Re: Pietenpol-List: elevator cables

matronics · Post by **matronics** » Sat Feb 09, 2002 10:53 pm

Original Posted By: "Oscar Zuniga"
Subject: Re: Pietenpol-List: elevator cablesPietersI'm getting ready to put in the torque tube and controlls.I dont like the slack in the elevator cables especially in stick forward. I couldnt see any way to improve this. Does anyone have a different placement of pulleys or stick attachment or bell crank that will improve the situation? Henry ( Borodent)________________________________________________________________________________

matronics · Post by **matronics** » Mon Feb 11, 2002 4:51 am

Original Posted By: Fisherman Caye
Subject: Re: Pietenpol-List: elevator cablesHenry: Last year at Brodhead, a man named Ken Perkins ( he put on aforum ) said he tackled the slack cable problem. As I recall he re didthe bell crank to get the geometry right and the cables remain tightthrew the whole deflection. He sold a drawing. Wish I had bought one. Idon't have his address. Leon S.________________________________________________________________________________Date: 11 Feb 2002 04:53:31 -0800

matronics · Post by **matronics** » Mon Feb 11, 2002 4:55 pm

Original Posted By: "Warren D. Shoun"

matronics · Post by **matronics** » Mon Feb 11, 2002 4:57 pm

Original Posted By: "D.Dale Johnson"
Subject: Re: Pietenpol-List: elevator cables

matronics · Post by **matronics** » Mon Feb 11, 2002 5:13 pm

Original Posted By: "Warren D. Shoun"
Where is Ken Perkins from? We could do a people search on him.walt----- Original Message -----

matronics · Post by **matronics** » Mon Feb 11, 2002 5:17 pm

Original Posted By: Fisherman Caye
Hey FishermanI looked at this long and hard. Asked around, studied weights and torquecurves. I found what I think are a couple of interesting prospects, mostnotably the Toyota 22r you've mentioned before and the WWII-era Jeep engine,which has been discussed on this list. Both could produce enough thrustwithout a redrive, in my humble opinion.And it sure would be nice to work a diesel like the little VW 4 cylinderinto a Pietenpol. What could be simpler than a direct drive diesel?But I think the caveat that's been mentioned a lot on this list -- thatautomobile engines take time and money to convert to aircraft use -- holdstrue. There are hidden pitfalls, including that the crank might break.I think in the end a proven conversion is the way to go.Just my two cents.Ken Chambersin the early stages in Austin, Texas.----- Original Message -----

matronics · Post by **matronics** » Mon Feb 11, 2002 5:18 pm

Original Posted By: Leon Stefan
I hope someone has his number or a copy of the drawing, I'd love to know howhe did it.----- Original Message -----

matronics · Post by **matronics** » Mon Feb 11, 2002 5:20 pm

Original Posted By: del magsam

matronics · Post by **matronics** » Mon Feb 11, 2002 5:36 pm

Original Posted By: "D.Dale Johnson"
Subject: Re: Pietenpol-List: engines choices.

matronics · Post by **matronics** » Mon Feb 11, 2002 5:44 pm

Original Posted By: "KenGailGriff"
Ken, does you Dad still have his aviation store in Greenville? Mark----- Original Message -----

matronics · Post by **matronics** » Mon Feb 11, 2002 6:11 pm

Original Posted By: "Leon Stefan"
FYI:Ken Perkins has a machine shop business in Olathe Kansas. He had his "longnose" orange A powered Piet at Brodhead last year. He has custom waterpumps and other goodies for sale as well as the bell crank drawings.Contact him at:Perk's Aerowerks1480 MartwayOlathe, KS 66061 Phone 764-6949 (no area code given)Lou Larsen----- Original Message -----

matronics · Post by **matronics** » Mon Feb 11, 2002 6:59 pm

Original Posted By: Fisherman Caye
----- Original Message -----

matronics · Post by **matronics** » Mon Feb 11, 2002 7:50 pm

Original Posted By: Mark
Sure does, but he's not stocking spruce anymore. Got out of the businessjust as I started to need him.Still has lots of plywood and hardware. Got a web site nowhttp://alphaaviationsupply.com/ and a new location at the municipal airportin Greenville.Thanks for asking Mark. Gave me a chance for a little advertising.Ken----- Original Message -----

matronics · Post by **matronics** » Mon Feb 11, 2002 8:18 pm

Original Posted By: owner-pietenpol-list-server(at)matronics.com
The trick is to have the same length levers on the bell crank as on theelevator. The center pivot offset of the bell crank has to be duplicated atthe elevator hinge/horns. The Idea is to form a parallelogram. Try sketchingout your bell crank and the elevator hinge and horns. If you get it rightthe cables do not go slack. It can be done.John Mc-----Original Message-----

matronics · Post by **matronics** » Mon Feb 11, 2002 11:47 pm

Original Posted By: "Gary McNeel, Jr."

matronics · Post by **matronics** » Tue Feb 12, 2002 6:28 am

Original Posted By: John McNarry
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matronics · Post by **matronics** » Tue Feb 12, 2002 7:58 am

Original Posted By: Fisherman Caye

matronics · Post by **matronics** » Tue Feb 12, 2002 11:53 am

Original Posted By: Michael D Cuy
Ref. John McNarry's post Feb.11/02 regarding elevator cable slackening.When I built my Pietenpol, I made the elevator control system in accordace with the plans because I wasn't smart enough to rea-lize that the geometry would promote cable slackening towardthe extremes of elevator travel.As designed, there were no stops incorporated to to restrict theelevator travel. I flew it for a couple of years like this and decidedto install adjustable stops on the torque tube, one ahead and the other aft of the rear stick. (Ideally, stops should be installed at the control surface itself. This was not an option because the tail sur-faces of a Pietenpol have such light wood framing and mine were already built, covered and flying). For what it's worth, I settled on elevator travel of 32 degrees UP and 25 degrees DOWN, plus or minus 2 degrees at both limits.These settings have been in place for well over 600 hours of fly-ing and have been completely satisfactory. The elevators no lon-ger nearly touch the ground when the aircraft is parked without thestick being tied back and the cable slackening at the travel limits is hardly noticeable.So if your a/c is finished and you don't want to rework the system,this could be an option. It worked for me, but isn't guaranteed be-cause no two Pietenpols will be exactly the same.Graham Hansen (CF-AUN)________________________________________________________________________________Date: Tue, 12 Feb 2002 16:52:45 -0500

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