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Full scratch Backcrountry SuperCub

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  • Member since
    February 2020
  • From: Normandy, France
Full scratch Backcrountry SuperCub
Posted by Optilium on Tuesday, May 12, 2020 6:16 AM

Hi ! 

I decided to start a new project at the beginning of the covid crisis: making a full scratch aircraft. I choose the bush aircraft Backcountry Supercub for its shapes

The beginning was quite tricky. I wanted to weld the frame, but Laiton and tin aren't really compatible, the global frame was really fragile, and some difficulty to get a symetric frame. 

I wanted to get a model as realistic as possible. With real tires, functionnal flight control and actuators, and respect the structure of the real frame. 

Actuator are made with spring. The main problem was the material resistance compared to the spring resistance. Here is the final result:

 

Flight controls were quite tricky as well. The main problem I had, was to find the neutral position and the yarn tension. At the end, the pitch and yaw controls are reversible, so i can by moving the stick make the rudder and horizontal plane move, but that's not the case for the ailerons due to high friction and the lenght of the wire

 

Flaps are controlled by a controller.

Cockpit:

Finally, the enfine, full scratch as well, and made only with styrene sheet and tubes. I choose the continental O-200. References were really easy to find on the internet

 

Next step, I have to add all the link between the engine and the controls, as well as every electrical wires. I also have to find a way to cover the wing. I tested the kraft paper, silk paper and aracover but for each one, the result wasn't really beautifull...

Do you have any other idea to cover the wing ? A special paper or something like that, adapted to small surface...

 

 

 

Check my gallerie for more: HERE

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Tuesday, May 12, 2020 9:11 AM

For covering silk is great for that size. It used to be very popular for RC and large free-flight models. It has been largely replaced by plastic for RC, but the free-flight guys still use it. It shrinks after covering, by wetting and slightly more when doped.

Where did you get reference drawings for the 0-200?  I have been looking for scale drawings to do some scratch engines.  Only lightplane engine I found was the C-40.  Have any idea of where to get R-2800 drawings?  That is what I am wanting badly to make.

In the scale you are working at, be sure to duplicate the rib stiching lines.  You wouldn't need to actually have the stiches, and the tape does not need to be pinked, but the layer of tape does show even after color painting.

 By the way, the model so far looks great!  I will be following this build.  Since you like civil aircraft, take a look at the civil aircraft forum just below the Aircraft forum.

 

Don Stauffer in Minnesota

  • Member since
    April 2003
  • From: USA
Posted by keavdog on Tuesday, May 12, 2020 10:44 AM

Wow - what a project!  This looks fantastic.  Putting the big bush tires on her?  I really like watching those STOL videos of those bush planes

Thanks,

John

  • Member since
    February 2020
  • From: Normandy, France
Posted by Optilium on Sunday, May 17, 2020 5:49 AM

Yep Don Stauffer. i finally tried a second time silk paper. The result is just awesome ! Propeller I'll show you soon. For the reference, simple photo taken on the internet. I didn't used any blueprints. That's too complicated and I didn't found any engine blueprints. I think howewer you have some reference about the R2800 but you have to pay, and not sure you'll find scale drawings...

Thanks Keavdog. I've found some tires which do the job, from aeromodelisme. I just have to build brakes system...

 

PS: I move the topic on the civil aircraft forum ! You're right don stauffer, it gonna be adapted..

Check my gallerie for more: HERE

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