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Curt Thompson
Joined: 09 Jan 2009
Posts: 18
Location: Redmond, WA, USA
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 Posted: Wed Jan 13, 2010 8:32 pm Post subject: My Torque Tube mods |
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I think I’m nearly done with my 7C2-2 torque tube mods to create a stationary horizontal tail bellcrank (7C1-1). Still need to paint. Here is a link to some pictures of it:
http://s231.photobucket.com/albums/ee150/charlievictor102/CH701%20Modified%20Torque%20Tube/
The password is “airplane”
Here is what I did:
1. I cut the Torque Tube (7C2-2) in half and trimmed off about 20mm from the rear end.
2. I replaced the Rear Torque Tube Bearing (7F6-2) with an equivalent piece of 4130N 0.050 sheet.
3. I welded the rear part of the cut Torque Tube to the new steel 7F6-2.
4. I machined a new tube that fits inside of the Torque Tube. Using the lathe I turned down a 4130N 1.125”x0.083”x0.959” tube so that it fitted inside the Torque Tube. I had to use some valve lapping compound to knock off the bumps from the welds in the Torque Tube.
5. At the rear end of this inside tube, I welded a new place similar to 7C2-3.
6. I machined a nylon spacer to go over the inside tube.
7. When the assembly is put together, the inside tube is bolted to the front part of the original Torque Tube.
8. I made a new Pitch Control Rod (7C1-3) so I could attach CW-5-12 rod ends to both ends.
So now when the control stick is moved left/right the location of the Horizontal Tail Bellcrank (7C1-1) does not move. I should be able to keep the elevator cables pretty tight and not have the tightness change as I move the aileron. Also, I should not have to worry about the cables interfering. All academic at this point since I haven’t actually flown it yet.
Thanks to Robert Pelland who posted pictures here about a month ago. I got some ideas from his pictures.
Curt Thompson
Plans Building CH701
Redmond, WA, USA
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stepinwolf
Joined: 21 Jan 2008
Posts: 133
Location: Canada
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| Posted: Thu Jan 14, 2010 5:24 am Post subject: My Torque Tube mods |
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Curt,
I am happy to see that the photo's I posted were of help to you. However I must add that the modification you have just made, is much better then the original photos I sent you. Great job,,  )
Robert Pelland
[quote] ---
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_________________
Long wing + vga's, = lo & slo |
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n752ms(at)softcom.net
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| Posted: Thu Jan 14, 2010 5:28 am Post subject: My Torque Tube mods |
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Curt.
Airplane doesn't get me in.
Mark S.
Do not archive
[quote] ---
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stepinwolf
Joined: 21 Jan 2008
Posts: 133
Location: Canada
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| Posted: Thu Jan 14, 2010 5:35 am Post subject: My Torque Tube mods |
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Mark,
Check your "caps lock" or spelling, since " airplane " got me in just fine.
Good luck
Robert
[quote] ---
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Long wing + vga's, = lo & slo |
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Curt.Thompson(at)verizon.
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| Posted: Thu Jan 14, 2010 7:42 am Post subject: My Torque Tube mods |
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Thanks Robert. I was thinking about how to do this before I saw your pictures. What I had in mind was a lot more complicated than what you had.
One change that I wish I had made to mine was to tilt the tail bellcrank a few degrees CW (looking for the rear). This would keep the elevator cables a little further apart.
Curt
From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of Robert Pelland
Sent: Thursday, January 14, 2010 5:23 AM
To: zenith701801-list(at)matronics.com
Subject: Re: My Torque Tube mods
Curt,
I am happy to see that the photo's I posted were of help to you. However I must add that the modification you have just made, is much better then the original photos I sent you. Great job,, )
Robert Pelland
[quote] [b]
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