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Vintage Sig 1/6 Cub Build

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Vintage Sig 1/6 Cub Build

Old 01-24-2011, 12:30 PM
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scigs30
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Default Vintage Sig 1/6 Cub Build

Back in the 80s when I was a teenager I was lucky enough to save enough money and buy the 1/6 scale Sig Cub. I had built freelight models and some RC birds so I figured I was ready. This kit was built per the plans using Elmers Glue All for 90 percent of the build unless Epoxy was called for by the plans. The build was pretty easy almost like a jumbo size freeflight model. I liked covering with Monokote but wanted this bird to look like the real Cub. So iron on fabric was used, but I don't remember what it was called at the time. For some reason I thought it was made by Monokote, but I don't remember. The best part is the paint job, it was painted with the old U formula Cub yellow right out of the spray can, so not the best paint job in the world. This was kept at my Uncles house since the early 90's and I forgot all about it. Also he has my Goldberg Piper J3 Cub I built and that is all done covered with Monokote. That one is going to be displayed the the LHS. So when he asked me if I wanted this back, I said sure and picked it up this morning. It was dusty and the Top rear Longeron was cracked, so I fixed the longeron and used the heat gun to shrink the wrinkle out. I have no idea were the cowl is, so I will order another from Sig. Also the struts have not been started so I will work on them. The hardest part is going to be matching the Cub Yellow but I will do my best. I see some sanding flaws, but oh well I was young. This bird is doing pretty good for being over 20 years old. I have not decided if I am going to make it electric or put a Gas engine on it.....What do you all think? Right now as shown it weighs 2.3 lbs, not bad for such a large bird. Another issue is the fact I did not make a spot for the push rods to exit, probably because it does not show any on the plans.....any thoughts? Someday I will build this again and the Clipped wing version, I have both in their boxes still. Also I will build the Herr Cub and Great Planes Cub next.....Yes I love Cubs. My final plan is to build the 1/4 or 1/3 scale Cub when I have a bigger place to build.
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The Metal Wire is poking through the covering.......OOOps.
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Old 01-24-2011, 04:04 PM
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morganflyboy
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Default RE: Vintage Sig 1/6 Cub Build

Hello
Nice looking Cub, if you want to match the paint and you don't mine using latex paint. Take a sample to Home Depot or Lowes and they will match it. I shoot it thru an Air brush, and the best part is NO Smell. I also fly Cubs 40 clipped, 60 full wing, 1/4 clipped,
BUSA 1/3 Super Cub, BUSA 1/3 J-3 and a 1/3 J-4 coupe. Love my Cubs

Morgan
Old 01-25-2011, 07:35 AM
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ARUP
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Default RE: Vintage Sig 1/6 Cub Build

You'll be flying before long! Nice!
Old 01-26-2011, 06:17 PM
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tailskid
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Default RE: Vintage Sig 1/6 Cub Build

You did an excellent job! And that kit is a BUILDER!!!!

Interested in a 1/3 cub by Byron? Never finished but am willing to part with it cheap.....
Old 02-01-2011, 08:49 PM
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scigs30
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Default RE: Vintage Sig 1/6 Cub Build

I have been busy with the Sig Cub, and she is almost done. I am leaning towards adding a fuel engine and my next two Sig Cubs will be electric. My question is what would be a good set up with the plane? I did not move the firewall back when I was building it, so I only have so much room. I have 2 3/4 inch from the firewall to the tip of the nose. I am looking for a slow easy flyer with no stunts or nothing fancy. Any good recommendations? I was thinking a .25 2 stroke mounted on its side.
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Old 02-02-2011, 03:12 AM
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Default RE: Vintage Sig 1/6 Cub Build

An O.S. .40 4 stroke is a very nice match. I have built a couple of these and just love this plane. Since it is old school technology moving the firewall back is a very good idea. Have you considered electric?
Old 02-02-2011, 06:32 AM
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scigs30
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Default RE: Vintage Sig 1/6 Cub Build

I don't think a 4 stroke will fit in the cowling without moving the firewall back, and I really don't want to mess with that task so I am hoping there is a short enough engine out there. If I cannot make it happen, then I will go electric.
Old 02-02-2011, 07:02 AM
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Default RE: Vintage Sig 1/6 Cub Build

No the 4s will not fit without moving the firewall. You should be able to get the 2s in there though.
Old 02-02-2011, 08:29 AM
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Default RE: Vintage Sig 1/6 Cub Build

I was looking at the OS 25 it is 2.66 inches long, so inverted it should fit but it will be pretty close to the firewall. Also trying to figure out what to do with the muffler,linkage and so forth. I searched the internet for this type of set up and no luck. I am sure there is a picture somewere of this exact set up, just have to find it.
Old 02-02-2011, 08:45 AM
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Default RE: Vintage Sig 1/6 Cub Build

Congratulations on the beautiful build and the light weight! It's hard to see this going much over 4 pounds, which means you do not need a 40 size engine. You could fly this on an OS 26 or 30 four stroke.

I just checked my 26 and it is 3 1/4 inch from the back of the engine to the thrust plate. You would need a little modification of the firewall to make it work. I would cut a hole, mount a slightly recessed firewall to the back of the existing one, and mount the engine at 9 o'clock. The OS carb is not reversible, so you need a needle valve extension to come out the bottom. Not ideal, but not too hard. You would need to cut the motor mount to allow the engine to go back as far as possible. You would need a little cutout on the side where the carb is, but it would not be very much. I presume the OS 30 would mount the same way.

Alternatively, you could use a 2 stroke that can swing a larger prop than normal, and is short. That would mostly be older engines. My K&B .20 Sportster, after a careful break in, is perfectly happy chugging away on a 12x4 prop. If it's not enough power, switch to 11x4. The old OS 30S also had a reputation for swinging large props. My Enya 30ss can swing an 11x4 and is very powerful on it. The older 35s could do that too. You can get a Pitts strap-on muffler from Mecoa and mount the engine at 9 o'clock. The Enya 30ss will take a Slimline or Bisson bolt on.

Jim
Old 02-02-2011, 12:12 PM
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Default RE: Vintage Sig 1/6 Cub Build

Yes very nice Cub! I built a Sig Cub back in the early 80's also. It is a great first time scale build. I covered it with silk and clear dope and finished it in Sig Cub yellow dope. I had a Fox .40 in it with a 12/6 prop. That made a fine flywheel and that engine just putted along just fine.- Until- One day while performing a giant loop the wing snapped in the center and the rest turned into a lawn dart!
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Old 02-02-2011, 01:01 PM
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Default RE: Vintage Sig 1/6 Cub Build

I didn't know the Fox 40 would swing such a large prop...must have sounded nice! It's short front to back, too, which makes it a good fit.

I know there are some engines that just won't tolerate over-propping. My Enya 19 V overheats with anything over a 9x4. So you have to pick one that you know will do it. Or put in a head shim, or a cool plug and/or low nitro fuel.

There's no reason why two strokes can't swing props as big as comparable four strokes. As long as the engine is not over-compressed, it works well. It won't sound like a four stroke, but two stroke engines do sound better and quieter on large props.

Jim
Old 02-14-2011, 01:05 PM
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scigs30
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Default RE: Vintage Sig 1/6 Cub Build

I recieved some parts from Sig so I am able to move forward on this build. I put the cowl together and will prime and paint today and tomorrow. I am mounting a OS .25, like I said, I don't know if I will ever fly this bird. I ordered another one of these kits and a Clipped wing as well. Sig is out of stock and these kits won't be in until after April, balsa shortage. I really like this kit and I wouldn't be surprised if Sig stops making it. The 1/5th Cub is real nice, but there is just something about this kit. Anyway still have to make the struts, mount the engine and apply the Black Bolt.







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