For sure! I'll post new pics as soon as Il'll take them at the moment only shaft and supports photos available (see attachment). From my...
SukiSolo, many thanks for your suggestions and for your appreciation. Once installed, this rudder has a 4° aft sweep (this is needed because of...
yes, correct. the foam core comes in two halves, both cnc machined. rudder shaft slot is also cnc machined. the two halves will be glued with...
many thanks for the suggestions. I've attached a sketch of rudder blade for futher discussion: [ATTACH] looking forward for any further...
Dear All, I'm an amateur boatbuilder - my last completed project was a 26' radius chine sailboat. Now I'm replacing the old rudder with a new...
Thank you so much for your advice. I'll definitely check all the material one against the other. As regards the flexing, I'm in the range of...
It would be very interesting to compare salt water life of a smooth specimen to salt water life of an hard anodized one. Rgds Ugo
To whom may be concerned: it may be interesting to know that hard coating (aka "black anodizing") dramatically reduces the fatigue life of 6082...
Yes I did I designed the stock OD at bottom bearing using ISO 12215-8, then I double checked using GERR calcs and derived the safety factors....
The SS shaft I am using at the moment is a solid 48mm O.D. bar tapered at both ends. The new alu shaft should be 50mm O.D. solid (OD calculated by...
Dear JSL, I followed ISO CD_12215-8 scantling rules actually (mainly based on ABS scantling rules). My point was originally about bushing...
Thanks for your advice. As regards welding strenght, I'm going to meet ISO reccomendations: A.1.1 General Welding generally reduces corrosion...
U thanks a lot. Just had a look at SC27 website, and got some interesting info. From the drawings I figure out that: Rudder area is close to...
Dear Steve, did your friend use self-aligning bearings for fiberglass shaft supporting? rgds, Ugo
great advice, JSL - lot of info found at Thorden bearings website (engineering manual, bearings sizing software), I'll take a look. almost all of...
Dear Greg, yes, Titanium is quite an option! With Titanium (design stress >450N/mmq) a 40mm stock would be Ok as regards the tensile stress, and...
well - the maximum theoretical speed is about 11.6 knots (at Froude n. of 1.32), and I've already sailed her at about 11knots in a 20knts gust,...
thanks michael the "old" rudder has delrin bushings (ok till now, no play or jammimg) and I still have a 100mm delrin diameter bar available - so...
Dear All, I am an amateur boat builder, I completed my "spirit-of-freedom" project four years ago (for further details see...
