Haven't we touched on this before? It's a common mistake for a modeller to confuse "frames" and "sections"...or "stations" on a hull drawing. For modelling purposes forget "frames". I doubt many modellers have hull drawings with the frames marked anyway as they are constructional and about 2' apart. However, the stations (a sort of frame drawing) are equally spaced along the vessels length. In the "middle" part of the hull where the lines are reasonably similar the stations can be drawn at full distance apart. Let us assume a ships hull with 20 stations. From station (say) 7 to (say) station 14 they can all be full distance apart and equidistant from each other. At the ends of the hull you will probably see the stations are "halved"....so you get 6.5, 6, 5.5, 5 and so on..and a very fine hull may even go to quarters...but the prime numbers are always equidistant from each other. Hope this helps. BY.