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Thread: Rebuilding a 1956 Certified Cub

  1. #41

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    Dec 2020
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    Well it's back to Fairbanks for me. We ended up getting both wings painted so that means way less painting next summer! They ended up looking really good and makes it look like it might actually fly one of these days. Huge thanks to Dad for doing the last few coats of paint after I left so we didn't leave it unfinished.

    Next up is taking apart the engine over Thanksgiving. Fingers crossed...

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  2. #42

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    After a very long semester I'm back to working on the cub. Over thanksgiving we tore down the engine and shipped all the parts to Aircraft Specialties and the case to Divco. Dad and I were both pleasantly surprised by the way the engine looked on the inside, since it had been sitting since 1993 (!) at least. The crank passed initial inspections but the interior failed for 160hp, bummer. The last thing we have heard is that they are working on grinding it to see if it will make a 150hp and looking around for a 160hp crank, fingers crossed.

    I would say out of all the things we've done so far I have learned the most from the engine work, I helped my dad put new cylinders on his cub a couple of years ago and he helped my do the head gaskets on my car but I had never actually seen the inside of the case with the cam and crank etc. Very cool! Even though I knew how it worked it helped a lot to see it all up close.

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    After Thanksgiving I went back to Fairbanks for 2 of the busiest weeks I have ever had between finals, projects, activities and all of the other miscellaneous obligations that seem like no big deal until they're all at the same time. When it was finally all over I drove back to Anchorage ready for some rest and to start getting some stuff done.

    In the past week we have been working on the interior panels. Over the summer I made a bunch of paper patterns for them so we double checked those and cut them out of .020 2024.

    To stiffen them up we borrowed a friend's bead roller. Lots of deliberation went into how to make the best looking beads, but luckily before we started going to town on them we started doing some research. We didn't know, but you need to pre-stretch the area that you are going to bead. Otherwise the piece will turn into a warped oil can that won't sit flat. Real professionals that have all of the tools use an english wheel to do their pre-stretch, but since we didn't have one of those we found some mismatching dies for the bead roller: one rounded, and instead of a female die, just a flat surface for the bottom. I tested it and it worked great! If I stretched on the opposite side of where I wanted the bead then did the real bead after on the correct side, the product was flat and much stiffer than it was before I started, success! Testing proved that you can bead deeper than your pre-stretch allows for though.

    I started beading the actual panels a couple of days ago, I'm using a die that gives a step down on one side and I'm really happy with how they look so far! The narrower panels are easier because you don't have to contend with the throat depth of the roller, but if you're clever and try a dry run without clamping down the roller on the line you can make it work on the bigger panels. The pictures show the panels that are on the sides of the extended baggage, I have a few more done now, but it's a work in progress.

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  3. #43

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    Dec 2020
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    We're getting geared up for the engine assembly and we can't find the sealant you're supposed to use on the case with the silk thread. There's a lycoming service instruction that calls out POB no. 4 but the company they list as the manufacturer is out of business.

    Has anybody used something else with the thread? Or do you have any opinions about the loctite only method that is in the service instruction as well?
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  4. #44
    Steve Pierce's Avatar
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    Mar 2002
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    Aviation Permatex with silk thread or the Locktite product. Have used both and they work well. Aircraft Spruce and O'Reilly's Auto Parts both have the Permatex
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
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  5. #45
    Gordon Misch's Avatar
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    Dec 2003
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    I've used Hylomar aerograde PL32 together with the thread at the suggestion of my supervising IA. Also used it without thread for sump and accessory case. Perfect result.
    Gordon

    N4328M KTDO
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  6. #46

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    I've been too busy enjoying summer to post any updates, but my project has been coming along nicely. In March we assembled the engine as planned, but the cylinders did not show up with the rest of the parts so I left for Fairbanks with only the lower end completed.

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    The end of the semester was hectic and in the middle of it all I found out that my Dad was going to need a coronary bypass. He was able to schedule it for mid May and that gave us the same two weeks before I started work for the summer and he had surgery. In that time we were able to do quite a bit of work to my project. By the time I was home in Anchorage my cylinders had shown up so we installed them. I helped Dad put new cylinders on his cub several years ago so I enjoyed seeing what I remembered and being able to do lots more on my own this time around.

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    Once we got to the end of my engine parts again we moved to the fuselage with the goal of putting getting it as close to ready for fabric as we could. That included installing the baggage floorboards, seat base, flap handle, control cables, and a bunch of other stuff. We were able to put the time to good use and made significant progress towards that goal. The picture below shows the interior panels that I had powdercoated. I'm really proud of the way that they turned out and I think they will continue to look good for years.

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    Surgery came and went and the doctors are all very impressed by his progress, it seems like his pain is getting better all the time. My job for the summer is an internship funded by the Alaska Space Grant working at Helio Alaska. I have been learning lots of cool engineering stuff and getting to see the Helio along the way. I found a place where the flap cable rubbed against the sidewall and so I designed a little guide and one of the Helio guys helped me 3d print it.

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    After a few weeks of recovery and chipping away after work we just started putting the belly fabric on, it's almost looking like an airplane!

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    Last of all, Happy Fathers day to all of the dads here. The bypass gave me some perspective and I am more thankful than ever to have a Dad here who can teach me to be a man and to build an airplane along the way. My sister took this picture of us staring at some plane flying over while she waited for us, its a favorite of mine.

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