Critique Tried Panning for the first time-Drift cars

[jpgreenwood]

I visited Teesside Autodrome yesterday for the Drift Practices. This is a free event for spectators so thought it would get me some good lens time with my new 15-600mm Sigma. I've never tried panning before so after watching a few YouTube videos, I forgot everything I learnt and just went for it. Most shots taken at about 300-400mm and 1/50 second. Its not pro gear. Nikon D7200 and contemporary lens.
I know they are not as sharp as I would have liked, and out of about 300 shots taken on continuous mode, I got about 10% keep rate. Feel free to critique.
DSC_2300 by jason greenwood, on Flickr
DSC_2223 by jason greenwood, on Flickr
DSC_2195 by jason greenwood, on Flickr
DSC_2182 by jason greenwood, on Flickr
DSC_2048 by jason greenwood, on Flickr
DSC_1930 by jason greenwood, on Flickr
DSC_1909 by jason greenwood, on Flickr

 

[Dangermouse]

And you did very well, like those a lot, sharp where they should be and blurred where they should be blurred...........well done

 

[jpgreenwood]

Cheers bud. I'm practicing for the Mach Loop.

 

[TMT]

Some cracking pans. I really like #2 in particular - clean, sharp and lots of blur. I love the stationary/locked rear wheel too!