Sig 1/4scale C/W Cub build
 

Hi Guys,
I shoudl have my kit in the next day or two and I am getting ready for the build. I decided to do what I could while waiting for the Kit and started building the dummy engine cylinders. I used the info at Cubmanky's site to build the cylinders http://www.geocities.com/cubmanky/main.html . The build was fairly easy and they turned out nice. I have them primered and they need a final painting in flat black. Here is a pic of the primed cylinders.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

alright! looking forward to this.

RE: Sig 1/4scale C/W Cub build
 

Looking good. I’m looking into having them in a laser cut kit.

RE: Sig 1/4scale C/W Cub build
 

Now you tell me;):D
Anthony
ps. I made all the fins out of styrene I had on hand!!!

RE: Sig 1/4scale C/W Cub build
 

Those are gonna look really good. Of all the Cubs out there, no matter how good the scale, the engine is always the shortcoming when it comes to detail. I built mine (1/5 scale) from scratch, and used pictures I made of a full-size cub engine, took measurements with proportional calipers. It took about a week. I look forward to seeing how yours comes out, I have a BUSA 1/4 scale J-3 to build down the road, and the website you posted looks great, especially if he might have a laser cut kit for the engine soon.

RE: Sig 1/4scale C/W Cub build
 

I am happy with the way they turned out so far, the kit did not show up today so I am going to work on the exhaust and intake pieces for the engine and maybe the sparkplugs. I plan on trying to make a fiberglass crankcase that will fit over my R/C engine to attach the cylinders too, I may have to add a little more to the cylinders to make that work. I will also have to get my R/C engine 1st.
Unfortunately my dimmer/turn signal switch went out on my truck on the way home from work today and I will be spending some $$$$ I wasn't planning on and some time to get it fixed as well[:@] I will have to go in to work late tomorrow because I have no headlights:eek:
I did find a switch at a local auto parts place for $60 that I will pick up on the way to work tomorrow and I will stay after and fix it in a nice warm shop!!
On the build I will be following Cafeenman's tips on building a warren truss structure on the fuse and I will be using Elmers Carpenters glue for the majority of the construction. I will probably use CA for most of the wing construction and epoxy on the high stress area's as required.
I have a goal of having this plane in the air by June 1st, this still should be no problem with all the detail I plan on putting on the cub. I will be covering with Koverall and painting. I will be installing Robart 1/4 scale gear and a full cockpit. I will be trying my hand at rib stitching also. Now all I need id the kit too show up:D
Later!!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

I don't know how well you can see it in the picture, but I made cutouts in the cowl of my 1/5 scale such as the ones that fit around the cylinders on the full size, and then made a plate that fit inside the cowl that I mounted the cylinders to. You have to build up the back a little so the plates are parallel and the cylinders will follow the centerline of the plane. Does that make sense? Mounting them that way allows you to take the dummy engine and the cowl off as a single unit, and there's plenty of room inside the cowl for the engine, even in my smaller plane.

RE: Sig 1/4scale C/W Cub build
 

Yes that makes sense!!!
That is probably what I will wind up doing. I will go the other route on my Zelitz 1/3 when I get to it.
My kit did not show up today[:o] I have been in the basement woking on the exhaust and intake pieces and they are almost finished. I have given them 3 coats of primer sanding between each coat and a coat of polyurethane. That should harden them up and make the final finish easier and smoother. I will post some pics tomorrow after the urethane is dry.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

My kit has arrived:D
I have printed out Cubman's mod for the open door and window and I am getting ready to start building the fuse formers. MAN THIS IS A BUILDERS KIT!!! I framed a Ziroli Stuka in 9 days from scratch and I will be lucky to get that far with this bird in 9 days. You definitly have to think your way through this kit before you go cutting and gluing.
I am going to build the formes then start the fuselage truss sides tonight, with any luck I will have some pics to post tomorrow night.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

Thats why mine still is not finished after 2 years of building! I have built a half a dozen other kits since I started this Cub. I look forward to the day that I finish it though. I will keep my eyes peeled on this post to see how yours comes along! Good Luck and enjoy!

RE: Sig 1/4scale C/W Cub build
 

ckangaroo70,
It looks like you have it right to the finish line, I'd like to see it when it's finished!!

I built one fuse side truss tonight I followed cafeenmans guidline and it turned out very nice, tomorrow night I will build the other half on top of the 1st. I am going to stop at the hobby shop tomorrow and pick up some new stick stock, some of the pieces in the kit are just too bowed to use. I will also need to pick up some wire for the open door mod.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

What is cafeenmans guidline? I have looked at the Balsa USA kit and it’s also a builders kit like the SIG. All I can say is have fun!!!!!!!! I built mine on a 2 foot by 6 foot board on the kitchen table. I had no where else to put it. Now I have a garage/workshop and have started building cubs for people.

RE: Sig 1/4scale C/W Cub build
 

Cub Man,
Look at the top of the kit building forum main page, you will see a thread building a warren truss structure. He has some very good tips for helping with building the fuse.
I have a 3'x8' reinforced building table and a 7'x1.5' sheet of tempered glass on top of that to build on. I lay a piece of foam board down for pinning pieces for glueing when needed. It works out great. I will hopefully post some pics of my progress tonight.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

Well I have the other fuse side framed and I will let it dry overnight before removing from the buildingboard. I have started sanding the pieces for the Stabilizer and I will start construction on that tomorrow and it can be drying while I sand the fuse sides and install the gussets.
I am stuck on what engine to use in this plane, I was going to use the Ryobi 31cc conversion but the engine is too long and will not fit[:o]. I am thinking about a Magnum 91 4-stroke, does anyone have any experience with this engine??? Tower has them for about $180. I really do not want to spend much more than that for an engine.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

Right now Hobby People has the Magnum 91 4 stroke on sale for $149. That is an excellent price. I own both Saitos and Magnums, and the Magnum 4 strokes are a sweet running engine. I actually use Magnums on my Scale Planes cause I think they have a better scale sound, and I use the Saitos on my Aerobatic Planes cause they got that one of a kind Saito Sound, plus a little extra power. The Magnums are an extremely dependable engine, and the break-in process is much shorter than that of a Saito.

I have been leaning more towards usiing the Magnum 120 in my c/w 1/4 scale cub, but the 91 would probally fly it around scale like. With the Plane being a clipped wing, I do want mine to have enough power to do a few basic aerobatics, and this is why I would probally go for the 120.

RE: Sig 1/4scale C/W Cub build
 

I installed a G38 in my Cub. I had to move the firewall back about an inch and half

RE: Sig 1/4scale C/W Cub build
 

I would have had to move the F/W back at least 2 inches and to me that is just too far. I want a nice finished cockpit and that would put the fuel tank pack into the cockpit a good amount.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

Well I am finally getting around to posting some pics,
I have the fuse sides framed,sanded and ply doubler installed, I cut the door opening and reinforced the door and the opening. I also installed 1/64 ply gussets at all the joints on the open framework. I have built the Stabilizer and the elevator and sanded the edges to size, I still need to radius all the edges.
My wife is gone shopping and I gave her a list of stick stock to pick up so I can reinforce the cabin area to account for the open door mod. She just called and they do not have the sizes I need so I told her to get a larger size and I will run it thru my table saw. I will try to complete the cabin area and finish up the fuse and move on to the wings tomorrow.

RE: Sig 1/4scale C/W Cub build
 

Looks like your comming right along. Looking good!

RE: Sig 1/4scale C/W Cub build
 

Thanks!!!
It feels good to be cutting balsa again:D
Anthony

RE: Sig 1/4scale C/W Cub build
 

By the way I almost forgot,
I shortened the door by .200" from the bottom side from what is shown on the plans, with scale hingeing this should allow the door to clear the wing stuts to the full open position. I guess we shall have to wait and see;)
Anthony

RE: Sig 1/4scale C/W Cub build
 

looks good anthony. wow, you can actually get your wife to buy your supplies for you? i'm impressed.

RE: Sig 1/4scale C/W Cub build
 

So am I :D

RE: Sig 1/4scale C/W Cub build
 

If I could figure out how to disguise airplane parts as "equine related artifacts", I could have a hangar the size of the Smithsonian by now[sm=lol.gif]. The Cub is looking good, Anthony, I like the way the structure looks, and I had also thought to gusset the joints with 1/64 ply on both my 1/4 Cub and Birddog (the birddog is former and longerons, but some lightweight bracing won't hurt a thing).I'm thinking that if you cut a small relief in the bottom of the doorsill and lay one arm of the door hinge in it, and pin it, and slot the bottom of the door at a bit of an angle so that the hinge pin is offset to the outside edge, the door will drop down against the outside of the fuse. You can then cover over the exposed hinge end on the doorsill to conceal them. I drew a sketch to illustrate, don't know how well it will show. The way my Sig instructions showed, the bottom of the door binds against the doorsill, and the hinge won't open far enough. This way avoids both. I also include pix of my 1/5 scale to show how unobstrusive the hinges are from outside, and the one showing the door opens demonstrates how far my door opens the way the Sig instructions show to do the hinges. The other thing to look at is a small rotatable bracket on the underside of the right wing that will allow you to hold the window hatch open, as on the full -size. I took a very small piece of aliminum ( about 4 x 8 mm) and bent it, and screwed it into the wing bottom at the spar, after I finished the covering and painted it.

RE: Sig 1/4scale C/W Cub build
 

What I have come up for the door hinge that looks to scale is use two large Robart hinges. I drill the pin out so I can install a small 0-80 screws in them. I made a small jig that would allow me to drill at 45 deg into the door and fuselage. The hinges will need to be trimmed to length. I have yet to come up with a latch that I like for the window

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RE: Sig 1/4scale C/W Cub build
 

Take a look at this pic,
You can see how the full size cub door is hinged, I am going to try and replicate this by using some flat steel stock and make a piece that attaches to the door and a piece that attaches to the frame and get a micro screw and nut to attach them together. I will experiment with making the parts from a hacksaw blade. It should be the right thickness and will be stiff enough to hold up.
I am changeing out the flat balsa instrument panel for a thicker contoured piece of balsa that I will later laminate a .010 thick piece of aluminum to. Where can I get some good looking cub instrument faces?? I will make my own frames and bezes I just need the faces??

RE: Sig 1/4scale C/W Cub build
 

I have been busy today,
Here are a few pics of my progress on the fuse. I bent and installed the reinforcement rods for the cabin top, I will let the fuse dry overnight and finish pulling the aft end together and adding the cross pieces and add the uprights to the cabin area. The open door and window is alot of extra work but I think it will be well worth the effort.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

looks like this kit builds pretty much the same as it's smaller brother (the 1/6 kit). looking good.

RE: Sig 1/4scale C/W Cub build
 

Thanks tubig:D
I couldn't resist buiding another Cub after following your post on the 1/6th. I wasn't planning on building a 1/4 scale but a 1/5. I couldn't pass this one up(still haven't told the wife I need an engine:D) How is your Cub coming??? You should be ready for paint??
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

Thanks tubig:D
I couldn't resist buiding another Cub after following your post on the 1/6th. I wasn't planning on building a 1/4 scale but a 1/5. I couldn't pass this one up(still haven't told the wife I need an engine:D) How is your Cub coming??? You should be ready for paint??
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

yep. almost ready. waiting for some warmer, drier weather in taiwan to finish up with the dope filler coats on the fuse and wing. can't do that stuff indoors........much too smelly. then on with the painting. will start back up on it in a couple of weeks. i'll be watching yours until then.

RE: Sig 1/4scale C/W Cub build
 

Cubman,
I think I have found a solution to the latches on the door and the window. I believe Radioshack sells some very small but strong rare earth magnets. This will be hard to explain but I will try, install 2 magnets in the bottom of the 5/16 balsa in the bottom of the door(they will have to be recessed) then recess 2 magnets in the 5/16 stock in the door opening frame adjacent to where the door magnets would be. You will have to assure that the polarity of the magnets are correct when installing so they will attract each other. You can do the same thing with the window and installl magnets to hold the door and window in the open positions for when you are flying. I will experiment with this and install them in my Cub if it looks like it will work.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

hello guys:D
started back on my full size reduced to a cliped wing sig 1/4 cub. have not worked on it for two years. found this forum today. i had been mulling over a scheme on attaching the aileron servos. looked at a couple models at a hobby shop today. kinda decided on mounting them right on the hatch cover with the servo horn sticking out. it looked simple and clean. any thoughts on this set up. also the owner of the store had a suggestion on using two servos on the elevator. splitting the elevator in half and using one servo for each side. he said if one fails or breaks the other would be enough to land with. again any thoughts? like all your chat so far. you guys have a great deal of experience. i have been building for about ten years, all small stuff. had a idea for the hinges on the cub door. how about using two clevis halves riveted together. one set at each end of the door. it may make it look more scale. don't know if they are big enough or strong enough for the ¼ size door you have.

RE: Sig 1/4scale C/W Cub build
 

Made alot of progress on the fuse tonight,
Installed all the cross members and turtle deck formers and stringers, installed the nose formers and sheeted the nose and installed the cabin floor. I also installed the cabin upright braces. I left the nose bottom sheeting off until I get my engine so I can install the blindnuts for the mount and to setup the fuel tank. I will give the work area a good cleanup before moving on to the Fin and Rudder tommorow night and then on to the wings. If all goes well the plane will be completely framed up by the end of this weekend and I can start on building the cockpit interior. Here are a couple of pics of the fuse as it stands now. By the way I can happily say the fuse came out perfectly straight :D
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

Hello Satdog,
I am going to go with a servo in each wing, I will be using just one on the elevator myself. The idea of using 2 servo's in the tail will work just fine, alot of the large scale aerobatic planes use that setup. I am not sure how I will set my aileron servo's just yet, I should have the wing finished up this weekend and I will post pics of how I decide to set it up.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

i'll post some picks of my setup. my cub will be powered by a surpass 120. i mounted it horizontally. looks cool and saved scaling up the cowl on one side. i'm not after a scale ship.

RE: Sig 1/4scale C/W Cub build
 

The rudder and fin are completed, the right wing panel is framed and the bottom sheeting is installed. I will sheet the top tomorrow and install the leading edge and light ply mounting plates for the struts. There is alot of work in these wing panels. I will post some pics tomorrow.
Later!!
Anthony

RE: Sig 1/4scale C/W Cub build
 

I am working on the left wing panel. The bottom sheeting is installed along with the T/E and aileron sheeting. I will let everything dry until morning and install the wingtip and then construct the center section. I did not take any pics of the right wing during construction but I did take a few of the left. I am off work until Wed. and I hope to have the plane completely framed and sanded before I go back to work. I will post some more pics tomorrow.
Anthony

RE: Sig 1/4scale C/W Cub build
 

Oooohhh I almost forgot, I ordered the Robart gear today and should have them some time next week.

RE: Sig 1/4scale C/W Cub build
 

Here is my SIG CW Cub fashioned after Hazel Sigs full scale. OS 160 twin in the nose. A great flying model. Good luck with yours