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Current Replies for Prop shaft length for Mk2
 
  Prop shaft length for Mk2 (PeterC)
Posted: 6:20:21 pm on 10/12/2013 Modified: 6:39:40 pm on 10/12/2013
 
 I'm planning to put an electric motor in my Mk2. The current Atomic 4 is long dead and some previous owner cut the end of prop shaft. To save on boatyard costs I am hoping to have all the necessary bits assembled before lifting the boat out. I figure I'll need a shaft about 2" longer than the current, measured from inside the boat. But, without taking the boat to the yard and taking the old shaft out and measuring, I don't know what actual new length I'll need. If I knew the original length of the old, I could calculate from there. Anybody have any ideas?

 Peter
 Santa Cruz.

Peter Connolly
Santa Cruz, Ca.
C&C 27 Mk 2

  Re: Prop shaft length for Mk2 (sony2000)
Posted: 11:44:09 am on 10/13/2013 Modified: Never
 
Peter C, congratulations for the conversion. Ha Ha. I'm doing the same myself. Could I access you for design consultations?
That being said, I'm working with 3" of shaft before the stuffing box. As long as your prop is not rubbing up against its support, you can go ahead.
  Re: Prop shaft length for Mk2 (PeterC)
Posted: 4:38:40 pm on 10/14/2013 Modified: Never
 
Hi Sony2000,
     3" to the stuffing box is about the same as with the Atomic 4. It shows one and a half inches between the gearbox coupling and the stuffing box. So the same lenght shaft will probably do.... But what length is it??

 Peter

Peter Connolly
Santa Cruz, Ca.
C&C 27 Mk 2

  Re: Prop shaft length for Mk2 (sony2000)
Posted: 7:20:59 pm on 10/15/2013 Modified: Never
 
Peter, I can't help you on the length of shaft since I don't have a C&C27. Mine is a C&C 29 Mk0, known as a Paceship 29. After designing this boat they opened up their own works.
Why is the length important? A QD bushing needs only 1 1/2" of shaft length to be attached. Onto it you bolt a sheave of 5-6". I guess with 2" more of shaft the sheave will be higher off the hull and further from the dripping water.
  Re: Prop shaft length for Mk2 (davidww1)
Posted: 1:01:26 pm on 10/19/2013 Modified: Never
 
The shaft from a Mk IV is probably the same length as that for a Mark II because C&C lengthened the boat by adding onto the length of the cockpit at the stern, changing little else. That shaft is 35 3/4" overall and 32" from the engine end to the beginning of the taper.


David Weatherston
Towser, Toronto
C&C 27 Mk IV

  Re: Prop shaft length for Mk2 (PeterC)
Posted: 6:00:10 pm on 10/19/2013 Modified: Never
 
 Thank you David. I have decided to also replace the P'bracket bearing. The supplier wants to know the bearing OD dimention, and the strut ID dimention. Would you by any lucky chance know what these might be??

 Peter

Peter Connolly
Santa Cruz, Ca.
C&C 27 Mk 2

  Re: Prop shaft length for Mk2 (davidww1)
Posted: 6:10:03 pm on 10/19/2013 Modified: Never
 
Not off the top of my head. I might be able to find out when boats start coming out of the water over the next few weeks, but the measurement will be from a bearing-in-place; I haven't heard of any owners planning to replace the cutless bearing (but it's not something many people discuss).


David Weatherston
Towser, Toronto
C&C 27 Mk IV

  Re: Prop shaft length for Mk2 (PeterC)
Posted: 6:13:44 pm on 10/19/2013 Modified: Never
 
 If you could I'd sure appreciate it.

 Peter

Peter Connolly
Santa Cruz, Ca.
C&C 27 Mk 2

  Re: Prop shaft length for Mk2 (davidww1)
Posted: 6:30:48 pm on 10/27/2013 Modified: Never
 
Measured with calipers, but with the cutless bearing in place, the opening in the p-bracket of a Mk I (and I have no reason to believe there was any change between marks) came out as 1.223 in. in diameter and 3.518 in long. Keep in mind that this was with the bearing in place, so measurement was half-visual, half jamming the caliber's points into the opening. In other words, the precision of the number may be spurious. Talk to a supplier and see if that value makes sense for a 7/8 shaft.


David Weatherston
Towser, Toronto
C&C 27 Mk IV

  Re: Prop shaft length for Mk2 (PeterC)
Posted: 1:41:58 pm on 10/28/2013 Modified: Never
 
 Thank you David.....

Peter Connolly
Santa Cruz, Ca.
C&C 27 Mk 2

  Re: Prop shaft length for Mk2 (davidww1)
Posted: 2:13:15 pm on 10/28/2013 Modified: Never
 
Thank me if those measurements do any good. If it does work out, let us know what the make and model number / size value should be.


David Weatherston
Towser, Toronto
C&C 27 Mk IV