This seemed to be the best place to post this.
Several years ago I built the Si 1/6 scale cub more or less stock. It had an old Magnum .40 and a pitts muffler. I recall it weighing around 5.5 lbs. I built it to be a trainer and I was finally going to learn to fly R/C with it. This plane is not a trainer. I got through, but the plane got a little rough. The plane eventually got a Magnum 30 fs and flew well, the engine was a good match for scale power. One day the wing came off during a roll around 400' up. I have pics somewhere. The fuse was destroyed from the aft cabin bulkhead foward. The wing was undamaged. I let it sit in a closet for a while and the rebuilt it a little over a year ago. It now had a Saito 40a, a jewel of an engine with plenty of power. I had always wished that it had a clipped wing, but I also wanted it to have flaps like a super cub. Sooooooooooo.........
I decided to build it a clipped wing, modify the long wing to have flaps, and modify the fuse and make a new cowling to turn it into a super cub. Here is the plane before any mods.

The Sig kit is IMHO the best of the 40 sized Cubs offered. It looks and flys better than the Goldberg one, however, the Goldberg one flies more like a sport plane, partially due to its higher wing loading. The Sig cub flies very scale like, even at the small scale, it is almost indistinguishable from the full size. But the kit has a few spots that I didn't like. Where the aft portion of the wing meets the fuse, it is flat, in other words, the wing center section is identical to the rest of the wing. I've included a pic for clarifaction. On the cub, the wing halves attach to the fuse, and the center is part of fuse. The turtledeck comes up to about mid-chord in the center. I wanted to try to simulate that on the one piece wing.

It would mean having to remove cover and build up the portion you want, but it's do-able. Raise the turtle deck to its appropriate height at the wing's trailing edge, and then match the profile on the wing by building up the center to match. The wing bolts might be slightly recessed by the time you're done, but you wouldn't have to touch the wing saddle or underside of the wing.

Its been awhile, I've been busy building and working.
Khodges, I ended up building up the turtledeck and the aft portion of the wing until I got the right shape. I cut some ply disks to give the wing bolts something to sit on. The quality of the pic isn't very good, but you can see the reshaped center section. The fuse sides havn't been built up yet, I'll do that when I rebuild the fuse.

I was also able to test fly the new clipped wing. On the full wing, the wingspan is 71" and the area is 700sq in, the wing loading on mine was 16.4 oz/sqft. I was able to make the clipped wing 6 oz lighter than the full wing, partly due to less wing, but also because of some lighter materials and lighter servos. Sig now offers a 1/6 scale Cwing cub, and lists its wingspan as 54". Mine came out to 52", with around 540 sq in. The wing loading is now 19.2 oz/sqft. It is a little higher, but still ok for a plane this size. With the long wing, it was quite a floater, and would take off in around 10 feet. It would also go SLOW, just about stopping in any breeze. It did have a tendancy to tip stall if you got it too slow and didn't use the rudder properly.
With the clipped wing, I was expecting the takeoff run to be a lot longer and the minimum speed to go up a lot. I also was curious to see its stalling habbits. I am happy to say that the clipped wing is much better behaved than the long wing. The takeoff run is now 15' and it just blasts off. Minimum speed is not appreciably higher than with the long wing, although it likes to be flown a little faster down final. The landing speed is almost identical and it still floats a bit on landing. The aerobatics are much improved, roll rate has of course gone up, but not as much as I would have thought. Knife edge was possible but difficult with the long wing but is now much easier, and is also sustainable. It is an altogether better airplane with the clipped wing. It tracks in a manner that I have not seen in a while and is very stable at high speeds. Of course, it is still a cub, so high speeds are relative! It looks and flies a lot like one of the short wing Monocoups.

This WILL NOT be another yellow cub. Yellow is a good color, but I want something different. As the pics show, it will be red and white. The long wing and fuse will be in a factory scheme for a PA-18. I have started work on converting the long wing to a -18 wing. The flaps are the first addition. They will not be true Super Cub flaps, but more like a Husky's. I will be using Robart hinge points and offsetting them 1/2" down and 1/4" aft of the flap line. This will simulate Fowler flaps but with a simpler mechanism. It is almost identical to a Husky's flaps. Not really scale but neat nonetheless. Check out
www.aviataircraft.com
http://husky.taildragger.info/photos/photos.php
for Husky pics. The Autocad screenshot is the flap extension process and the pic is the flap cut from the wing.

Beenie, the turtle deck looks great, brings the lines right where they should be. Flaps, especially the Fowlers you're doing, ought to make that cub drop like a stone at full set, What is the max degree they will go to? That's an interesting linkage, I may utilize it on my upcoming project, a 1/4 scale BirdDog, from Vaillancourt. They are Fowlers also, but don't move back very much as they move down. Robart makes a Fowler hinge set that you may have seen, I think they're a bit on the pricey side and may be too big for your scale, but the offset hinge points is a good alternative.

Even with the clipped wing, it's not gonna be any Extra 300 in the roll department. Too thick a wing, too much chord, not nearly enough power-to-weight. But it will still be fun, especially playing with those flaps. Keep us posted. Ken

Ken,
I don't remember the O-1 having fowlers. I remember them having an offset hinge also, very similar to the PA-18. They had some rediculous degree of deflection, it seemed like 80*, but was probably 50 or 60. The cub should drop in quite nicely with them, I also plan to have the ailerons drop 10 or 15*, or maybe go up for a crow configuration. Not very scale but it should be interesting. There is a Super Cub mod that drops the ailerons with flap application, so that will be scale. The full deflection of my flaps will be 45-50*, 1-1/2" or so of deflecton at the trailing edge. I checked out the Robart fowler hinge, it is very similar to the high wing cessna flap hinge. It is a bit large and heavy for this plane, as well as costing as much as the entire kit. I used autocad this time to do all of the drawing for several reasons, one of them was so I could make precision templates to drill the holes for the hinge points. I will have to take some pics of them when I get home, they proved to be very helpful. They set the holes straight in the right place at the right angle. I know that using jigs and drilling guides isn't new, but I havn't really used them before. They are really easy to make and are almost critical to this mecanism's operation. Here are a few more pics of the flap hinged with the linkage installed. It isn't quite at full extension in the pics, there is still a little trimming to be done around the linkage. The servo will just be glued in with D7000 with a hatch for access.

beenie-- Yeah they don't operate quite like Fowlers in the classic sense, there is very little aft movement when they drop, but the technical specs list them as such. It's more of a slotted flap, there is a gap that opens when they deploy. Full scale 0-1's can go 60 degrees. The Vaillancourt plans only give 45 degrees, due to the way his linkage is set up. I plan to modify that to get the full 60, and will make the hinges from aluminum, where the kit has them in thin hobby ply (but scale appearing).

Yours is looking good, nice detail. Keep the thread going, MORE PIX!

With the internal linkage that I have, getting 60* would be difficult. Moving the rod end closer to the LE of the flap would have made it a lot easier, but it would have been dificult to insert the pin through the rod end. I think that 50* will be enough for this plane. A few more pics of the work. The going will be slow for the next week or so, I am in Houston until Thursday and then leave for Albany GA for the weekend. Looks like no progress untill next week. Oh well, gotta go to play with the big planes to pay for the little planes.
Ben

i like your flap setup. looks very clean. nice craftsmanship.

Thanks Tubig
I built the kit 4 or 5 years ago and was rather proud of myself. It looked good but needed a good bit of trim to fly right. There were also a few little problems here and there. Since I built the plane, I have spent 2 years as an aircraft mechanic apprentice. That has given me a new view on precision. I made the clipped wing straight and it only needed one click of trim for straight and level. When I pulled the covering off of the long wing i was a little shocked. The wing that I was once proud of looked pretty rough. It is a little crooked and warped. Many of the parts didn't fit so well so I either scabbed other pieces on or used a lot of glue. It was just ugly!
Ben

Progress has been slow the past week or so. Either out flying or sick in bed. Got a little progress in though. Got both flaps built and hinged. I also modified the linkage to allow for greater deflecton. You can see in the CAD image that I had used a Dubro rod end and had it mounted internally. This meant that to get much deflection I had to cut a large slot in the flap to allow for the pushrod. That was a bad design. Now I have a cut off control horn poking out of the flap LE that a regular quick link hooks up to. This allows the use of a lighter 2-56 pushrod and eliminates having a hatch to access the rod end. So one improvement has 3 benefits. Hopefully Friday I can cover the wing and do the final assembly on all of this flap mess. I plan to cover the bottom of the wing, melt holes for the hinges, install the flaps and hinges, rig the servos, and then finish the covering. Hopefully I'll have some more pics on Friday. The pics don't really do the cool factor justice.
Ben

The going has been slow, but I have had a few good working days on it this week. I have the wing almost fully covered and the flaps are finally installed and rigged. Final deflection is somewhere around 55 degrees. Hopefully there will be a test flight on it on Sunday. I'll update pics with progress.
Ben

I have finally finished and flown the flap wing. It so far has 3 flights on it and I consider it to be sucessful. There is still some minor flight trimming to be done as it drops the same wing every time in a stall and needed a bit of aileron trim to fly straight. But all in all it flies well. The flaps are more effective than I was expecting them to be, takeoffs are now about 5 feet and it just levitates off of the ground. Landings with flaps require a bit of power of else the high rate of descent makes for a nasty touchdown. With flaps down and ailerons up, the descent angle is fairly steep, as opposed to the stock J-3 where floating around on landing was the norm. I have a few more pics of the completed wing included.
Now it is time to strip the fuse and convert it to a -18 fuse.

I have had a good bit of time to work on the fuse the past 2 weeks and it is almost done. I have replaced all of the tail control surfaces, as the stock ones were ok for a j-3 but not even close to a PA-18. I made laminated outlines with 4 layers of 1/16x1/4 balsa over cardboard forms. They will be hinged with Robart hinge points with a scale hinge gap, around 1/16" in 1/6 scale. I was always unhappy with the shape of this cub's tail and now it looks good.

One of the harder parts of this project (at least for me) will be carving a plug for the cowl. The difficulty that I see will be making it look "right". I have seen some other cowls for super cubs that look cartoonish or just wrong. So I have about 30 pics at all different angles to try and make this thing look right. The foam plug will be glassed and the the foam will be dug out. Pretty straightfoward.

There is a cowl hiding somewhere in that white block

It seems that I have been signed in on a friend's name, the past two posts have not been made by bismarck007, they have been made by Beenie.
Ben

Curious how that happens isn't it When are we going to finish the Stinger?

Got some more work on the cowling. The foam plug was frosted in spackle and then sanded smooth. The plan was to cut the nosebowl off of the plug and glass it seperatly. The sides of the cowl would be made from sheets of fiberglass skins, made by me. The nosebowl was glassed seperatly and turned out nicely. I thought that this method would give the best fit to the fuse and also the best look. being the same method used on the full size. Well, the skin deal was way too much trouble, and just wasn't working out. So I fiberglassed the rest of the plug with what I had on hand, one layer of 4 oz, some 1.5 oz and a top layer of .5 oz. I was hoping that the .5 oz top layer would keep some of the pinholes out of the finish. For good measure I coated the cured glass with some epoxy and microballoons. Shows how much I know. One of the pics shows the finish is riddled with pinholes. Some Bondo spot putty and a little primer has taken care of most all of those. I joined the nosebowl back to the rest of the cowling and have filled the seam. I don't have any pics right now, but the cowl is pretty smooth. It doesn't look quite right, but it will do. It looks a little funny on the fuse, as the fuse is not exactly scale when you really look at it. But it will be ok for a sport aircraft.
Ben

Few more pics. Hopefully it will get this thing covered and done next week or so.
The trim scheme is the one that I will try to replicate.

It has been awhile since I have posted here. There has been much progress on the cub, a little regress, and then some more progress. I did finish the cowling and the fuse. The cowling turned out looking a whole lot like the full size and I am happy with it. The color scheme that I liked didn't look so good on the model when I taped it out, so I made my own. With the new, larger tailfeathers, I had to reduce the throw a little, but they work well.
Some pics

The regress that I had posted refers to 2 crashes. I was doing some fairly hard aerobatics with the clipped wing and got it into a really FLAT spin. It was kinda low but it looked really cool so I held it for a little too long. I recovered just in time to hit the ground. Oddly enough, this happened right after I took the pics on the above post. The cowl was torn up a good bit and the right wing inboard half was pretty well destroyed. The fuse was unharmed, just a broken rear wing mounting and one of the hardpoints for the cowl screws was torn out. The pics are of this crash. I fixed the fuse and was flying it a few days later with the long wing when I lost elevator control during an outside snap. I flew upside down for a bit and then it went into the trees. Oddly enough, it went through the canopy of the trees and ended up upside down on the ground, with only a crushed aileron. That long wing is VERY tough, in fact, that whole airplane has been through a lot and is still ok.

The other pic is the one that I was looking for of the first major crash when the wing came off during a roll and the fuse lawn darted into the ground.

All of the damage has been repaired and I have finished the last portion of the project, the floats. You can't have a supercub without floats. They are hollowed out pink foam with wood hardpoints and a hardwood stringer on the top , fiberglassed and painted with automotive rattlecan laquer. They only add 8 ozs to the airplane, the weigh 14.5 ozs but replace 6.5 ozs of legs and wheels. So they add 10% to the weight of the airplane. On the full size plane, Baumann floats, self described as the lightest on the market, add 11%. I am happy about the weight and performance of them. I havn't done a full test flight with them yet, just some runs for the pics and a few quick lift offs. I am waiting for a calm day to flight test them, right now the hurricane is making it a little windy here.