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Old Sep 08, 2014, 05:57 PM
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I'm wondering if that is a design flaw or just not enough glue. Since I read of your plane's demise I've peered down my wings several times with a strong light. I'm wondering what type of adhesive was used. It wasn't over used that's for sure. I may make up a long brush and put some epoxy along the ribs to the end of the wing tube. That's about the fourth thing I've decided needed fixing since your crash. A friend who has experience with this plane says to just go fly it. They had no wing problems of any kind using an OS 160 in theirs. One way or another it is getting flown this weekend.

Rick H.
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Old Sep 08, 2014, 08:11 PM
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I'd use thin CA. It penetrates better than epoxy and I've used it to strengthen many a questionably glued plane.
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Old Sep 08, 2014, 10:33 PM
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I think it's an engineering problem. Here are some shots of mine with some of the sheeting removed from the bottom. You can see that the tie-in from the wing tube to the wing structure is simply a piece of 3/32" soft balsa that is split lengthwise into two pieces. The wing sheeting glues to these two pieces. The tube is secured through the ribs as well, but they're really fragile in this area due to their large lightening cutouts.
When the wing flexes upwards under load, the wing tube essentially stays in place (since it's secured through the fuselage) and the wing structure simply pulls away from it.

My initial plan, subject to change , is to build a box structure using 1/8" sheeting and 1/4" stock around the tube and carry it all the way out to where it intersects with the spar. I'll tie it in really well at that point. I'm also going to extend the lower wing sheeting out to the servo mounting box structure, and reinforce the ribs that the tube goes through. I think I'll also add some fiberglass cloth and epoxy where warranted to strengthen it further. All of this while trying to add only about 2 ozs lol.

And of course I'll finish the shear webs on this wing panel, the other panel is done.
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Old Sep 09, 2014, 02:27 AM
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That 3rd photo is frightening!
2oz per panel is going to be a challenge.

Given the amount of work required and the other questions regarding the design/construction of the rest of the airframe, perhaps it would be easier to just get a 2m Monolog 140 or EF Vanquish?
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Old Sep 09, 2014, 08:24 PM
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Quote:
Originally Posted by ltc View Post
That 3rd photo is frightening!
2oz per panel is going to be a challenge.

Given the amount of work required and the other questions regarding the design/construction of the rest of the airframe, perhaps it would be easier to just get a 2m Monolog 140 or EF Vanquish?
2 ozs was tongue in cheek, I'm sure that won't happen Would be nice, though!

Yep, definitely would be easier. I would recommend a Monolog or Vanquish over the Evolution if one doesn't have much building experience. The desire to dig in and make the required fixes to the Evolution would also need to be there. I knew about the problems with the Evolution before I ordered it, and was ready to deal with them. Plus I thought it would be a fun project, I miss building. Saving $500 over the cost of a Vanquish was nice too

The Evolution (from what some very experienced pilots have said) is a really nice flying pattern plane. Hopefully all the extra work will be worth it!
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Old Sep 14, 2014, 09:51 PM
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At a friends suggestion I stripped the covering from the root to about an inch inside the rib bays top and bottom and glassed them with 2 oz. cloth. This will bind together the entire wing tube assembly and should hold it all together unless things get totally out of hand. Now if I could just get the damn YS to start....

Rick H.
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Old Apr 02, 2015, 01:20 AM
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308, did you ever get your Evolution flying? I finished the wing mods on mine, but haven't done any other work on it recently. I have a couple of other projects going, but am getting the itch to start working on the Evo again.
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Old Apr 03, 2015, 12:15 PM
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Yeah it's been flown a little. Unfortunately I put a YS 140 on it which is plenty of power when it runs properly but it's been a bit difficult to deal with. I like the way the plane flies and so far my glass solution has held up. The landing gear gave up on the second landing in rough but that was my fault. I've used some brass rod inside the cf tubes to rebuild and think that will hold. If I built another one I'd make all these changes from the start. Anyway if I can get the engine sorted out this will be a nice flying airplane. I hope to hit a few contests with it this season.

Rick H.
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Old Apr 06, 2015, 06:39 PM
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Sorry to hear about the cranky engine. I almost went with the stock gear setup and was going to insert CF rod into each strut. I ended up buying a set of CF gear from an Integral. If you need it, I can send you the stock gear... just let me know. Glad to hear your wing is holding up, and that you like the way it flies.
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