well if you read it correctly or maybe I typed in incorrectly, i'm comparing the strength to hold up. at the power level I'm hoping to achieve you just don't see any one using a 400, they use a glide, come to think about no one uses a 727 either. I think there is a company out of Canada that makes a 400 for this power level but I don't recall the price of them. if you know please post a link so I can see the cost to convert compared to the glide and 727.