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Conference unifix::sailing

Title:SAILING
Notice:Please read Note 2.* before participating in this conference
Moderator:UNIFIX::BERENS
Created:Wed Jul 01 1992
Last Modified:Mon Jun 02 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2299
Total number of notes:20724

1867.0. "Bent Spade Rudder Shaft" by BAHIA::CRUZ (Samuel A. Cruz) Wed May 13 1992 10:30


Have a bent spade rudder shaft for a Columbia 36.  The bend is about 45
degrees to port.

Questions:  Are repair of this nature doable?

	    What is the repair process?


Appreciate any help on this aspect.

Regards,

Sam Cruz
721-2533
T.RTitleUserPersonal
Name		DateLines
1867.1Good LuckGIAMEM::SEUFFERTWed May 13 1992 14:3713
    For sure you have to pull the shaft to fix it. Take a hard look at the
    thing as bending the shaft could have damaged the glasswork on the
    rudder. Take the shaft to a machine shop with a press and have them
    staighten it out. Or take it to a boatyard and have them do the same
    thing, probably at more cost. Inspect the hull area to make sure that 
    it is all right and did not suffer any damage from the shaft when it
    was bent. If the bend is too close to the rudder area, then it may take
    a lot more work to straighten it out as it may be impossible to
    strighten the shaft without damaging the rudder.
    At McDougall's boatyard in Falmouth several boats came in with bent
    rudder shafts after Hurricane Bob. No problem straightening them after
    they are pulled out of the boat.
    Good luck.
1867.2Long time no seeGIAMEM::SEUFFERTWed May 13 1992 14:414
    Sammy, Are you still in Club Nautico  de Boqueron? Nice to see
    you traded up. That 26 was a dog. Did you hit the reef? Send me an A1
    and tell me all about it.
    Pedro el Dulce
1867.3Stress and StrengthESDNI4::LAZGINFri May 15 1992 17:555
    Will straightening out a 45 degree bend, further weaken the rudder
    shaft?
    
    Frank
1867.4it'll be weakerUNIFIX::BERENSThe ModeratorMon Jul 06 1992 16:3722
[restored by the Moderator]

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Note 1867.4                  Bent Spade Rudder Shaft                      4 of 4
MAST::SCHUMANN "We've met the enemy, and he is us!"  12 lines  22-MAY-1992 12:55
                              -< it'll be weaker >-
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>    Will straightening out a 45 degree bend, further weaken the rudder
>    shaft?
    
I'm not a mechanical engineer or metallurgist, but if it's really
45 degrees, I'd guess it'll be hard to straighten it without some fatigue
cracks. (Do they use heat when they straighten 'em?)    

You might be able to slip a second tube inside the original tube to provide
additional strength.

--RS