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More Chimpunk wing jig woes

12/15/2020

1 Comment

 
So I have the wing on the jig.  But there is a problem.  First of all the jug seems to be not real solid.  Second of all the ribs are all over the place as far as spar notches.  

Wing jig first.  An adjusto Jig uses 3/4" emt conduit to hold the rib fixtures and that conduit is drilled and tapped to a 1x1 1/2" aluminum tube.  The tapped holes in the conduit.  The conduit is thin and the treads wore barely holding on. Getting the conduit to stay in place isn't easy .  For this build I am getting by with some tread locker.  

Before next build I am going to replace the conduit and put threaded inserts into the holes so it has some treads to grab on.  


    Engine selection

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The chipmunk is good value and a great airplane but I am spoiled now by modern CAD based  designed.  The spar slots need trimmed and shimmed to get good alignment. 

The wood density varied to very hard to only slightly hard.  The very hard wood was right on the ribs that hold the gear blocks so that is where you would use real hard wood. bottom side Trailing edge sheeting held on with weights 

Now the real advantage of the jig, I can flip it over and keep everything in place 
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1 Comment
David W. Felinczak
12/23/2020 07:25:29 am

I also use a adjusto jig and and am interested in your solution. The emt conduit does not hold a consistant level during the build which if not corrected leads to problems you desctibe.
Your solution is a very good idea and I would appreciate a photo or two of your fix.
A recommendation that I want to do with mine is to replace the plastic triangle side mounts with 3D printed triangles.
The Chipmunk wing builds like the Brodak Aldrich Nobler wing.

On your engine selection, I would use a BB engine however the TL ST .46 is a little much for the Chipmunk. I would stay away from the Foxes due to weight. The engine mount compartment does not give much room.
The stunt tuned OS FP .40 would be my choice even though it is a plain brg. engine.
Flew mine with a Brodak .40.

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  • home
  • About Circle Masters
    • World Wide visitors
    • Club Contest
    • About the Club
    • Event Calendar
    • Club Events >
      • Building contest 2019 >
        • Building Contest 2017
      • MECA
      • Library Static show and open house 2014
      • Steam Show
      • Town Of Lisbon Fun Fly
      • Kidventure
    • Awards
    • Club Meetings
    • Membership and Contact information
    • Flying Location >
      • Dan Tetzlaff Flying field Dedication
  • Newsletters
    • 2021 Club Newsletter
    • 2020 Club Newsletter
    • 2019 Club Newsletter
    • 2018 Club Newsletter
    • 2017 Club Newsletter
    • 2016 Club Newsletter
    • 2015 Club Newsletter
    • 2014 Newsletters
    • 2012- 2013 Newsletter
    • 2011 Newsletter
    • 2010 Newsletter
  • About control line
    • Wikipedia Page on control Line
    • Control line overview
    • Getting Started
    • Control line Tutorials From Brodak
  • Pictures/ Videos
  • Videos
  • privacy_policy
  • Dave's blog
  • Plans page
  • Administration
  • Chris's blog
  • meetings