

Original Posted By: steve(at)byu.edu
Group,I am in the process of fabricating the control system for our Piet. I recall talking to someone at Brodhead last year about the sizes of thecontrol pulleys that mount on the torque tube, and remember being toldthat the front pulley needs to be larger than the 2" diameter shown on the plans because of the almost 270 degree direction change the frontelevator cable must go through from the front stick lug, over the pulley,and to the back. (The concern is the bend redius of the cable / pulleyfor such a severe direction change.) In looking at the assembled torquetube, however, it is immediately obvious that there is not enough room between the torque tube and the rod connecting the front and rear sticksto install a much larger pulley without moving the connecting tube higheron the sticks. But then I get concerned about clearance between the connecting rod and the underside of the front seat.Has anyone shared this concern and successfully done anything about it?Is anyone aware of a documented rule of thumb for pulley sizes and degrees of change of direction for a primary flight control cable?A cursory reading of AC43-13 revealed nothing, and I certainly would appreciate any advice.Thanks in advance, -Bill________________________________________________________________________________

Original Posted By: BRIAN AND DONNA
Hi Bill: I'm putting a nearly 3" pulley on mine but I 'm not that far yet. Have a friend that has one on his and the result is a lighter touch to the stick and less wear all around. Ryder________________________________________________________________________________

Original Posted By: Steve Eldredge
First off, the next time you go out to the strip, look at the nearest J3. The aileron cables go up the front strut, do a (about) 285 degree turn, and then disappear into the wing. Somebody never told Mr. Taylor not to change directions. Also, I cringe when somebody says to use galvanized cable instead of SS. If you've never seen a cable rust, you're missing a real sight. It gets rusty in the middle first, from my experience, and by the time you find it the cable is so BRITTLE it almost separates in your hands.________________________________________________________________________________

Original Posted By: Michael Brusilow
If your stainless steel cable ever has just one strand broken andsticking out, cashier it. Throw it out and get a new cable. Instainless, if one wire breaks the rest are likely to follow closebehind. That one strand breaking is the only warning that you arelikely to get. Notice that elevators and cranes use only galvanized cable. Theadvantage is that, the steel used in flexible wire rope can be maliableand tough. Stainless becomes hard and brittle as it gets worked andold. Unfortunately, stainless will stay bright right up to the day itbreaks.Sure, galvanized cable will eventually rust. At least it rusts beforeit breaks, giving you a warning.Lauren ________________________________________________________________________________

Original Posted By: Dave and Connie
Ahmen________________________________________________________________________________

Original Posted By: Michael D Cuy
Thanks a lot for this one. Would you believe, I'm going to go withGALVANIZED.Maiser(at)adena.byu.edu on 09/02/99 06:21:10 PMPlease respond to piet(at)byu.edu @ INTERNETcc:Subject: Pietenpol-List: Re: Control pulleysIf your stainless steel cable ever has just one strand broken andsticking out, cashier it. Throw it out and get a new cable. Instainless, if one wire breaks the rest are likely to follow closebehind. That one strand breaking is the only warning that you arelikely to get.Notice that elevators and cranes use only galvanized cable. Theadvantage is that, the steel used in flexible wire rope can be maliableand tough. Stainless becomes hard and brittle as it gets worked andold. Unfortunately, stainless will stay bright right up to the day itbreaks.Sure, galvanized cable will eventually rust. At least it rusts beforeit breaks, giving you a warning.Lauren________________________________________________________________________________

Original Posted By: mbell1(at)columbiaenergygroup.com
>Thanks a lot for this one. Would you believe, I'm going to go with>GALVANIZED.Mike- You rebel ) The comment someone made about stainlesshappened to me where the my rudder and upper elev. cables rubsometimes as they come out of the same hole in my fuse....and lowand behold after about 90 hours I felt and saw one strand of the stainlessthat nicked my fingers. I bent the cable to look more closely andfound about 3 or 4 strands were next to go soon...but they sure stilllooked shiney. I replaced all those with galvanized cable. Mike C. ________________________________________________________________________________

Original Posted By: Ken Beanlands
Mike,I enjoyed the video and I was hoping to see your plane at Brodhead orOshkosh. Somehow or other, I missed it both places. (I didn't get to Oshkoshuntil Sunday)I did get to see fourteen? other Piets at Brodhead and another at Osh. What agreat time. I got lots of great pics of every Piet but yours. Lots of goodideas and information and encouragement. I was sick and it was hotter than"blue hades" but it was still a great place to be. I met the mysterious Mr.Wynn and purchased a Corvair manual. Later at Oshkosh, I found a usedCorvair maintenance manual and felt good buying it for $35. Since then thisdiscussion group pointed out that these manuals are available new fromChevrolet for $25 (but I got mine at Osh!!). I have the Piet screen saverinstalled on both PC's and Piet pics on my wall at work. What has Bernarddone to me?Enough BS. Just like everyone to know how much I am enjoying this.Mike BellColumbia, SCMaiser(at)adena.byu.edu on 09/03/99 08:22:23 AMPlease respond to piet(at)byu.edu @ INTERNETcc:Subject: Pietenpol-List: Re: Control pulleys - Stainless vs. Galvanized ControlCable>Thanks a lot for this one. Would you believe, I'm going to go with>GALVANIZED.Mike- You rebel ) The comment someone made about stainlesshappened to me where the my rudder and upper elev. cables rubsometimes as they come out of the same hole in my fuse....and lowand behold after about 90 hours I felt and saw one strand of the stainlessthat nicked my fingers. I bent the cable to look more closely andfound about 3 or 4 strands were next to go soon...but they sure stilllooked shiney. I replaced all those with galvanized cable.Mike C.________________________________________________________________________________

Original Posted By: fishin
And, if you're in Canada, you can buy the MIL Spec. 7x19 1/8" galvanized"aircraft cable" at Canadian Tire at an EXCELLENT price. It's exactly thesame stuff. I moved the spool over and read the side and sure enough, it'sexactly the same. You can also see no difference if you put it beside thestuff from ASS. THey also sell some other sizes, but nothing of much useon our planes (1/4", 3/8", etc). THere is no 3/32" available.KenOn Fri, 3 Sep 1999 mbell1(at)columbiaenergygroup.com wrote:> Thanks a lot for this one. Would you believe, I'm going to go with> GALVANIZED.> > > > > > > Maiser(at)adena.byu.edu on 09/02/99 06:21:10 PM> Please respond to piet(at)byu.edu @ INTERNET> > > To: piet(at)byu.edu @ INTERNET> cc:> > Subject: Re: Control pulleys> > If your stainless steel cable ever has just one strand broken and> sticking out, cashier it. Throw it out and get a new cable. In> stainless, if one wire breaks the rest are likely to follow close> behind. That one strand breaking is the only warning that you are> likely to get.> > Notice that elevators and cranes use only galvanized cable. The> advantage is that, the steel used in flexible wire rope can be maliable> and tough. Stainless becomes hard and brittle as it gets worked and> old. Unfortunately, stainless will stay bright right up to the day it> breaks.> > Sure, galvanized cable will eventually rust. At least it rusts before> it breaks, giving you a warning.> > Lauren> > Ken Beanlands B.Eng (Aerospace)Calgary, Alberta, CanadaChristavia MK 1 C-GREN________________________________________________________________________________