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Balsa USA Super Cub Build

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Old 12-22-2006, 04:54 PM
  #76
Tony Hallo
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Default RE: Balsa USA Super Cub Build

And here's the full scale version.
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Old 01-08-2007, 08:22 PM
  #77
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Default RE: Balsa USA Super Cub Build

It's been a while since I posted any updates. After much debate we decided to install pull/pull on the ailerons as the full scale counterpart. I wasn't very happy with the access hatches I made for the aileron and flap servo so this was also a good time to correct these. The kit provides aluminum covers for the wing to simulate the wing fuel tanks so I decided to provide servo access under these covers, both the flap and aileron servo will be mounted near the root. Three CB Associates pulleys are used to direct the cables to the aileron servo. The control horns are fabed out of 18 gauge sheet steel and drilled like the full scale. Dubro 1/4 scale turnbuckles are used. The fitting on the control horn is a Dubro rod end turned down to simulate the full scale version, once the plane is painted, the turnbuckles will be locked in place with tie wire.
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Old 01-08-2007, 08:32 PM
  #78
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Default RE: Balsa USA Super Cub Build

Tony , Thanks for the pics . I have been contemplating the same modifications to my aileron and flap controls .
I am wondering where you got the cable pulleys and are they close to scale in size (mainly regarding the exposed part).
Please keep up the posts they are inspiring.
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Old 01-08-2007, 09:09 PM
  #79
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Default RE: Balsa USA Super Cub Build

The pulley will get covered with a cover as shown in the attached photo, also shown is a PDF of the cover installation. Thanks.
Check with Mark's Hobby Warehouse in Pittsburgh, PA he may have more in stock,
412-68RCFUN
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Old 01-08-2007, 09:20 PM
  #80
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Default RE: Balsa USA Super Cub Build

Here's some photos of the bottom of the wing. The flap control horn is moved to the flap hinge pocket. The original horn location is also shown in the photo.
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Old 01-08-2007, 09:27 PM
  #81
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Default RE: Balsa USA Super Cub Build

Here's a photo of the full scale flap control horn.
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Old 01-11-2007, 06:11 PM
  #82
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Default RE: Balsa USA Super Cub Build

While traveling on business today through Carmichaels, PA I stopped off at Brodak's Hobby Shop (The control line guy) and found a NOS set of Dubro 1/3 scale Cub wheels. These are the pneumatic style that's out of production. Even have the Goodyear name on the side and 8.00 x 4 markings. This will be a nice addition to the Cub. The tires provided with the kit (Right side of the photo) are foam filled and have a tacky glossy finish, the pneumatic tires look like the real thing. The packaging was faded and the original price was $30.80, they were marked the price down some time ago to $24.84 and I got 10% discount on top of that, not a bad invesment for $23.00! I bet they were happy they finially disappeared!
Where did the spell check go?
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Old 01-11-2007, 09:24 PM
  #83
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Default RE: Balsa USA Super Cub Build

The flap linkage is complete on the right wing, now I need to go back over the left wing and install the current control system, remove the previous installed hatches and redo the bottom cap strips in those areas. The wings are nearing completion and it will soon be time to marry the wings to the fuselage and fit the lift struts. I have ruled out metalic streamline tubing and will use the kit supplied spruce pieces. I'm brainstroming a differnt attachment method for the connections at the wings, any ideas out there?
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Old 01-11-2007, 09:30 PM
  #84
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Default RE: Balsa USA Super Cub Build

When using the scale aileron hinge kit From Balsa USA the gap between the wing and the aileron/flap is rather excessive when done per plans. The instructions have you install a triangle shaped filler on the trailing edge. On the full scale, a formed alumium end cap is fitted to fill the gap.
I added a 3/16" filler piece and sanded a radius to close the gap.
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Old 01-11-2007, 09:38 PM
  #85
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Default RE: Balsa USA Super Cub Build

Here are photos taken of the trailing edge on a J3 Cub.
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Old 01-11-2007, 09:55 PM
  #86
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Default RE: Balsa USA Super Cub Build

To keep the wings off the workbench surface I made up these stands. The wing rests on the spars in the open bay area, the wing can be mounted from either side while working on it, when doing work like sanding, I use paper clips to hold the wing in place. I need these because the top of my bench is normally rather messy. I expect it will be a week or two before I finish off both wings, signing off until then.
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Old 01-25-2007, 01:59 AM
  #87
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Default RE: Balsa USA Super Cub Build

jumping into this thread.
our kit just arrived yesterday.
many future question!!
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Old 01-25-2007, 10:10 PM
  #88
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Default RE: Balsa USA Super Cub Build

Great, I hope I can help.
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Old 02-10-2007, 06:36 PM
  #89
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Default RE: Balsa USA Super Cub Build

Well I decided to use the original design for the upper strut connection, just couldn't come up with a better method, hopefully tomorrow I will get the fuselage back on the bench and finish off the bottom connection. The light is getting brighter at the end of the tunnel, I mignt be half way through. Till then.
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Old 02-18-2007, 09:17 PM
  #90
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Default RE: Balsa USA Super Cub Build

Here's the strut connection at the fuselage, I made aluminum inserts tapped for 6-32 to receive the fork fittings. On the od of the inserts I machined a 40 threads per inch thread about .010" deep for the epoxy grab hold of. I used a mixture of 3 hour exopy and milled fiberglass to glue the inserts in.
I really didn't like the way the wing end connections came out so the next day I re-did them. I was talking with a friend a flee market and we were talking about the strut fitting on a plane he was building so I borrowed his design. A 1/8" brass tube is wrapped with .025" sheet steel, I was able to bend it around the tube and get a good fit. This was done in vice. The assemby was soldered together. The struts were saw cut down the center line to receive the end fitting. The fitting is held in place with #4 flathed screws and a mixtrue of epoxy and milled fiberglass
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Old 02-18-2007, 09:21 PM
  #91
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Default RE: Balsa USA Super Cub Build

Here's a photo of the full scale.
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Old 02-18-2007, 09:28 PM
  #92
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Default RE: Balsa USA Super Cub Build

For the jury struts I made up scale fittings and replaced the orignal spruce jury strut with K&S streamlined tubing. The band is made from .025" sheet steel and center clamp is constructed as was the wing end fittings, 1/8" brass tube wrapped with steel and soldered.
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Old 02-18-2007, 09:35 PM
  #93
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Default RE: Balsa USA Super Cub Build

Full scale photos of the jury struts.
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Old 02-20-2007, 07:16 PM
  #94
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Default RE: Balsa USA Super Cub Build

just wanted to know if you have any contact info for the "scale" tailwheel,i tried to lok up the company name and came up with nothing...i am enjoying your build thread and hope to see more soon, i am currently building a 1/4 cub and a scratch b29-130" span. you are giving me some great ideas by watching your build.
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Old 02-20-2007, 11:08 PM
  #95
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wolfinwisconsin

Try Mark's Hobby Warehouse 412-68rcfun, I'm sure he can get you one.

I'm at the painful stage of fitting everything together and final sanding, I'm not happy with the wing to fuselage fit so I'll be spending the next few days resolving this issue. I might just cover the wings soon, I will use Stits products for final covering and finish. I'm glad to hear someone is reading this post.

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Old 02-20-2007, 11:25 PM
  #96
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Default RE: Balsa USA Super Cub Build

Hey Tony,

Wolf is not the only one reading. I am building the RCM Supercub (May 98) enlarged to 1/5th scale (84" ws) and watching your thread to see if you have any hints that I can apply to my model. Thanks for starting the thread.
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Old 02-20-2007, 11:57 PM
  #97
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Default RE: Balsa USA Super Cub Build

Don't worry. You have plenty of people watching!! I can't wait to see the finished product. Amazing build so far! If I ever gather the guts to do a scale project, the cub is the way I would like to go.
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Old 02-21-2007, 10:15 AM
  #98
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Default RE: Balsa USA Super Cub Build

i am also watching this thread because i am scratch building a 1/5 scale super cub off of the sig 1/6th scale plans (and yes i ment 1/6 scale) and i hove found some of you info invaluable.
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Old 02-25-2007, 10:38 PM
  #99
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Default RE: Balsa USA Super Cub Build

Well it's time to start covering, I could of waited a while before covering but I just wanted the plane to look a little different. I kind of getting tied of looking at it. The Stits covering when on just like the video. The most difficult place was the concave area at the trailing edge, it took a while to get the hang of things as this is the first time I have used this covering. The nice about Stits, if you make a mistake, just clean it off with MEK and start over.
Cut the covering to size, brush on the Poly tac at the perimeter, and stick it down. I only able to work on 8"-10" sections at a time before the Polytac dried out to much. This slows the progess somewhat as I had to wait a little while for the Polytac to grab before I could move on. It took about 4 hours to get to covering tacked down and another two hours to shrink it and apply a coat of Polybrush on the solid areas and the ribs.
The next coat of Poybrush will get sprayed, then stitching, tape, final coat of Polybrush, coat of Polyfill, and paint.
The wing is covered with one piece of covering, it get tacked down at the trailing edge, wrapped around the leading edge, tacked at the wing root and tip. The covering is allowed to crawl around the trailing edge when shrinking. The covering is not cut where the wing strut fitting are located until the fabric is shrunk, a little differnt from the normal iron covering process.
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Old 02-28-2007, 05:20 PM
  #100
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Default RE: Balsa USA Super Cub Build

Production has increased somewhat, the video from Stits instructs you to thin the Polytack by dipping the brush into MEK before dipping into the Polytack. The second wing I tried straight out of the can and found without thinning I could move along much quicker. Second wing is covered, might be down to 4 hours on this one.
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