Originally Posted by Tom Nied

I'm not sure what series Guillows you are looking at, so be careful how you scale it up. There's a 400 (24 3/8") and 500 (16 1/2") series BF-109. Suggest buy the larger one. Also, do more research, don't just take my ideas as gospel. I'm guessing from 50 years of experience. So you might want to find and contact a free flight group that could give you even more info as far as scaling up and what you need to do to scale up a Guillows model.