I have experience changing the old C&C aluminum frames on an earlier 34 (1978) – the same frames that were used on the mid-70s C&C 33 – with Lewmar opening ports. As you indicated, non-opening ports can be used on a slightly curved surface without issue, which is how the windows on the 34 were originally installed. However, the Lewmar installation instructions were quite clear that opening ports must be mounted on a flat surface. To address this, I had my opening ports professionally installed. With the old windows removed, the interior liner was epoxied (West System) to the interior wall, thereby increasing the total wall thickness (and eliminating a gap for water to seep into unnoticed). After the cut-out was opened slightly for the Lewmar frame, the installer “flattened” the mounting surface by routing (very slightly) into the outside cabin wall at certain locations where the frame attached. When he was finished, you would have to look really closely to see that the frame was slightly embedded into the gel coat in these locations. The windows looked and worked great, and the opening ports made a huge difference down below on hot days.
It was an expensive and time-consuming installation, but I was very happy with the end result. I don’t know if the windows would have worked properly or leaked had they just been attached to the curved surface. From: Pierre Tremblay via CnC-List Sent: Sunday, March 11, 2018 9:13 AM To: C&C List Cc: Pierre Tremblay Subject: Stus-List Replace Beckson by Lewmar Standard Hello all, Does someone has experience in replacing Beckson portlight with Lewmar standard? Searching the list archive, I found a reference of an install on a C&C38 1976. According to the install instructions, the surface has to be flat within 1mm maximum. My cabin side has a curve of 6mm on the Size 2 portlight lenght. I'm sure the frame will follow the curve, but will the lens close thight with this frame deformation? Regards, Pierre Tremblay Avalanche #54988 C&C38-3 WK, hull #76 -------------------------------------------------------------------------------- _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
