Hi Jake!

Congrats on finishingthe Dora; I'm looking forward to seeing her fly.

I'm hearing some reports in the forum threads that the YS 115 vibrates the airframe heavily. I think you'll needadditional reinforcement. Beings you are already planning on putting thinned epoxy inside anyway, why not put some 3.5 - 4 oz. fiberglass cloth in that area while you're at it? The addition of cloth will add significant strength, but next to nothing as far asany additional weight.

For Silver, some will tell you thatyou could probably get away without fiberglassing the center section of the wing. But personally, I wouldn't risk it. I recommend fiberglassing the centersection anyway, and never having to worry about<u>IF</u> it will hold. It is cheap insurance and makes for one less thing going through your mind come race day. Furthermore, you not only have to worry about whether it will hold in the near future, but more importantly . . . will it hold without the reinforcement after those less than perfect landings, season after season?

(I just got done fixing the wing on the purple and yellow Mustang before the last race,because I had noticed the wing was flexing more than it used to. I found thatseveral ofthe glue bonds between the sheeting and ribs had weakened and were beginning to fail from all the repeated stresses of multiple hard landings, flip-overs at the end of the runway, vibration, etc., over the last 4 years and 2 fuses it was attached to. Many racers don't reinforce, and then don't notice the minor fractures that weaken the joint until it's too late as they're going through the remnants in their crash buckets. I say, FGthe center once and be done with it.)