carlsnilsson said..
Thank you for your comments Ramona. You are right, I seem to have confused the terms rudder "shaft" and rudder "tube". It is indeed the shaft that is bent. I half-assumed it would be a tube, but I dropped the rudder out today and it appears to be a solid shaft. It certainly is at the top where the tiller attaches. I am somewhat surprised that it seems to have bent more easily than I might have expected. That may indicate that it had been bent before and straightened with heat, thus annealing the shaft at that point - but I am speculating. You may prefer to build a new rudder - at this point I am inclined to first try to repair the present one. I don't mind the annealing at this point and I will try some heating and straightening again. The fact that the shaft does not appear to have been distorted out of round where bent suggests to me that it is still probably solid at this juncture. I would rather the rudder shaft bend than crack or tear the boat hull. You also use both terms "shaft" and "tube" with respect to a new rudder. When you refer to "tube", do you refer to the tube above the water line and within the boat within which the shaft rotates?
I did buy this Hood 20 in NSW , but there is at least another one near Hobart where I live. It is indeed my trailer, properly purchased with the boat.
I just checked your profile Ramona and it appears we have a few things in common: I too grew up in Adelaide and learned to sail there - first crewing as a 13 yr old in Cadet dinghies, then I acquired an old heavyweight sharpie "Kismet" which I sailed with school mates with conspicuous lack of success in races with the Brighton and Seacliff Yacht Club (1951-56). I also worked for the RAN at Rushcutter's Bay 1972-82. You may recall HMAS Kimbla and HMAS Diamantina and I spent quite a lot of time on Kimbla down as far as lat 50 S getting cold and wet. I took some guide from your profile and put a few of those details in mine. Regards.
I actually grew up in Tumby Bay. I mentioned the trailer only because I presumed you were working on this project in your back yard so this is a much easier job. The tube is the part in the hull that the shaft rotates in. Probably SS and 'glassed in to the deck and hull and may or may not have bearings. My quarter tonner I owned previously at 26 feet had the same arrangement and the shaft rotated in the SS tube with no bearings. After a few years there will be some wear and I used strips of plastic milk containers as shims.
If the shaft is bent where it enters the tube it is too close to the fibreglass on the rudder for heat. It's only 25mm or so, so will bend fairly easy with a hydraulic press cold. You might have to consider splitting the blade back in to two halves and straightening the bare shaft.
I was fortunate enough not to serve on HMAS Kimbla but several of my fiends did and they enjoyed the experience. Not a ship I would want to be down South in! I used to see Diamantina doing surveys around my hometown when I was still at school!