Not sure, but I'd guess the shaft on anything less than 1 1/2" is solid and anything over that is probably hollow. Our shaft is 3" in diameter and has to be hollow with 1/4" thick walls. I dropped our rudder several years ago and I'd estimate it weighs around 125#, and a solid shaft of that size and length would be 50# heavier. The blade is 5 ft long and the SS shaft is 30" longer, so there is a lot of steel in there.
A good design strategy is to to size things so if the rudder has a strike, like hitting a whale or a log or grounding, the rudder shaft needs to bend (not break) before the boat breaks, so the boat doesn't sink. I think it was in Skene's Elements of Design, if the rudder is strengthened, the boat needs to be made even stronger in that area, to survive a strike. Chuck Resolute 1990 C&C 34R Atlantic City, NJ ----- Original Message ----- From: "Alex Giannelia" <a...@airsensing.com> To: cnc-list@cnc-list.com Sent: Monday, October 22, 2012 2:10:26 PM Subject: Stus-List Rudder Re-build/replacement For those who did a post mortem on their stainless steel shafts, were they hollow or solid? ALEX GIANNELIA Phone (416) 203-9858 Fax (416) 203-9843 Cell (416) 529-0070 email: a...@airsensing.com WEB: www.airsensing.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
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