70cc twin V2
What is happening is when you are doing violent snaps at very high speeds the following happens the wing is extremely strong and stiff and also the fuselage with both having carbon tubes. But unfortunately all of these forces are focused into one location and that is were the wing tube and the fuselage intersect and it is only 5/8 wide. So what happens is that the hole in the fuselage gets enlarged quite quickly, and the balsa around the wing gets compressed . Next thing you know is that the wing is loose.
Still working on the changes depending what happens on the next few flights will decide to leave the changes made or put it away and take a long look at it over the coming winter. The changes I have made are not proven yet.
Ok have about 25 additional flights on the plane after the first repair and after 5 flights the wing was starting to loosen up again. So the last fix it is 20 flights old and still as solid as when started off. No guarantees that it is a total fix but looks promising. Ok.
Drilled out the hole in the fuselage and installed a maple hardwood donut. Then fixed all the depressions on the fuselage, after that thinned some epoxy down 50% and painted the fuselage around the wing to harden everything up. Then fitted the carbon tube to the donut and glued it in. After I did that no more problems. The first time I did not glue the carbon tube in and started to loosen up again. Hope this helps.
The changes have worked out well. After the changes I flew the plane for rest of the summer hard and I mean hard and it is still in good shape. Cleaned it up for the winter and will be ready next year for another season of abuse.
Hi Nick, ok cannot take a picture because all you will see is the covering. I do know if I built another one what I would do. I can give you a description if you like let me know.Would you be so kind as to snap a photo of your fuselage reinforcements/Wing Tube support structure? Thanks!
It's great! I would also like to build one, where can I get the plans?
You guys stay tuned. This plane along with a couple of my other designs may actually be getting kitted. I will keep you all informed if and when it happens.