Tuesday, May 19, 2009
Ah yes...the transom...At the outset I wanted a modified transom area that would accommodate an insulated lazarette locker with a drain for ice and cold storage of liquid refreshments. I was quite concerned that because I was deviating from Johns plans and "flying solo" so to speak I was on shaky ground when it came to this part of the boat so I decided to build the entire transom locker arrangement with frame 6a as a sub assembly on the bench.
The result is very pleasing and in fact I think it made fitting the chine stringer and seat fronts a lot easier for two reasons:
1. I could fit the chine stringer to the ply bottom and trim it before installing the transom and
2. Standing the transom up at the correct angle off line gave me more confidence because there is no turning back when you are epoxying to the bottom plank.
I have since installed the assembly into the boat and put additional drains in. I have drained the ice box (starboard side) and centre lazarette locker into the cockpit and drained the cockpit into the motor well because I dont want holes in the transom. I'm not sure that this was in fact the best option but it is done so time will tell. Actually the transom assembly was pretty time consuming because of all the fiddly bits. I plan to use the centre locker for my grab bag with flares etc. There is sufficient space between the tiller and the top of the locker for the day storage of cell phone, vhf, sunnies etc. or if required a small auxilary fuel tank for the outboard. I have left a small lip to stop things falling off the top of the locker.
Monday, May 18, 2009
I still need to do a final sand, dry fitting and paint. I can't do a real dry fit the centreboard to the case until later when I roll the boat or cut the obstructing cross members from the building frame - probably once the planks are in place. She seems to go in ok upside down from the top.
Wednesday, April 15, 2009
The position of the notch for the bottom plank on the stem drawing is given as 674mm. Assuming that:
1. The drawing indicating the relative frame positions for all frames is correct and
2. The centrecase is correctly placed at 1775 from the end of the bottom plank but also 810mm behind the forward face of the mast per sheet 3/12 and
3. The stem governs the position of frame #1 physically because the laminated 12mm sides end where frame #1 starts
... then by my estimation, the notch dimension is about 15mm too far forward (or short)on the stem drawing.
This means that when the stem is correctly positioned on the bottom plank, there is a 15mm gap between the end of the 12mm ply bottom plank and the stem notch transition.
This is best illustrated in the picture above.
Having matched the curved profile of the stem to match exactly with the profile of the bottom plank, I was able to bond the 20x20 doublers to the stem before assembly to the bottom plank.
However, the transverse limber hole in the stem at frame 2 creates a break in the doubler and as a result I got the break in the wrong place because I followed the stem drawing alone. In the picture below, the stem doubler was chamfered to line-up with the limber hole in frame #2 which is now correctly positioned forward of the mast. Not a serious thing but it would have been nice to avoid the confusion.