[Guest]

Yup, there is!

[grosbeak]

Originally Posted by What Tree

Yup, there is!

Very helpful... thank you so much!

I ended up cutting the tubes between bulkheads. Some careful but firm twisting and pulling and they came out.

Tree, allow me to pre-quote you:

Originally Posted by What Tree

Told ya!

I used a rotary tool with a flexible cable to enlarge the holes I'll be using for the 4-40 tubes. I'm doing a dual pushrod mod so I'll fab up a couple of supports to attach to the bulkheads to route the dual tubes, which will be joined between the bulkheads like SportsFans at RCU did:


*Credit to SportsFans at RCU.

[Guest]

I knew you'd figure it out! I have a 90 degree drill that makes the job a lot easier. "Adaptability" is the next best expression to "TLAR"!

[grosbeak]

Lots of work done since then...

My switches came in from Valley View RC. Here they are, installed and labelled:




The elevator servo and linkage are installed...




I installed the aileron servos and joined the wing yesterday for a first-hand look at the size.




I added a step to the manual.



After another look, I'm going to redo the connection with longer heat shrink so that the connectors are really held together.



Here's another step that needs to be added - create a hole in the covering for the servo extensions! I had to do the same for the nylon bolt holes.




Next steps - connecting and installing the wing to centre the servos and hook up the linkages

[Guest]

Using a piece of black wire flattened with a hammer, then heat it with a torch or lighter makes a nice hole AND it will bind the covering on to the wood.

[grosbeak]

I used a soldering iron for that one - I've cleaned it up since the picture was taken.

[Guest]

Yup that works too, even better if you have that flat end. Assuming we're talkin' about an electric soldering iron.

[grosbeak]

Yes we are.

[grosbeak]

I had an elevator servo binding issue at both extremes (even with adjusted endpoints) and when returning to centre from both directions.



Last night I diagnosed the problem. Here's reference photo; below are the steps I took, checking after each to see if the problem was solved:

• Disconnect linkage from elevator control horns. Nope.
• Remove tubing from first to second bulkhead, leaving tubing flush with front of second bulkhead. Nope.
• Remove tubing from second to third bulkhead, leaving tubing flush with rear of second bulkhead. Nope.
• Remove tubing from third bulkhead, through fourth and to the exits. Nope.
• Enlarge holes in third bulkhead. Nope.
• Enlarge holes in fourth bulkhead. Nope.
• De-solder pushrod joint and try with main pushrod only. Yep.

I'm guessing that the path I chose for the pushrods wasn't straight enough and the friction of the bends caused the servo to bind. Joining pushrods to a single elevator servo is a common enough approach so I should be able to make it work without a second servo.

So now I'm faced with some choices...
Join the pushrods further back in the fuse to eliminate friction? Option 1.
Re-think the path of the pushrods? Option 2.


Your thoughts?

[Guest]

Option 3: Use 2 servos for the elevator.