Here is a topic that I have seen thrown around many different boards, but never really discussed in detatil. I know Capt. Larry has some good info and pics about the retrofit on his 31 JC and have seen Ken Flowers artfully install them on his builds here, and I'm sure First Team as well as others know plenty about them.
With all the info here, fill a novice like me in about the finer points of shaft tubes, pros and cons, installs, etc.
I wonder more about cost and speed of building a downeast boat that influenced whether or not the boat got a shaft tube. Letâ€™s face it, it requires a lot less work and money to go without. I am sure boat design and purpose of use may benefit from having all that water in the keel in some cases.
My Repco had a wet keel and I can't imagine all the old marine life that ended up inside over the years and it was a bit too snappy for me on the drift.
Help me out here.
Does a shaft tube require a separate cooling water source (engine) same as a dripless shaft seal?
Or does the shaft tube "fill with water" through the cutless bearing?
If there is a bearing on the engine side of the shaft tube it will require a water feed to make sure it is kept cool and wet. There are some installs where the tranny is too close to the stuffing box and will prevent the use of a bearing at the upper end of the tube, in this case no water feed is necessary.
If I understand your 36's shaft install correctly it has a "traditional" flax pack bearing/tube/cutless. Correct?
The bearing aft of the tranny??? Is it water fed from the engine??
In a downeast no part of the tube is in the water it's all in the keel so I don't understand how it would reduce drag?
No need for a keel full of water and a big chunk of brass inside and out of hull. Thus reducing weight by a lot. Also you can taper the keel back for better water flow to prop.