Thank you for you reply
Thanks for you reply. In China the most of common foam board's thickness is little more than 5mm. It is easy to find & easy to use. My transmitter can adjust expo and throw limits, but ,because I'm new,I didn't know much about it. So the last test fly I use all 100%. So it make my wing crash all the time : ( luckily it is easy to repair. I will post my test-fly video soon.