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I think DDW, you and I are all thinking along the same line: A reaming tool is precise by maintaining its own center line, but cannot do so over a long length. If we let go the precision in my case, the stern tube case the shaft and stern tube already define a long center line and relieves the...

How big a job was it where you used the hole saw, e.g.: Length, diameter, wall thickness of the tube and epoxy removed; How long did it take and how many hole saw bits were worn out etc.etc. Would really appreciate you sharing the experience. Not much detail of anyone doing this when I googled.

Read through the article and will communicate with Chris Brown. I am also investigating the use of the surveyor's scope with the boat lifted. Very nice article ! Will have to spend some time to go through other articles you referenced in later posts.

Spent a couple of days drafting some ideas for Bill Kimley to review, and hopefully he would support (jigs, TES3100 and other equipment, some muscle power, pizza delivery by Sampans ?) for a typhoon sea trial, and during actual boat lifting to replace the shaft in Hong Kong. In stepping back...

I forgot to correct you on the fact. The boat was delivered with a 3 blade Max Prop (folding). As Bill Kimely suspected it might have been the cause of the vibration, a fixed FOUR blade Prop (ie. the second prop) was installed. The "second prop" is not a 3 blade. Also at the time Bill did...

Thank you so much for taking the time, and for your suggestions. It would take me a lot of time to think through, but perhaps the corrective actions could be tried before I understand the analysis. For your interest, and since it is so easy to generate graphs, all the dominant frequency data...

Thank you for your reply. I will look at the picture in the article and see if/how my boat has any similar issues. Yes the Cardan Shaft in your picture is what I have, though mine looks a bit tattered out as delivered. As stated in another Post/Reply, I plan to re-check for correct phasing...

Thank you for sharing your experience. I believe Destiny is an earlier duck built by Seahorse. Are you the original owner ? Doing away with Cardan shaft seems to be a drastic (and risky) move. I know two DD462 owners did that because the shafts was corroded and in North America, boat yards...

I am getting a free lesson here. If I am a smart student (and I am not), amd I correct I would start looking at the shaft ... On the other hand as stated in an earlier Post/Reply, in the very last (4th) attempt, the Hong Kong Sub-Contractor did insert Whip Bearing No. 2 from the aft, which...

Thank you for your comment. I need to understand the concept of the appropriate vibration analysis which would apply to my boat. As stated in earlier Posts/Replies, I am aware of an approach which I call "Calibrated Theoretical Model". Torsional vibration at various points of the drive train...

I will look into the Fluke meter, though I doubt I can afford one, nor would it help much in the wrong (my) hand. Bill Kimley did ask me to look into hiring a professional, who would bring his/her own equipment. I took the measurement with an Android phone while tied up in the water in an...

Yes, as mentioned in a few earlier Posts/Replies, the shaft was pulled out (ie. no load) and checked for straightness. Not sure what you mean by (propeller) shaft coupling bore and pilot bushing. But the shaft is tapered, and locked with a key to a flange, which is bolted to the flange on the...

Yes, In earlier post/reply, there were some concern and discussion on "telescopic" Cardan Shafts, and I am satisfied these should be ok in design, and these are installed in all other DD462s in practice. Having said that I always looked at mine with some suspicion. I said in another post I...

I think we both understand the vibration is loading related. I just want to point out the boat does not vibrate in water either, if gear in neutral. First time I get some insight on prop blade/hull interaction. Thanks, and I will spend some time to think about it.

Positive Development I said in Post/Reply #6 that I was requesting Seahorse for funding a vibration measurement/analysis. In fact I thought in a later post I said the request went unanswered (but I cannot locate the text anymore). Regardless I am very happy Bill and Stella Kimley just replied...

Thanks for your kind comments and suggestions. Dial gauge was on my mind. I am also thinking about a laser or strobe light etc as suggested at various replies. I need to correct your quote slightly as it has appeared twice. The boat does not vibrate if there is no load, IN OR OUT OF WATER...

Good to hear from you Dan ! Yes I did meet you and your other half. I saw I believe, a thread started by you on this forum, talking about a visit of the yard, with some picture of DD54201. Those were good days for me. Hope you have found the boat you want. George did tell me there is...

I am neither knowledgeable in boat nor a DIY type, but found myself in a situation I need to be one. Thanks to all the knowledge and experience shared with me. For continued help and as my way of appreciating all the help, I will share with the forum what I went through, and what I am going to...

Very expensive to get a professional vibration test done here. I was talking to an academia (see an earlier reply) who heads a vibration test research group. That is beginning to be expensive. I did use Android vibration analysis app, tied up in a typhoon shelter and measured everywhere...

In reply #55 I said I left out another piece of clue: The factory installed whip bearing was found to be burnt, before it was replaced and moved a bit towards the aft (presently about mid way between Prop end Cutlass Bearing, and Thrust Bearing). The diagram below (attached in another earlier...

Thank you ! Will read up. If you come across a zip file, let me know too !

Thank you ! If mechanical interface works out, I probably would just replace with an Aqua Drive

The entire shaft log is buried in the long keel filled with concerte/metal ballast. I cannot imagine any welding work done now.

Another DD542 being built uses 2.5" shaft. Bill Kimley said it is only because the owner wants a Gardner engine which has a higher torque (Bill Kimley is adamant 2" is ok for my DD542, and from simply a torsion strength point of view, that is confirmed by a reputable shaft manufacturer). The...

I have done some measurement with my Android Vibration Apps. I am no expert and could not really interprete the data. Could you elaborate a bit on how you triangulated the source of vibration ? Thanks in advance.