There are actually three different Alpha's featured on the video.
The shots that I think you are referring to are with two Alpha's in the one race, both with green spinnakers.
The first 1/2 to 2/3s of the video is of the Alpha's before we had fitted T foils and the last section has them both with T foils. The race with the two Alpha's was shot at a club heat at Adelaide sailing club where they race in "Division one" against all the NACRA 5.8's, A class, F16's, F18's, etc, on yardstick (in which race the first cat on yardstick was one of the Alpha's, and the other came third) Over the line they were second and fourth respectively. The two sailers on those two Alpha’s weigh 85kgs and 95kgs respectively – so no great “lightweights” – it just goes to demonstrate the versatility of the Alpha when it comes to weight carrying and to still able to be competitive.