V-Tail Linkage Tip  
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All Forums >> RC Airplanes >> Pylon Universe - RC Pylon Racing >> Q-500 Racing >> V-Tail Linkage Tip
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V-Tail Linkage Tip - 1/22/2008 1:28:21 AM   
daven



Posts: 6909
Joined: 12/7/2001
From: Andover, MN, USA
Status: online 		Been working on a few planes the last month, and thought I'd share a tip that I've mentioned a few times, but never really documented it well.

When I build a quickie with a V-tail, I use 1/8" carbon fiber tube as my pushrods. It is available several places, and the center of the tube is a slip fit for 2/56 rod.

Before I glue anything into the carbon, I take a piece of 2/56 rod and wet it with a paper towel lightly soaked in Alcohol (the non-drinking kind) and slowly push it in and out of the tube to clean any debris. When I glue rod into Carbon, I use 5 minute epoxy, and have never had a failure. You just gotta be carefull that you get enough glue into the rod, it is a pretty snug fit.

The end that is attached to the V-tail halves can't be seen in the pictures, but I take a 2" piece of 2/56 rod with about 1/2" of thread on one end and glue it into the carbon rod. Once you push the glue incaased rod in, slightly turn the rod a couple times (clockwise) and this buries about an 1/8" of thread inside the tube. If you turn it too many times, the rod can crack/splinter and you do not want to do that. I then attached a dubro ball link to the threas and popped it on the ball that connects to the torque rods of my V-tail.

In Picture #1 I have my two Servos mounted (JR Sport MN-48s), they are plugged into a receiver, the transmitter is on, and the servos are perfectly centered. I am testing these servos for our local OS .46 class in 2008, I'm not sure I would trust them with a Nelson powered plane, but will start at 125 mph and go from there. At $22, 48 oz torque, and less than ounce, they seem like a good fit for V-tail servos.

In Picture #2 I attached 4 lightweight clamps that hold the elevators in perfect neutral position.

In Picture #3 I show a paper towel draped under the pushrods. When you start to glue the rods into the carbon, there is always a little spooge out, and the paper towels catch it, so that it doesn't stick to the bottom of your fuse.

Picture #4 shows the rods glued into the carbon, the servos centered, and the servo arm screws in place. Once the glue is dry, I give it 10 minutes, I switch off the receiver and turn off the transmitter. Everything is perfectly centered without worrying about sub-trim, or mechanically adjusting it by twisting the rod and hoping the ball links twist at the torque rods without popping off.

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Dave Norman

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RE: V-Tail Linkage Tip - 2/4/2008 2:48:57 PM   
vworley


 

Posts: 8
Joined: 7/8/2007
From: , TN, USA
Status: offline 		Dave, thanks for the post and info. Quiet timely for me!

Victor

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RE: V-Tail Linkage Tip - 2/4/2008 2:54:28 PM   
fizzwater2


 

Posts: 800
Joined: 8/16/2004
From: Paola, KS, USA
Status: offline 		spooge? that's a new word on me...

Dave, this is a great writeup. I've used carbon fiber tubes (like you, I use the 1/8" on the last couple of airplanes, and it would be tough to go back to something else.

What do you think of those MN48's?

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RE: V-Tail Linkage Tip - 2/4/2008 3:56:45 PM   
daven



Posts: 6909
Joined: 12/7/2001
From: Andover, MN, USA
Status: online 		Not real sure on the MN-48's yet. It looks like they are what replaced the Expert SL-451 servo I had used in Sport 424 type racing on my v-tails. If they are similar, I am happy with them for a $22 servo. I don't think I would use one on Aileron, or for Q40's, but for a v-tail on slower race planes, they should work fine.

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RE: V-Tail Linkage Tip - 2/4/2008 5:49:42 PM   
fizzwater2


 

Posts: 800
Joined: 8/16/2004
From: Paola, KS, USA
Status: offline 		I'm wondering if they're similar to the old 3021's that JR had? I've been using them, with good luck, on the halves of the v-tail.

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RE: V-Tail Linkage Tip - 2/4/2008 7:21:26 PM   
ChrisAttebery



Posts: 375
Joined: 9/15/2004
From: Gilroy, CA, USA
Status: offline 		I use the same basic setup, but substitute Flex CA for the 5 minute epoxy. A guy on another forum turned me on to this. To test it he actually hamered the glued in end into a pine block. The carbon tube splintered before the glued end broke free.



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WM T-34 - OS 46AX - Club racers
Rusty Miss Ashley - Nelson Q40

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RE: V-Tail Linkage Tip - 2/4/2008 7:38:10 PM   
daven



Posts: 6909
Joined: 12/7/2001
From: Andover, MN, USA
Status: online 		Chris,

Is the glue you use similar to black flash, ruberized CA, or tire glue? I've used that in the past, and it works fine just less time to get everything lined up perfect. Also, I didn't use that type of glue very often and it tended to go bad relatively quick after opening.

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RE: V-Tail Linkage Tip - 2/5/2008 3:54:17 AM   
PylonDave



Posts: 201
Joined: 5/8/2006
From: rancho cucamonga, CA, USA
Status: offline 		Dave , I had a salesman at horizon tell me that the MN48 is in fact the same servo as the expert sl 451 , just with JR's name on it.

(in reply to daven)
       Post #: 8

RE: V-Tail Linkage Tip - 2/5/2008 11:58:36 AM   
Lotus72D


 

Posts: 626
Joined: 2/11/2002
From: Endicott, NY, USA
Status: offline
quote:

ORIGINAL: PylonDave

Dave , I had a salesman at horizon tell me that the MN48 is in fact the same servo as the expert sl 451 , just with JR's name on it.


I've run 12 of these servos in 4 quickies and they perform well, they certainly seem to center better than the Hitec 225's I used to run. These are 424 models, I can't comment on using them in anything faster.

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RE: V-Tail Linkage Tip - 2/5/2008 4:12:51 PM   
PylonDave



Posts: 201
Joined: 5/8/2006
From: rancho cucamonga, CA, USA
Status: offline 		I used them on a 428 all last year.
Although one of the original MN48s went bad after a couple of flights . I replaced it with another one and have had no problems since.

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RE: V-Tail Linkage Tip - 2/5/2008 4:28:58 PM   
ChrisAttebery



Posts: 375
Joined: 9/15/2004
From: Gilroy, CA, USA
Status: offline 		Dave,

Yes, it's the rubberized CA. The bottle I have says "Flex CA". I've been beating on the set I made for my OMP Edge doing Blenders and similar tricks and they're holding up great. Matter of fact the ball links are getting sloppy from the vibration of the Saito 82. I'll probably have to replace the ball links this season, but the rods will remain the same.


Chris

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WM T-34 - OS 46AX - Club racers
Rusty Miss Ashley - Nelson Q40

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