I don't have a lot of faith in the mechanical strength of brass so I have tried to beef up these fittings as much as is practical. The plans recommend riveting the gudgeons to the hull but I wanted to be able remove and repair fittings so I have drilled and tapped some 1/4 inch brass rod with a 3/16 whitworth thread and pushed it into a hole through the stern. The fittings have then been screwed in and seem plenty strong enough. At this stage I'm keen to push ahead to launch and fine tune the details later.
Sunday, April 22, 2012
The canoe build plans helpfully note that gudgeons and pintles might be hard to find so the builder should braze them from brass plate. It has been close to 20 years since I have had to braze anything and back then I had the luxury of a fully equipped workshop with an oxy torch. I started by bending some 1.6mm cartridge brass around a 3/4inch former so that it would fit snuggly around 3/4 copper pipe. Initially I tried to use a small portable gas torch to silver solder but to no avail. It took the propane torch with the 9kg gas bottle to provide the heat.
The gudgeons have the 3/4 copper pipe and the pintles have a turned brass spacer. The plan is to use allthread to mount the pintle shafts.
Friday, April 13, 2012
My canoe building schedule may be suffering but I can't let this perfect autumn weather go without making the most of it. A relaxing couple of hours exploring the local lake brings my total at the helm to 128 hours. The canoe has progressed with both the seat and gudgeons and pintles started.
Great NZ video of the Hamilton Waterjet propulsion system. I recommend watching it and hope they will repost with a translation or subtitles soon. Makes me wonder if I can combine a small jet system into a wooden boat? Another retirement project maybe.
Saturday, April 7, 2012
A free day with no commitments! That doesn't happen often. The forecast was for 17 degrees and a ten knot breeze dying off through the day. I decided to try a local boat ramp because I wasn't even sure there would be enough of a breeze to sail. We were greeted by a gusty onshore 12 knots with wave breaking onto the concrete ramp. There was no way I was going to launch in that wind with only rocks either side of the ramp.
Three hours at the helm brings the total to 126 hours.