Is this vec file any good

I'm trying to build a UAV classifier, but having little success. I know I need more sample but am I on the right track? [My Vec File](https://www.dropbox.com/s/cjq7ch501h0sazz/uav.vec?dl=0) has 300 images all scales to 50 X 30 I'm using 1200 negative images. Is it just a need for more sample or is there a fundamental error in the type of samples I'm collecting Any pointers from some more experienced users would be appreicated. I just don't want to carry on what I'm doing for another 700 or so images if my approach itself is flawed regards Jon