nitromodels has some .25 size arfs. i have never bought one so i do not know about the quality. i just put a maiden flight on a sonic low wing with a magnum .28 2 stroke. hobby people use to carry some .25 arfs but i do not think they have them anymore. sadly over the years 25 size arfs have lost their popularity. world models has .30 size pattern plane. i think its called a zen 30