We have had both a 240 on our R-25 Classic and now a 270 on our C-28.
The 270 definitely sticks out from both sides of the swim step and gets a lot of wake splash on the port side. We strap the dinghy as high as it will go on the 4” up by 4” out davits to minimize this but it’s still an issue.
The 270 is also shifted to the starboard side rather than centered. Because of the sloping up nose tubes this doesn’t cause any real problems with the dinghy bow rubbing on the dock. You want to measure to get the right amount of starboard shift though. We measured with the boat at a high dock and our normal fenders in position before mounting the davits to be sure we had a few inches of clearance.
The old 240 we had was a fiberglass RIB hull and actually 15 pounds heavier than our present 270 Zodiac aluminum RIB. As such the 270 is much easier to get vertical on the davits than the old 240. Would still do the 270 again if I had to choose.
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