Bigbird Swept Wing - Page 2 - RC Groups
Thread Tools
This thread is privately moderated by argo-2, who may elect to delete unwanted replies.
Apr 23, 2012, 08:37 PM
Sometimes it work some don't
RCSquale's Avatar
Nice job, looking forward for further progress!
Sign up now
to remove ads between posts
Apr 29, 2012, 05:51 AM
argo-2's Avatar

More build log added.

Please see here for more build progress...
May 07, 2012, 06:01 AM
argo-2's Avatar
Progress and experimentation.


1/ Polycarbonate end-caps cut out, place over wing-root (taped) and then sanded to shape.

2/ Needle-marker made form music-wire to find joiner centres in end-caps.

3/ Joiner centres marked and drilled out.

Experimentation to test Coro hinging, torque-rod and flex over aileron length.

1/ Found when using torque-rod (rather than horn) and hinging using Coro itself as a hinge, not so nice movement. This is because the hinge line is not central to rotation of torque-rod. The torque-rod has to twist as aileron moves. So I tried some plastic hinges I had lying around - they worked great and are easy to insert into the Coro. Just needed to make a hole in side of the Coro and push the hinge in - very easy. This also meant the hinge line is now central to the torque-rod rotation.

2/ Using some aluminium tube I made slider for the torque-rod end to slide in. This worked well.

3/ Tested this setup and it was very smooth.

4/ Made a jig to see how much twist there was when torquing the Coro aileron from one end. The Coro resisted twisting very well. I made a short video to demonstrate...

Coroplast/Corex aileron twist test. (0 min 17 sec)
May 08, 2012, 05:02 AM
argo-2's Avatar

Wing roots almost ready.

Drilled out weight reducing holes in the polycarb wing roots tonight. Used a step-bit & ceiling light/fan cutting tool cut ground down to make a sharp cutting edge, works great. Photos below of prepared wing roots and cutting tools used.
Last edited by argo-2; May 08, 2012 at 05:58 AM.
May 09, 2012, 05:18 AM
argo-2's Avatar

Aluminium wing joiner tubes glued into struts.

Not much to see. Aluminium tubes glued into wings. I glued these with 3M 90, spraying/smearing it onto the tubes, then spraying down into strut holes. Then with the music wire in the alum tube for strength, I pushed the tube into the strut holes quickly. The music-wire was then extracted.

Here's a photo with the caps sitting over the tubes and in the wings. Not glued yet.
May 13, 2012, 03:24 AM
argo-2's Avatar

Wing joiner testing & polycarbonate root-cap glued.

Thought I would jig up a test rig for the wing joiners. As always photos tell the best story. There was some bending but nothing to worry about. I'm going to fix the wings into the fus via a hex screw and landing gear collar. Idea is slide the wings in and then cinch the middle joiner via an Allen key through a small hole in the fus.

Also glued on both Coro root-caps and one polycarb root-cap.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Landing gear- Fun Jet/ Swept Forward wings? RCvertt Flying Wings 3 Sep 26, 2014 03:10 PM
Discussion deleted mixjsj Scratchbuilt EDFs 24 Jan 05, 2014 08:40 PM
Discussion Calculating MAC for twisted swept wings kcaldwel Nurflügel 127 Jul 11, 2013 07:54 AM
Build Log Forward Swept 36" Wing build log Dowquest Flying Wings 5 Oct 18, 2011 09:38 PM
Discussion Do KF airfoils work on swept forward wings? RCvertt Flying Wings 10 Oct 04, 2011 03:27 PM