Ron101

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Hey guys I might have a lead on one of these kits. Thought it might be fun to build and convert to electric.

After reading this thread, is this plane safe to do basic aerobatics? loops, split s, cuban 8's in it's stock form...
or is the center section on the wing not strong enough?

SteveD-RCU

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Not safe Ron;But you can add a wing tube like I did and then you can do anything you want.I peeled a wing off my first 1/3 BUSA Super Cub after loading some negative G's on the wing.
Steve

Ron101

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Thanks Steve
Great looking cub you have there. Did you find the mod hard to do or not to big of a deal. Just looking at what you did look simple...
but I'm not sure if the wing has dihedral.... where did you source your tubes if you don't mind?

TripleDeucer

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Hey Steve, your Cub is very nice. I love the ski picture. I'm also building a 1/3 BUSA and am at the stage that I can still add the tube. Would be interested in the source for the tube and socket also.

SteveD-RCU

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http://www.tntlandinggear.com/store/...ne_catalog.htm
I got pretty fast service from these guys..Yes there is dihedral in the wing Ron,I forget now how much.

SteveD-RCU

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here's a link to my build on RC Canada. http://www.rccanada.ca/rccforum/show...t=95441&page=5

Ron101

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Thanks again steve
I will take some notes

that's why these sites are so great....you may have saved my plane for ripping apart

Ron101

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Hey Steve,
Hate to be a pain... but from the looks of your build you didn't pre drill the holes in the ribs for the wing tube.
How did you drill them afterwards?

I love that idea, just not sure how to go about it... I bet it helps setting up the plane to

if you have any tips on how to drill the ribs that would be great

thanks

Ron

SteveD-RCU

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Ron I didn't predrill them ,I already had built the wings when I decided to add the wing tube.Once I figured out were the tubes had to be with the dihedral I cut the holes using a hole cutter.I cut the holes oversized which in turn gives you some play to make final adjustments.I think I used a 1 1/2 hole cutter(with an extension) and then used a slightly larger drum sander.(I just added sticky back 80 grit? paper that Tower sells and wrapped it around the hole cutter).Once you have your tubes inserted you assemble the whole plane using clamps to line everything up.On a level surface you level the plane,then you prop up your wing tips to the proper dihedral.Once everything is lined up you can epoxy(45 min or longer type) the tubes in place using the 1/2" balsa blocks on each side of each rib.
Figuring out where the holes go involved;mounting the wing on one side only,set the dihedral,and using the carbon fibre inner tube ,inserted through the fuse,through to the wing to mark the location for the next rib to be drilled.Once you have 2-3 holes drilled you know where the rest will go and you can pull the wing off and continue drilling holes.Its time consuming but it works.You can see in the pics were I added additional wire braceing across the top in the cabin instead of those dowels.Very stong setup,you can do loops and spins all day with this ..hope that helps Ron

Ron101

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Perfect Steve!!

Thanks so much, that sounds straight forward enough to me. That was a great idea and will really give you some piece of mind when your doing some tricks.

It's great that this info is now in this thread

Ron

SunDevilPilot

My friend Ron is also building the Balsa USA Super Cub and has opted to add some wing tubes. I got to help a little with the process.  Here is a link to what we did.