Originally Posted by ehirobo
I taped two 430L motor to the bottom of the 400D (weight 119.8g). To my surprise I can hardly feel the weight different. It climb slightly slower and the cyclic input is slower as well. But I still got it up to around 8-10M high and it would climb higher if I wants to. I am really suprise for the small effect of additional 120g to a 640g helicopter.
I do believe you just made a sale. Thanks for the info.