Todd L.

My Feedback: (9)

I realy like that clean pin hole exit of the pull pull wires through the fuse. How do ya do it? And what type of wire/cable should be used? The plane is a 27lb Edge. It will be used for 3D flight.
Thanks. Todd L.

Flyboy Dave

My Feedback: (21)

I haven't tried it yet myself...but I've heard of guys
using stainless steel fishing "leader line" with the
ends silver soldered to the connectors.

You'll need some small plastic tubing through the
fuse to use as guides. You'll have to eyeball and
alighn the tubes perfectly through the fuse to keep
the cables straight and tight.

On a plane that big you might want to use a "tiller"
arm....so that the strain will be on the tiller, not the
servo.

Dave.

RickP

My Feedback: (2)

Todd,
Start from the rudder forward. Mount the horn on the rudder and then connect the cables and run them forward. Position the servo/belcrank assembly for the best angle through the rear of the fuse. Then use short lengths of nylon tube to guide the wires. "x"ing them helps but the crossing will still have to be too far to the rear for a perfect fit.
HTH
Rick

Todd L.

My Feedback: (9)

Thanks, That helps. Now flyboy Dave says to use steel leader line? Will that interfear with the radio system at all?

JohnW

My Feedback: (6)

While it is possible that a metal pull-pull cable can cause interference, I have never had a problem. I have used steel cables many times for pull-pull in 25%-35% planes without any problems.

Todd L.

My Feedback: (9)

Is there anyother type of materal that can be used in place of wire? Just want to know if there are any other options.
Thanks

A.T.

Check out all the Pull Pukll systems displayed under =
"Aircraft Design. Airfoils, Pull-Pull Systems, Flight Trim & Static Thrust Calculator."
=
Ackerman linkage for Pull Pull systems - B.Felice
Aerodynamics of Spar&Rib Structures
Boost-tabs
Canards - Palos RC
Canard design (Zip download) - Paolo Zini
Cardboard R/C Planes
Design Calc - from Van's Place (site down - email Alan for a copy.)
Design - explanation for beginners
Design Parameters - Basic chart
DJ Aerotech - Gliders & Vtails - FAQ
Flying Wing and Bird flight designs
Flutter - Ed Moorman (site down, email Alan for a copy)
Plane Geometry - R C Soarer
Practical Model Design - RCFU
Pull Pull Controls - Brian Felice
Pull-Pull Controls - Bob Adkins
Pull-Pull Controls - Giant scale - R.Forgues
Rotary Driver System - Ailerons-Elevators etc.
Selected Topics of Model Aerodynamics
Sources of Aeronautical Information
Static Thrust calculator - select prop etc - Barry Hobson's Download Zip File
Trim Chart for flying RC aircraft
UIUC Airfoil Data Site
Wing Loading Charts for R_C Aircraft
regards
Alan T.

at http://homepages.ihug.co.nz/~atong/

Flyboy Dave

My Feedback: (21)

It wont interfere any more than the regular pull pull
wires do. Run your antennae wire up high , out of the
top of the cabin to the top of the tail. Your pull pull
wires will be down low.

You can get the stainless wires in any thickness you
want....much stronger, and wont corrode. Looks better too....

Dave.

Todd L.

My Feedback: (9)

Thanks for all the guys.

mikenlapaz

Another active thread same ? w/different thougts!

http://www.rcuniverse.com/showthread...hreadid=502284

mikenlapazz

green river rc

My Feedback: (2)

I use the extension tubes on a WD-40 can to pipe the cables through whatever gets in the way. I have a spool of control line cable that I bought when I was a kid, that I have been using for years. Might be a lifetime supply? Never had any problems with interference, but I keep my antenna away from them.

Damnathius

Try the DuBro coated cable set in 4-40. Making the fuse penetrations with plastic tubing like NyRod housing, perhaps through small blocks of plywood is a good idea, but if you run straight uncoated cable, it will cut through the tubing in the fuse. (Small cable makes a great plastic pipe cutter) The DuBro is probably your best bet and plastic on plastic is much smoother than cable on plastic.

I just finished the elevator and rudder cable penetrations on my Nieuport in this manner. If you want a pic I can snap one for you and post it.

As far as interference, most modern up to date narrow band radios should be unaffected, unless you have uncoated cables rubbing together, which is not good in a pull-pull anyway.

TOYMAKER

My Feedback: (6)

I use kevlar. You must guide it through an outlet like teflon tubing otherwise you will get chafing of the cable. I bought a reel of kevlar control line for about 8 bucks American. Should last for many a plane.

Tie the kevlar on an eyelet at your control end. Use a double knott with a drop of thin c/a and it will not come loose. Kevlar also eliminates the fear of interference. Cured a twitchy metal geared servo I had on rudder one time that I had piano wire on the first go around.

If your not sure of it try a test of it using a fishing scale. I pulled over 85lbs and could not break it.

mikenlapaz

'spyder wire' fishing line 50# test .011 diameter comments on other post listed above. stronger than steel for its size.
mikenlapaz

tbone4343

My Feedback: (4)

where do i get teflon tubing as all 3 shops near me shrug and say i dont know never heard of it ?

TOYMAKER

My Feedback: (6)

If you cant find teflon use a thin flexable tubing like Nyrod or Golden rod would work also. Most anything in a plastic tubing should work fine. Teflon just happens to be what has worked good for me. Make sure there are no sharp edges on the inside of the tubing after cutting. Take an Exato knife and chamfer the inside edges.

Good luck...

Sense963

My Feedback: (10)

I'm going to do a pull-pull on my next project, an Astro Hog. Buddy of mine says it's important to have the cables parallel so there's no slack when one pulls....(same distance apart at servo and horn end) Sounds like cutting the holes in the fuse is a crap shoot at best. Oh well...guess I'll fall off that bridge when I come to it..!

mikenlapaz

A link with 3 different approaches to pull with pics.
http://www.rc-pilots.org/links.html

The link re: Ackerman linkage does not open. If you find it somewhere else, share it here please.

If I understand correctly, control horns do not mount with attachment holes directly over the hinge in pull pull as my instructions state for normal install !

a search this site for: U Stik can hover has some good pics as well. Was glad to find it as I have a 120 in shop ready to put together and the thread may have changed some ideas before I even start.

mikenlapaz

NGH00d

Can anyoneone tell me what exactly is a pull pull system. I think I have and idea it is the servo is always going to pull as the need to push has been eliminated. Is this correct? If so how is it achived. Thanks a newbie

BretR

My Feedback: (1)

Here is the updated link to the web page about ackerman:

http://members.cox.net/bdfelice/

NGH00d

Thanks Bret
Very interesting. I think I'm going to give it a try.
Neil

mikenlapaz

Thank you,
that is the type explanation I was looking for and saved me some problems if I had used manufacture instructions on horn install.
mikenlapaz

NGH00d

Thanks Miken Lapaz
Neil

tbone4343

My Feedback: (4)

looking for a source for teflon tubing as discribed in thread or maybe this is used on something else and can be canablized. building a sig su and using p/p and where they pass through fusealage they need something .also wire criss crosses in fus. and i want to keep these from rubbing . the wires i'm using are coated already with teflon ,made in germany kavan type and i think teflon to teflon would be great ,also i was thinking of turning servo a little so wires wont touch where thay cross.
does anybody have any input on this problem or a source for teflon tubing . I was thinkink about the tubing for intervinus bags? they seem very soft and might not be rigid ,maybe thats teflon? plastic for nyrods seems abrasive as to the teflon on the kavan p/p cables ?

krayzc-RCU

My Feedback: (31)

thanks for this one as i like this set-up and i will start on this one this week in my radiocraft project.

http://www.geocities.com/roger_forgues/PullPull.htmll