It needs to be going vertical on that shear webing....Ask Jarvis Johnson. I was helping him trim his model at the Yuma Contest. He had about 15-20 flights on the model. The right wing departed the model in a 4pt roll.

The purpose of the shear web is to keep the spars from moving toward each other. If the grain is not vertical the balsa will split and the spars will come together. When this happens there is nothing to give strength out past the tube location and the tube will pull right through the sheeting. I don't feel its a rib issue its just a shear webbing issue.

Solution is to on the back side of the wing spars, easily accessed when covering is removed form the bottom of the wing. Add shear webs with the grain going the correct vertical direction to each bay. On the inboard bays you will have to slice the sheeting to allow for this web to be installed. It needs to be in each bay all the way out...My opinion is all the way to the tip. Thick CA would be fine for attaching the web.

As for opening the sheeting...you don't need a big hole just a little clean slot that you can slide the web down into the bay and attach it to the 2 spars.

This model flies really well. I'm surprised as its all open bay structures...but it flies awesome. I flew Bryan Kennedy's back in October and Jarvis's model a couple weeks ago and its a good plane.

Both models failed the same way. I was lucky and not the one flying Bryan's when it failed. Unfortunately Jarvis didn't have much rudder travel on his and it just would not hold knife edge at full stick.

I would recommend this plane as it flies really well. For starting out, I think this plane and the Focus are at the top of the list for less expensive models that fly well and can do the job.


Troy