Bud, I took an inventory of opening ports on Harmony, # 91, and she has 2 large opening ports (Galley) @ 21" x 10", 1 medium opening port (aft galley starboard) @ 14" x 8", and 17 small opening ports (all other areas) @ 8" x 5".
Since the large ports are more retangular than the others, I used a simple retangle perimeter calculation. I am sure you have a more accurate measurement. Given the age of the boat (1976), and what I can see as little maintenance over the last several years, I suspect I will have to re-gasket all of the ports. I opened one of the small ports and the entire gasket came out in pieces: I assume the same elsewhere. However on the large galley ports, the gasket is dried and compressed and does not hold out the pooling of water that occurs in all of the ports.
Using the simple retangle perimeter calculation, I came up with roughly 10.5 feet for the large hatches (channel looks to be 1/4" width), 4.0 feet for the medium port (3/8" channel width), and 37.0 feet for the small ports (3/8" channel width). These measurements do not leave any room for installer error.
I would be interested in what your more knowledgeable measurements are. I trust your amounts more than mine! Additionally, if my channel width estimates are not correct, I defer to your knowledge.
I will await your response and then order what you suggest. Thanks again for all of your support and help!
Doug
