well I took the wing off the plane and grabbed it by each end then gave it a twist both ways and it has zero flex. I mean it is stiff...so I think it will be ok also...the arrows are there because this wing is made in 2 halves and joined together with a 8" long piece of 1/4" steel rod in the center. it doesn't have a 1 piece spar from wingtip to wingtip like most planes (and also the first plane I made that used this wing folded about 140 ft up on me) so the arrows are there to prevent that. I have the same exact wing ( no ailerons) on my high wing trainer and I TRIED to fold it many times and no luck. they make a big difference and are extremely light. here is a pic of my trainer plane also .25 powered