rkcruit

Hey SDP,

I know thisgoes a ways back, but I have a question re: the wingstrut attachment points on your 1/5 scale cub (and maybe your 1/4). I believe that you installed the Robart gear which is more narrow front to back than the kit supplied wire gear from Sig. I know that this requires modification of the hardwood gear mounting blocks. Didn't you add a mounting block about an inch in front of the existing rear block? My real question is what did you do with the wing strut mounting point. Did you attach it further up under the rear Robart gear attachment point? I believe that this would actually be much further foward than the position that is indicated on the plans.

Thanks for your time.

Robert

SunDevilPilot

The strut attachment point did move forwards with the gear. You build the struts on the plane so the change in location is not an issue. Here are a few photos of my 1/5th Cub during the build.

SunDevilPilot

SunDevilPilot

Here is the 1/4 Cub strut attachment. Almost exactly like the 1/5th.

(I have better photos of the 1/4th Cub's struts than the 1/5th)

SunDevilPilot

FlymoreRC

For those who are following this thread...

Here's an update to my cub build. I was using a magnum 91 4-stroke, and am moving to gasoline for all my planes. I replaced the magnum with an RGCF 15cc from Graves RC, using a Jtec compact RCGF 15cc muffler. I cut 10mm from the original 15cc engine standoffs and opened up the firewall hole to accomodate the carb peeking into the firewall.

Flys like a dream. started with a 14x7 triple, but switched to a 14x8 Zoar.

Here's some photos...

rkcruit

SDP,

The pics help a lot. Thanks for posting.

Robert

N1EDM

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I guess I'm resurrecting this old thread for a bit... I'm just collecting parts and info though. I have a Sig Anniversary Cub, 1/5 Scale and see that Robart has a really expensive LG for this plane. I also seem to recall that there were other vendors who supplied some good, scale LG but I cannot remember who they were.

Can anyone help with info or opinions???

Thanks,

Bob

Rv7garage

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All I know is that I have had the Robart gear on my anniversary cub for several seasons, and get nothing but compliments on it. It has been durable, and I do not regret spending the money.

N1EDM

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Thanks RV7.... What did you use for scale tires??? Did you use Robarts or Dubros? What size, if I might ask???

I was also thinking about using a Fiberglass Specialties glass cowl. Any thoughts or comments on that???

Thanks a lot,

Bob

Rv7garage

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I used the DuBro 1/4-scale wheels (I call 'em my tundra tires, haha). They've been durable, and look good. They look much better than the 1/5-scale tires, IMO.

I actually like the Sig 'glass cowl so much that I ordered a second one, just in case

N1EDM

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I think I'll use the Dubro 1/5 Scale tires for the Scale look. I'm getting the Robarts LG. I saw an option listed for the J-3 somewhere for some 'fenders'. Any idea what those are???

In case anyone needs it, someone was rebuilding a J-3 at a local airfield and I had the chance to get some really detailed photos of it, if anyone needs any scale detail.

Bob

jerry rauch

I am in the process of building this plane, I now find that after completing the top of 1 wing panel, I have a warped wing panel. It is warped down at each end from the center by 1/8 in. Can anyone give me some guidance on how to fix this .I guess the pins holding the panel down must have loosened during building. Any suggestions please.

Nauset

Shock absorbing landing gear (formerly made by William Wallace) is now being made by http://www.cublandinggear.com/

Omni Models has the Robart unit for $133.

Rv7garage

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Gratuitous Sig 1/5 Anniversary Cub pics

Nauset

Nice color scheme on your cub Rv7. Is that a smith mini for a stable mate?

Rv7garage

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Thanks! Yes, that is a Smith Miniplane… My other pride and joy

Nauset

I have a Smith Miniplane as well. I need to put in some right thrust as the one and only time I flew it it took a wicked left turn into a tree with only minimal damage to one of the N struts. Did you add right thrust? I've read about 3 degrees is needed.

Rv7garage

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I did indeed, using washers between the motor mount and firewall on the port side, to act as spacers. My Smithy flies great! See my build thread if you're interested; this bird has been flying for 9 years now

Nice color scheme on yours, haha!

http://www.rcuniverse.com/forum/kit-...ane-build.html

Nauset

Thanks I'll check it out. That's the end of me hijacking the cub thread to talk about the smith.

Rv7garage

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No worries. If you have any questions about the Cub, feel free

jstyle13

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I used the Sig cowl as well like RV7 (also ordered a backup as well), as it's pretty nice, although the Fiberglass Spec stuff is really nice. I have several of their pieces for my TF P47 build and I highly recommend them.

I went with the Robart/Dubro gear and tires as you can't beat it for scale looks and functionality. After your build was done, you'd look back and probably regret not spending the $150(or so) to get them and add them to the build. I also highly recommend the Top Notch 1/5 scale dummy engine kit. It's a super nice add-on for the engine and looks SO much better than the plastic engine included with the kit http://www.topnotchkits.com/index_files/TN_Kit11.htm. It can be a challenge to mount and keep engine clearance, but I squeezed mine in there with room to spare for the Saito .72 I have mounted up front. I also used the Mcdaniels remote glow driver for ease of starting and to keep the engine running smoothly at the lower RPM's http://www.sonictronics.com/xcart/pr...cat=310&page=1.

I copied RV's J3 as color inspiration for my build as well as you can see using the Nelson Hobby paint that I brushed on with foam brushes. It turned out very nice, but is somewhat of a pain to use. But this is a cub, and not some high end show plane. It's not supposed to have a super nice finish, but a more robust and used look if that makes sense. It was a really fun build and the quality on the Sig 1/5 Cub kit is excellent!

The plane is easy to fly and looks great low and slow. It doesn't like wind, and I never really fly it much if the winds are above 7-8 mph as it's just to fragile to hold up to rougher landings and higher crosswinds. But all in all it's a wonderful kit and flyer and looks and sounds great putting through the air.

I don't have very many good pics, but here are a few.

-Josh

https://www.youtube.com/watch?v=BOrWfHx2bEU

SunDevilPilot

Of all my planes my Sig 1/5th Cub probably has the most flights on it. Mine has been in continuous service since the maiden in March of 2009. A few minor upgrades along the way, motor, wheels, and gear spring struts.

I do so many touch-n-goes per flight I was rapidly wearing out the wheels. The Dubro inflatable rubber tires seem to last a long time but to solve the issue I made some aluminum wheels with bearings. I also made some spring struts to replace the rubber band / o-ring setup inherent to the Robart gear.

SunDevilPilot

Rv7garage

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SunDevil, I've admired your Cub for years, now. Just excellent attention to detail and scale touches. Some day I want to go back and really detail mine; cockpit, especially. Maybe make the Windows look better, haha

Just for the sake of posting, here are a couple more pics of mine. I'm proud of the engine compartment

John_M_

I made aluminum rims with bearings as well , I added integral drums for working hydraulic drum brakes.

I used 4, 10mm x 5mm miniature ball bearing used in the 1:10 scale car clutch bells, they last a life time as wheel bearings.

John M,

Rv7garage

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That is amazing work, John. Gorgeous. I'd love to see more pics of the mechanics of these; see how the whole system works.

John_M_

I will be posting a thread on the entire refurbish; I turned a 1/4 sig cub near close to 95% scale... I'm waiting for some 3D printed parts in wax to do some lost wax castings to complete the tail wheel and interior parts.

The brakes are expanding thin wall silicone tubes with a thin leather jacket over the tubing for the brake linings... uses a master cylinder made out of 1/4" brass tubing... non expanding Clippard brand clear brake line connects the brake drums to the master cylinder... the system is filled with silicone shock oil, very simple and effective... It will almost hold the aircraft with 3/4 throttle run-ups... you don't need anywhere near that for taxiing, and definitely very little if any on landing or you'll flip it on its nose.


John M,