Having the transom scooted out the 20" from the bunks is actually helpful in verifying some of the measurements. I got one of those digital protractor thingys so I could measure the various angles.
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The transom is 12˚, which I sort of knew from the drawings I got. Mercury recommends a 14˚ transom for the outboards, and Cruisers Yacht (CY) (the boat manufacturer) uses a 16˚ transom for their outboard models. (Tells me they needed a little more stern lift than standard)
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Anyway, the underside of the swim deck is parallel with the keel (the 36.7" dimensions), which is good to know for building the extension. Dropping a perpendicular from the outer edge of the underside of the swim deck gives a measurement of 44" back to the transom. This will be the length of the additional planing surface of the extension.
I had a couple different drawings from CY showing the offset . . . one showed about 38" and another showed 44". So, 44" is the right number.
4 pieces (surfaces) of the extension pod will mate to the transom. I'm going to use some large paper stuck to the transom to actually trace these pieces. The couple of angles that I measured will indicate the bevel cuts to make in the Coosa board so that the pieces fit well together.
I also have been watching some online videos of building with Coosa. One thing that caught my eye was the use of "3M Marine High Strength Repair Putty" as an adhesive to bond the Coosa together (in addition to screws). The 3M stuff is a bit pricey, but the product information indicated that the adhesive is merely a milled fiber thickened VE resin. Hey, I will be using VE resin !!!
So, instead of buying the 3M putty, I order some milled fiberglass.
This was of interest to me as I did not want to use PL adhesive or anything similar.
That's all i got for now . . . I'll be away for a few days, but then back at it next week.
