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Old Jul 24, 2012, 12:29 PM
Aurora Builder
United States, MD, Lusby
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I use 4.1oz uni in my wings as spars and tip doublers. It does aide in increasing tip strength but I still find a patch necessary for good long term strength. I'm flying a wing with a glass tip patch and uni dart and I had a failure due to poor launching. Easy fix with a carbon patch on top and bottom, but the point is including a carbon patch on such thin wings is a good idea. 1K carbon works great, probably better than 3K as the weave is tighter.
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Old Jul 24, 2012, 01:21 PM
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United States, SC, Mt Pleasant
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Thomas,

I still believe the primary problem is the carbon rods not going to the tip. I'd suggest finding a way to extend at least the top rod to the tip if not both. Adding another rod at the root will not fix this problem. To me it was the mid wing on out to the tip that could use the extra stiffness not the root. If adding the 3k fabric solves the problem with only a couple of grams is probably worth it on a pure cost to time ratio but for me just adding two strips of carbon tow about 4 inches long connecting the peg to the spar was all it took to feel stiff. We will see how it holds up however!

James
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Old Jul 24, 2012, 01:24 PM
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Forgot to mention,

After the repair I switched the Neos to a 1S 500 mah lipo for experimenting. We will see how it works but was pleased with the performance on the bench! Going to to fly it soon and hopefully get some launch numbers.

James
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Old Jul 24, 2012, 05:25 PM
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Quote:
Originally Posted by hohensej View Post
Forgot to mention,

After the repair I switched the Neos to a 1S 500 mah lipo for experimenting. We will see how it works but was pleased with the performance on the bench! Going to to fly it soon and hopefully get some launch numbers.

James
What brand RX and servos are you using in your setup?
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Old Jul 24, 2012, 06:26 PM
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Thanks Gerald and Sam, we will try those cloth next time and see the results. If that means a little less weight and a little thinner layup and still works, then that's great!
James, the rods at the tip cannot go any further because of how thin it is, the 2 rods are virtually touching each other as it is. We haven't tried to only extend 1 rod, but I am worried it will load the stress on the other side unevenly. Thanks for the info on the tow, keep us updated on how it works! The 2nd spar (in front) is to handle overall wing stiffness, especially at the roots, similar to the kevlar wings. You will love 1s! I love it love it love it love it
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Old Jul 24, 2012, 06:37 PM
G_T
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On all the planes Phil and I made using Zone and Edge foils, including wings that should be thinner than yours at the tip, we carried both rods as far as we could. I've looked at your wing picture and I'm thinking your rods can extend to within a cm of the tip. I do not know how far they are from the tip - it is probably in a post but I don't have time to read for it right now - my bad!

There are two techniques you can use. Sand a contour onto the outside surface of the rod to match the wing shape.

Offset the two spars so they are not exactly on top of each other at the tips.

I think you want both spars to continue out towards the tips to get fairly close. Extending only one strikes me as a way to prevent breaking a tip off but it would not provide stiffness to prevent the inital crease from occurring.

All of this is alleviated to a fair degree if one uses unicarbon parallel to the spar. The bias Kevlar or carbon skin fabric transfers the loads to the spar, and keeps the unicarbon from splitting. The unicarbon itself spreads out the load transfer to the spar so it occurs progressively.

Gerald
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Old Jul 24, 2012, 07:04 PM
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Thanks for the tips ( ), I have not thought about offsetting the 2, perhaps the bottom one can be moved forwards by 2 mm and it should bypass each other by the tips and extend further outwards. There are only a couple planes left before our pause, so these planes will continue to be built with the 3K. We will experiment with the offset rods and uni next month, and will have them implemented when production starts again.

Thomas
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Old Jul 24, 2012, 09:18 PM
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Probably you only need to offset on of the rods,enough so that at the last 5-6" they are offset. On mine they end up about 1/4" apart, but who knows if there is some better offset.

Good luck,

Gary
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Old Jul 25, 2012, 12:34 AM
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Hi Thomas. NEOS arrived safe n sound !!!!! hooray
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Old Jul 25, 2012, 01:39 AM
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NICE! Another 2 to hit Australia
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Old Jul 25, 2012, 07:09 AM
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Whooooooaaaa - Thomas - Nice tails on Facebook!!!!!!!!!
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Old Jul 25, 2012, 07:44 AM
Aurora Builder
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Are those plan tails or other tails? Guess I have to check facebook now (ugh)...
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Old Jul 25, 2012, 09:19 AM
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:-D Plane tails ;-)

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Old Jul 25, 2012, 10:17 AM
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So flew Neos yesterday. Launches are just a bit lower then my Stobel which is probably due to wingarea. Its not much and not noticeable from the ground but definately a lower average when using my altimeter. My repair seems to be holding nicely and so far I am happy with 1S operation. The lower voltage was not noticed at all in flight. I only flew for about about an hour and when I got home was reading 3.9 to 4 volts under load (digitals make the voltage move around a bit) and put 100 mah back into the pack. I'll have to fly longer and see how long I can push it. It would be nice to get a solid 1.5 to 2 hours and not worry about battery. That way i dont have to switch planes or batteries in the middle of a fly off.

BTW, I am using spektrum Rx with two JR285s and two Hyperions.

Now I just need a set of new tails to get the weight out of the nose!
James
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Old Jul 25, 2012, 10:26 AM
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And yes, only adding material to the top of the wing, as that is were the failures are occuring, would make the wing stiffer IN THAT DIRECTION. Whether its done by adding a nother layer of fabric, carbon tow or extending a single bit of spar, it does not matter. Adding material to the bottom in this case would be adding very little to solving this failure. Or at least so says my statics book.

James
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