Just info on batteries. I have dual batteries in my Herk. Yesterday I was flying my Extra 300 and it went straight as an arrow into the ground. Postmortom found the battery buss strap welds were not full penetrating welds. The welds broke and the battery went to zero output. All flight controls of course remained in the last position of a cuban 8. Pic attached tells the results.

You might want to consider dual batteries. Also for those who might ask.. my Extra battery was very well foam insulated from vibration and the engine was on a Dubro Iso mount. Jim