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Old 04-02-2010, 11:40 PM   #1
aeronerd
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Default control linkage options

Does anyone know of a good resource (book, website, forum, cave painting, etc) that shows all of the options for connecting servos to control surfaces? I would love to have pictures of all the common methods in one place for reference. I have been looking at all the pieces at my LHS, and on supplier websites, but i often get overwhelmed with the quantity and randomness of the organization. Also, I think some of the pieces would make a lot more sense seeing actual installations, rather than just the piece-parts and having to imagine the best way of connecting it all together.

I have learned quite a bit by seeing random photos on this site but when i look for control surface details specifically, it seems I can never find them.

I know I am probably overthinking this, but that is just my nature.

AeroNerd

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Old 04-03-2010, 04:52 AM   #2
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Default Control Hook-Ups?

Hello Aeronerd,
I don't know of any one source for all the control hook-ups, but perhaps one of the "How to get started in R/C" type books would have photos.
There's 3 main types of linkages from servo to control surface that I know of.
(1) Solid or non-flexible pushrod.
(2) Flexible cable in a sheath.
(3) Pull Pull.
A solid pushrod is perhaps the most common. It can be made of balsa strip stock with wire ends to engage the holes in the servo arm and surface control horn, or "NyRod", a nylon tube within an outer sheath, threaded at both ends for threaded couplers. Carbon fiber tube or rod, with wire ends or couplers is becoming popular. What they all have in common is that they are solid and stiff (or nearly so) which provides the ability to resist extension or compression. For example, when you command a servo to "Push" a surface, the slipstream resists the movement, it pushes back. If the pushrod can compress, it will not give an accurate control. Same for "Pull", if the pushrod can extend, even slightly, again we have inaccurate control or "Slop". For the same reason, holes in control horns and servo arms must fit their wire connections accurately and obviously, servos must be solidly mounted and strong enough for the job.
Flexible cable in a sheath is usually braided steel wire in a tight nylon housing. It can also be thin music wire in a sheath. Connector ends are generally soldered on. The advantage of this type of pushrod is that it can be curved to fit different applications. One example is a "T" mounted elevator and stabilizer with a fuselage-mounted servo. The pushrod must remain straight along the fuselage, then curve upwards (usually inside the fin) to the elevator. The wire is strong enough to resist extension (pull) and the sheath is fixed inside the fuselage to resist compression or "Bowing".
Last, we have "Pull Pull". This most closely resembles common full-scale aircraft construction. The servo itself has two opposed servo arms, when one pushes, the other side pulls. The control surface has horns extending on both sides - usually one long horn that extends equally out of both sides of the control surface. Thin wire, thread or fishing line is tied from one servo arm to (say) the upper control arm of the elevator. When this thread is "pulled" it will pull the elevator up. Another line is tied to the other servo arm and attached to the bottom elevator control arm. When this line is pulled, the elevator is pulled down. Pull Pull.
The lines must have equal length when tied, both should be in full tension. This type of control linkage is very common in WWI aircraft.
There may be others, but these are the most common I've seen.
If you Google "Pull Pull" you'll find some photos.
Hope this helps, Good Luck!
Ron
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Old 04-03-2010, 05:15 AM   #3
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Default Photos

Hi Aeronerd,
I found a few photos, hope they help!
Ron


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Old 04-03-2010, 10:44 AM   #4
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Default

these work great, they can be used on the servo arm and the control horn. use a tooth pick and apply blue lock tight on the threads, just a little, so it does not get into the arm pivot hole.

http://www.headsuprc.com/servlet/the...NECTORS/Detail


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Old 04-03-2010, 10:47 AM   #5
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carbon Fiber tube, with control wire epoxied into the tube







http://www.wattflyer.com/forums/show...katana+chellie

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Old 04-03-2010, 10:51 AM   #6
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thin plastic tube used for stiffen control wire and CF tube with wire epoxied in the tube.

http://www.wattflyer.com/forums/show...ick+cap&page=2



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Old 04-03-2010, 10:58 AM   #7
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a pull pull control set up

http://www.wattflyer.com/forums/show...llie+f16+build





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Old 04-03-2010, 11:32 AM   #8
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Have a look at http://www.airfieldmodels.com/inform...ware/index.htm

That covers most of the normal linkage styles though it's better on words than pictures.

The rest of that site is worth looking through too if you're the sort of person that wants to read all about it before trying it (me too ).

Steve
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Old 04-03-2010, 04:12 PM   #9
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Stock up on numerous types of Dubro control linkage parts, and you can get real creative. I often just throw them all out on a table, and think about how I can use them for a specific app. I came up with this setup for internal elevator linkage.


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Old 04-03-2010, 05:29 PM   #10
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Wow guys! Thanks for all the input! This is exactly what I was looking for.

Thanks again.

"The airplane is an inanimate object; therfore it must eventually respond to reason."
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Old 04-03-2010, 05:39 PM   #11
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Then you have Giant Scale types


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Old 04-03-2010, 05:41 PM   #12
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and some mid sized (40-60 size) types


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Old 04-03-2010, 07:48 PM   #13
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This thread has a lot of great info in it for everyone on control linkages for parkfliers, mid size planes and giant scale, I think it would be a great Idea to make this thread a Sticky, as it will be very very helpful to all Builder and Fliers, Take care, Chellie

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Old 04-03-2010, 08:03 PM   #14
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I second that.

Originally Posted by CHELLIE View Post
This thread has a lot of great info in it for everyone on control linkages for parkfliers, mid size planes and giant scale, I think it would be a great Idea to make this thread a Sticky, as it will be very very helpful to all Builder and Fliers, Take care, Chellie

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Old 04-03-2010, 08:43 PM   #15
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Default Thread Stickie?

Hi Chellie + Aeronerd,
The Forum sticky is a good idea, but it's recently been decided to limit the number of stickies per Forum.
So I added this thread to the "Builders Links" sticky, under "Control Systems, Information".
http://www.wattflyer.com/forums/show...031#post132031
Now it's up permanently, under the "Links"
Hope that's OK,
Ron
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Old 04-04-2010, 12:02 AM   #16
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Originally Posted by Sky Sharkster View Post
Hi Chellie + Aeronerd,
The Forum sticky is a good idea, but it's recently been decided to limit the number of stickies per Forum.
So I added this thread to the "Builders Links" sticky, under "Control Systems, Information".
http://www.wattflyer.com/forums/show...031#post132031
Now it's up permanently, under the "Links"
Hope that's OK,
Ron
Thats Fine Ron Thank You, Take care, Chellie

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Old 04-04-2010, 01:32 AM   #17
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Default Torque Rods

There are also Aileron connections called Torque Rods. Attached is a picture of the DuBro Micro Aileron System. I used this in my Pocket Rocket. My only issue is that the wire was a little weak for the plane I put it in, so there is a little too much play. I should have used the next size up. The good thing is that all of the connections are hidden in the fuselage.

Steve


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Old 04-04-2010, 04:49 AM   #18
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Default Torque Rods

Hi Aeronerd,
Steve's right, I forgot torque rods!
His post and photos will get you started, here's more info;
http://www.wattflyer.com/forums/showthread.php?t=35181
This thread was also linked on the "Builders Links".
Ron
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