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Old 01-11-2020, 08:00 PM   #1
NEW222
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New To Me Cub!


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So recently I had purchased a biplane and really liked it. But after taking a few moments, I came to realize that a biplane would probably be a bit much for me at this stage of the game of learning to fly nitro RC planes. So I had decided to try and trade it for something I have always wanted. A Cub. This being good, im my opinion and please correct me if I am wrong, as I get something I have always wanted, and personally think it would be easier to fly than a biplane. So a friend offered up a Sig 1/6 Clipped Wing Cub. It has never seen any nitro as it was built for electrons..... I have a small repair to make on the wing first. It was built with seperate ailerons in each wing half. Also it was originally all covered in fabric and painted, but the wing was redone and covered in film now. The only other thing is that it does not have wing struts on it or built into it. But my friend has flown it with a Power 46 I believe without any problems, so I am not too worried. So now for a bit of repairs and figuring out what engine to put in it. My OS FS-48 Surpass, or a .45 two stroke? Decisions, decisions.....
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Old 01-11-2020, 08:43 PM   #2
Frank Klenk
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Re: New To Me Cub!

If the wing is one piece it will fly just fine minus struts. The OS 48 will fly it scale like and you will enjoy it.
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Old 01-11-2020, 08:56 PM   #3
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Re: New To Me Cub!

Yup, better to learn on than the biplane for sure. Dump the 48 four stroke into it. If you want the struts, they would be easy enough to make.
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Old 01-11-2020, 09:30 PM   #4
NEW222
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Re: New To Me Cub!

Thank you for the recommendations. Not looking for anything crazy, just a fun flier, so after a bench run, I will then put in the FS-48! Just doing a couple of wing repairs right now, followed by removing a warp in the wing as well. Also glad for confirming that this would have been better for me than the biplane. Makes me feel better and more at ease now.
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Old 01-11-2020, 09:34 PM   #5
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Re: New To Me Cub!

The 48 will haul that thing around no problem and you'll probably spend most of your time at half throttle.
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Old 01-11-2020, 10:39 PM   #6
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Re: New To Me Cub!

Quote:
Originally Posted by Frank Klenk View Post
If the wing is one piece it will fly just fine minus struts. The OS 48 will fly it scale like and you will enjoy it.
Sorry Frank. I disagree. If I am not mistaken, the SIG cub had a flimsy(and short) plywood main spar and the struts were functional. The wing on the Goldberg Cub, on the other hand is super strong and that one does not need the struts.

If it is indeed the SIG cub, make sure you use the struts.
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Old 01-12-2020, 12:06 AM   #7
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Re: New To Me Cub!

Not familiar with the 1/6 design, I did some searching and it's similar to the 1/4 scale version I'm working on and I wouldn't fly the 1/4 scale version without them. Searching online, the general consensus across many forums is that the struts on both the 1/6 and 1/4 scale designs are functional. Short story, fabricate some struts.
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Old 01-12-2020, 02:28 AM   #8
NEW222
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Re: New To Me Cub!

Ok. Thanks for the info on the struts. Unfortunately, it did not come with either the plans or struts, so I will have to try and figure something out for them if I am to build or fabricate them. I was just going by my buddy showing and telling me that it was flown very safely without them. But I would definately like to keep this bird in one piece, so will build them or such if necessary. I just would need to figure out how they look, and also how and where to mount them properly. Looking like I will have to call Sig and see how much for a set of plans. But if memory serves, the plans were not badly priced, but the shipping was a fair amount more. I wish the did the plans in digital format! Thanks again to all for your time and help. It is greatly appreciated.
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Old 01-12-2020, 08:46 AM   #9
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Re: New To Me Cub!

Regardless of experience level I would recommend adding some contrast to the top of the wing, either stripes or decals. Allows for much a much better idea of orientation in the air.

NOTE: I recommend the wing top as I find most turns have that facing towards you.
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Old 01-12-2020, 08:52 AM   #10
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Re: New To Me Cub!

Quote:
Originally Posted by NEW222 View Post
Ok. Thanks for the info on the struts. Unfortunately, it did not come with either the plans or struts, so I will have to try and figure something out for them if I am to build or fabricate them.

It wont be hard to reverse-engineer them if the plywood strut mounts were installed in the wing when it was built. If they are there, then cut some 1mm aluminum or brass strips and them mount them onto the wing mounts and fuselage. Assemble the wings to the fuse and measure the distance between the mounts from the wing-fuse. Cut some dowel to length, cut a slot into the dowel and epoxy the strips onto the ends. Bind with string and paint and you are all set.


Quote:
Originally Posted by NEW222 View Post
I was just going by my buddy showing and telling me that it was flown very safely without them. But I would definately like to keep this bird in one piece, so will build them or such if necessary.
I am surprised it stayed in one piece. If your friend just flew it gently, then I guess that's why the wings stayed on. A steep dive with a hard pull-out at the bottom would have definitely folded the wings.

Check out this picture to see what I mean.
The front and rear spars are just a single piece of plain balsa. The Sig design does not use the stronger method of upper and lower spar with shear webbing.

The only joiner between left and right wing panels is a piece of ply at the very front of the wing. In this picture, it is not installed but it is shown on the drawing at the top right corner of the wing. You can see how short it is within the wing


I'm not sure if you can see on the photo where the strut mounts are. There are 4 in total in each wing panel. 2 are in the same rib box where the aileron bellcrank is mounted. The other 2 are half-way between the root and the aileron bellcrank.
Hopefully they were glued into place when the wing was built.

Good luck, and if you are stuck, ask here. I'm sure there are a lot of cub builders on here. Everyone who has flown RC for any period of time has had a Cub at one time or another
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Last edited by Max; 01-12-2020 at 09:52 AM. Reason: typo
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