I was concerned because the larger the diameter the stronger it is. 1/4 in is fine. I have used 1/4 in carbon fibre too, which is much stiffer yet but is harder to come by. Better to use two layers of glass on one that size. Went to the BTE website to check it out. Nice. A lot of elevator area. Needs to be built as light as possible even if you have to replace heavy kit balsa for lighter wood. Built up structure would be even better but more work for lighter weight.