Cub Flyer Fresno

Well, I'm starting feel better now, still tired however... very tired! I went home early from work on Friday at 11:00 AM, which would be our normal quitting time, only because I couldn't keep going. I went back to work Saturday, one hour late (7:00AM) and worked till everyone else called it quits at 3:30 PM. Then I went home and did my yard work, what I could anyway, took a shower and collapsed for the rest of the evening. Now it's Sunday, I woke up at 8:00 AM, stayed home from church and vegetated on the sofa until 1:30 PM at which point I walk over to my daughters in-law's house to visit. Now to make a long story short (TO LATE!) after a short visit I finally came home and did what y'all can't live without: I took some progress photos!

So, without further adieu, here ya go! Still too tired to do anything else darn it!

stevegauth30

Get yourself better first. The cub will still be in the same state when you get back to it, and we ain't going anywhere either. Glad to hear your feeling a bit better anyway.

Melchizedek

Ditto,

Rest up David. If sick, stay home and get better.

Kevin

flyingagin

Leave it be till you feel on game. Cause if you aint on game, it won't be to your standards.

Ken

Cub Flyer Fresno

That's a good thought there Ken. I'll do that.

Now, Kevin: If sick... gotta keep pushing through it as best I can. There is a lot of work to be done and it needs to get done right! If it doesn't get done right, it's going to be a lot worse later! But there is only (only, yeah right!) one month of this to go. Just have to get through that month, then I will hopefully be able to take a 2-1/2 week vacation, time that I couldn't take last year because there was too much work. At least the company let us carry it over. All three of my repairs may have to wait until then.

VincentJ

Good advice...get better first, your health is more important!

Cub Flyer Fresno

Well, now that spring is here and I got my car fixed (finally!) maybe I'll feel more like getting out and finishing this thread up. I am going to have to make a run to HD and pick up some more paint. It'll only take a small amount so I should have a bunch left over. Since work is still going fast and furious though, this is still going to be slow. I think I'm going to concentrate on the struts next, they shouldn't be that difficult.

That's it for now!

Leroy Gardner

I found ya, at first I thought you ran down a watermelon, then found out it was a guy, at any rate the plane took a beating and is looking pretty good at this point. Get yourself in shape and then the plane, it's got to be a bummer to bang it up right off, the next go round has to be better. Think I'll stick around and see you finish it.

Leroy

Sorry I posted on the wrong thread, oh well ?

Cub Flyer Fresno

Guess what I'm doing! If you said resting after a long day at work, you'd be... WRONG! I got started working on the wing at long last!

So, I opened the top up and took my first look. It really doesn't look that bad. The ply dihedral brace appears to be broken right at the first ply rib. Now the question for all of you; how should I proceed to fix this?

flyingagin

Slot out the rib and add a repair doubler of maybe 3 " to the exist one matching ply type and thickness and width. It will just slip right in with no fuss. Use epoxy.

Really surprised that the center section is not glassed.

Ken

Hey building is relaxing not work

John_M_

That's a tough one CFF... like I did, you probably glued the brace into the slot / box in the left wing panel... the dihedral brace is a structural part, and the wing struts take a lot of the loads, but you can't leave it cracked... you can't put a doubler on the face side, because it will set the wing back the thickness of the doubler... you could put the doubler on the inside, which wouldn't be too noticeable... you can also try soaking the break in thin CA and hope its gets in there... then you can try pinning the break with some 1/16" music wire at an angle through the break, starting from the bottom upwards through the break; it could be made strong enough if you have a drill bit long enough to get in there.

I personally would take the long way and replace that dihedral brace... I'd take a sharp chisel and remove the ply face on the slot / box and just start chiseling out the dihedral brace, small pieces at a time... you could make a new brace from ply or laminate one from carbon fiber cloth.


Its a bad place for a break to occur, that's for sure.

***EDIT***

Pin it



John M,

VincentJ

Yup needs to be replaced, and it is in a bad spot. No easy way to fix that, I think I would add a new one on the back side after you open up the wing rather than destroying the leading edge of the wing...

Cub Flyer Fresno

That's what I am doing now, I started opening it up last night. I chatted with Robert a bit last night and the light finally came on, it's a little slow sometimes. I can basically put a doubler behind it or I may glass it or both. I'm thinking I should also "pin" it with 1/8" dowels as well.

WacoNut

Aren't you supposed to be working?

While you are in there I would add the doubler and pin it. A little bit of overkill is always good in these situations.
Later!!
Anthony

spaceworm

My Sig 1/4 Cub has failed in that same spot. Due to swerve to left on TO and me not quick enough to apply right rudder in time. Mind that it is a weak point, BUT that it fails before anything more important fails. SO, maybe NOT strengthen it more than it was designed for. Let it be the failure point. If possible, make it easily replaceable, like with bolts or screws. I epoxied my replacement dihedral brace back in, but if it happens again, I am going to re-engineer it to be easily replaceable. I like my 100 inch H9 Cub that has flat aluminum bars bolted to fore and aft cabin bulkheads to locate and strengthen the wing to fuse joint. My next Cub will use that approach.

Sincerely, Richard
Cub Brotherhood #187; Sig 1/4 (Koverall/dope), H9 100 inch (Gen 1) (Solartex/?), GB Anniv Cub (NIB)
Club Saito #635; Saito 56, 100, 120abc, 130T, 180

flyingagin

Yeah I thought you were supposed to be working 30 hour days, 8 day weeks.
Now get back to work you shirker.

Ken

Cub Flyer Fresno

Back to work???!!! Oh, I'm back to work again, and how! I'm tired of it and I want to to stop... the OT that is, still need the job.

Yep, looking at it some more, I'm going to have to go get some A/C plywood and double it in back as well as pin it. I'm not sure about allowing it to be the weakest point and making it easily replaceable though. I'll have to give that some thought. This design relies heavily on the struts. And speaking of struts, I am very pleased with how well they held up! They bent but not broken, so I guess my design worked. I should say I do owe some thanks to Anthony and Robert for ideas on that.

So, back to the "work" thing; it's time to rest.

flyingagin

No rest for the wicked

Ken

Cub Flyer Fresno

Guess I must not be too wicked, I got some good sleep last night. Felt refreshed this morning. Took it slow and easy, had a good breakfast, watched a little boob tube, took a shower and shaved... feeling good! So since it's raining today... OH YEAH! IT'S RAINING HERE!!! WOO HOO!!!... I decided to get out in the garage... er, uh... hanger and do a little work on the Cub.

So while I was starting to get to work my eye got a glimpse of a piece of 1/8" ply that happened to be the exact, and I mean exact length I needed to fix this wing. Then with a little cutting and digging and more cutting and digging and etc.'ing, I was able to create a pocket for the ply. Before I glue it in I wanted to try to get some opinions: Am I doing this right? It's a nice tight fit, in fact when I did the initial fit I didn't think I was going to get the doubler back out again! So what do y'all think?

acerc

I think that will work just fine. Just epoxy it well with the dowel in place.

Cub Flyer Fresno

By "dowel" I assume you are referring to "pinning" with 1/8" dowels? I plan on putting four 1/8" dowels, two on one side of the root rib and two on the other. What thinkest thou?

By the way, rain's coming down heavy now! I don't care if I don't get to fly at all this spring as long as it keeps raining!

acerc

I was speaking of the one that sticks out the front and goes into the fuse when assembling. At least that is what I assume those little round holes are for.

Cub Flyer Fresno

Ah, yes... uh... yeah, I don't know if I want to put the wing on when I epoxy it, I'll never get the wing back off again. I follow you though. Thanks for the advice Ace! At least this portion of the repair should be done today.

And it's still raining!
https://www.youtube.com/watch?v=-JEx_-IY-NE&feature=youtu.be

acerc

Ah, I see, your dowels are on the fuse not the wing.

flyingagin

What you are doing looks good to me. The vid is private.
When epoxying and I have places I don't want to get stuck I use wax paper. Some times with extra help of a real light cooking oil wipe. I have use candle wax in fittings when I had to bolt a part in for accurate alignment while the epoxy set. There are a ton of ways. Whatever works and dose not cause problems later is the correct way.

Hey you going to be ready to fly together in a double of weeks or so? Now which stick on the tx does what again?

Ken