RE: GP Extra 300S 60 Build
Andrewmc, great choice and yer doing a great job. I built one last year. A few tips. You want this thing light. I got mine down to 7.3 lbs. I'm running a saito 100 (pumped) on 30% heli. The vertical is BANGIN! I went with 5245 mini digital on ailerons and elevators (split) and a 5625 on rudder, pull-pull 2-56 (light...)
I lightened EVERYWHERE. The wing on this thing is built like a tank. You can drop a surprising amount of weight by carefully removing here and there.
The elevator/stab on this plane is very sensitive. In hindsight I would have moved the hinge line forward 1/2" cut 1" from either side of the elevator/stab and added some counter balance. Not a lot of counter balance and in fact hidden like a funtana so it is not overly touchy at high speeds.
Be careful on landing. mine liked to rock a bit. I was all over the ailerons keeping it level on approach, mostly when it got about 5 feet over the runway and down and it gets a bit mushy on approach so keep the power up a bit and don't float it in as it will drop unexpectedly. This plane does the best lomkavecs I have ever seen.
Be sure to beef up the landing gear mounts. I did with mine and it is a good thing as mine survived a drop of 3 feet with only a slightly bend gear. (i.e. don’t slow up too much on landing.)