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Z bends - 10/13/2002 6:48:15 AM   
jlong34016


 

Posts: 365
Joined: 4/14/2002
From: columbus, OR,
Status: offline 		This is the only response i have gotten so far. Not trying to prove anyone right or wrong. Many things work. I'm thinking about putting them on both ends!

The preferred method (post # 9)

Not only do they work but in fact are the prefered method in all three classes of pylon racing, Quarter 40 and both Q-500 classes. The reason for this is reliability and safety. With the right tool and one of the best is the Dubro Z bend maker it can be done very accurately.

So jlong for small hi speed aircraft that you are flying it really is the best setup.

John
       Post #: 1

Z bends - 10/13/2002 5:19:34 PM   
IMAC Buff


 

Posts: 177
Joined: 1/26/2002
From: North Syracuse, NY,
Status: offline 		If your looking for justification for using Z-bends, I don't think you are going to find it from people who fly large scale and high performance airplanes. Sure I have used Z-bends in the past on a variety of airplanes in the 15 to 40 size range. But when it comes to large airplanes, 1/4 scale and up. Why use Z-bends on a airplane that you have invested thousands of dollars on?? Sure they work but Z-bends work on a friction fit. Once u lose that friction fit then you introduce slop into the control linkage. All of the servo horns that you would use on a larger airplane, would be very hard to get a Z-bend through in the first place. I don't think anyone is running Z-bends through a Anodized aluminum servo horn. I think it comes down to this. Why not make your control surfaces as smooth as possible with the use of ball links and very stiff push rods?? I can say that after building large aircraft, TOC size aerobatic, and jets, professionally now for 9 years, if I was to Z-bends on anyones airplane I would never get another project. I guess the moral of this story is that sure z-bends work but they have there place. If you are going to spend $5000 plus on a airplane don't be cheap, get some high quality hardware for your plane.

Cheers

(in reply to jlong34016)
       Post #: 2

ball links - 10/13/2002 6:24:46 PM   
jlong34016


 

Posts: 365
Joined: 4/14/2002
From: columbus, OR,
Status: offline 		Do you have a web site that has the equiptment you are referring to? What parts do you need for a typical link? Thanks

(in reply to jlong34016)
       Post #: 3

Z bends - 10/13/2002 10:15:59 PM   
IMAC Buff


 

Posts: 177
Joined: 1/26/2002
From: North Syracuse, NY,
Status: offline 		Here is a couple of links, will post more as I think of them.




http://www.cactusaviation.com/Misc.htm

http://www.centralhobbies.com/Accessories/cntrlhrn.html

(in reply to jlong34016)
       Post #: 4

Picture - 10/14/2002 7:20:39 AM   
IMAC Buff


 

Posts: 177
Joined: 1/26/2002
From: North Syracuse, NY,
Status: offline 		This is one of my usual setups on a large airplane. very smooth and most important no slop. Rocket City ball link with Hanger Nine Titanium push rod, Rocket city control horn drilled and tapped in a piece of 5/8 dowel rod. hope this helps

Cheers

Attachments
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(in reply to jlong34016)
       Post #: 5

Z-Bends - 10/15/2002 10:30:34 PM   
daven



Posts: 7026
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		I have no issues with using Z-bends on 180 mph planes. In fact, they are mandated by the AMA to pass inspection at the Nats for Pylon racing.

I take a piece of 2 56 rod and round the end slightly. I insert this into my drill and use it to enlarge the servo arm hole to fit the rod. work the drill in and out a bit to make sure you can get the Z-bend inserted.

This method insures a nice tight linkage between the bend and the servo arm. I check my arms after each season, and replace if any slop has developed. So far, I've replaced very few arms.

Z-bends are cheap, and effective if installed properly. Do not be hesitant to use them on an extreme speed plane.

_____________________________

Dave Norman

klasskote.com
supertrc.com

(in reply to jlong34016)
       Post #: 6

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