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Re: Putting Rhapsody's Keel on a diet [Re: Luke Buxton] #11463
04/05/11 07:05 AM
04/05/11 07:05 AM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline OP
Past J/30 Class President
Rhapsody #348  Offline OP
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Luke - according to the specs listed at the bottom of the J/30 Class rules, there is a note that reads tip rounded to a centerline depth of 20mm maximum below Section V. To me that sounds like a curve with a radius just over 0.75". I'm thinking of cutting a section of PVC pipe lengthwise, lining it with release cloth, then filling with thickened epoxy to provide a uniform shape for bonding to the keel bottom.

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Re: Putting Rhapsody's Keel on a diet [Re: Rhapsody #348] #11469
04/06/11 04:01 PM
04/06/11 04:01 PM
Joined: Apr 2004
Posts: 457
Highland Park, NJ
Steve Buzbee Offline
Senior Member
Steve Buzbee  Offline
Senior Member
Joined: Apr 2004
Posts: 457
Highland Park, NJ
Were there ever keels built close to templates? If so, they would have more ballast then all of our short shallow (pre-templating) keels, wouldn't they? If that is the case, would it be legal to add depth to the keel (obviously only up to template limits) using a substance with some weight?


Steve Buzbee
Blue Meanie J/30 #485
Re: Putting Rhapsody's Keel on a diet [Re: Steve Buzbee] #11473
04/06/11 09:52 PM
04/06/11 09:52 PM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline OP
Past J/30 Class President
Rhapsody #348  Offline OP
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Steve - I see no restriction that prevents using lead as a filler. Good luck getting someone to work with hot lead. This is the way that auto body repairs were done before Bondo was invented....

Re: Putting Rhapsody's Keel on a diet [Re: Rhapsody #348] #11474
04/07/11 10:17 AM
04/07/11 10:17 AM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline
Senior Member
Cap'n Vic  Offline
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
Lead powder or lead wool chopped could be two alternatives used as "filler" in epoxy?

Re: Putting Rhapsody's Keel on a diet [Re: Cap'n Vic] #11604
05/02/11 08:11 PM
05/02/11 08:11 PM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline
Senior Member
Cap'n Vic  Offline
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
So OK ... the weather up here actually is getting close to 60 during the day ... at least one day a week with sun. Visited Bill who is trying to catch up on his keel work before the summer starts.


Re: Putting Rhapsody's Keel on a diet [Re: Rhapsody #348] #11607
05/03/11 04:17 PM
05/03/11 04:17 PM
Joined: Oct 2008
Posts: 76
Wilton, CT
B
bemusv2 Offline
Senior Member
bemusv2  Offline
Senior Member
B
Joined: Oct 2008
Posts: 76
Wilton, CT
Bill,

Lookin good! Though I guess if you were working that you missed your intended launch date of last weekend. If it's going into the water before May 18th then let me know and I'll do my best to come up and sail her down with you.

Wes

Last edited by bemusv2; 05/03/11 04:24 PM.
Re: Putting Rhapsody's Keel on a diet [Re: bemusv2] #11608
05/03/11 09:01 PM
05/03/11 09:01 PM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline OP
Past J/30 Class President
Rhapsody #348  Offline OP
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody should go in the travel lift sling late Friday so I can finish the keel bottom and paint Saturday. Boat will launch on Monday 9 May, possibly Sunday if BLM wants to.

Re: Putting Rhapsody's Keel on a diet [Re: Rhapsody #348] #11609
05/04/11 07:27 AM
05/04/11 07:27 AM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline OP
Past J/30 Class President
Rhapsody #348  Offline OP
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Two more images below. All the fairing work was done using West Systems thickened with a combo of colloidal silica and fine fairing compound. It was a pain to sand. I'm going to apply a skim coat of stuff easier to sand to fill minor surface imperfections, then start barrier coating. The bottom section will be done when the boat goes in the sling Friday afternoon, and will launch Sunday or Monday.

The upper leading edge needed to be extended about 1/2" near the top as even with the batten epoxied on, the upper leading edge was not parallel with the rest of the keel leading edge.

[Linked Image]

[Linked Image]

Attached Files
Final-before-skimcoat-2011-05-03.jpg [61.75 KBytes] - (1427 downloads)
Final-before-skimcoat1-2011-05-03.jpg [45.75 KBytes] - (2250 downloads)
Re: Putting Rhapsody's Keel on a diet [Re: Rhapsody #348] #11622
05/05/11 12:38 AM
05/05/11 12:38 AM
Joined: Apr 2007
Posts: 97
Bainbridge Island, WA
JBro Offline
Senior Member
JBro  Offline
Senior Member
Joined: Apr 2007
Posts: 97
Bainbridge Island, WA
Bill-

Nice work! I did this (with help) on another 30 10 yrs ago. That keel was asymetrical - fat on one side mid-chord to the trailing edge and "hollow" on the other aft and very fat forward.

Power planer is indeed the ticket. We used tooling to create template "ridges" with yellow-dyed west filler. Once each was done, we too were able to just drag a bunch of thickened filler across the new template stations (like screeding concrete) and it worked quite well.

It was a long (and physically taxing) project but well worth it. You'll notice a difference (i.e. more consistent on each tack) which always required funky tuning to deal with before. Boat also felt less sticky in the water (but that might have also had to do with burnishing to 1200 too... ;-)

Looks great AND you'll be very happy you did it after you get over the back pain!

Cheers,
Jeff


- Jeff
J/30 #426 - Watusi
Re: Putting Rhapsody's Keel on a diet [Re: JBro] #11623
05/05/11 12:41 AM
05/05/11 12:41 AM
Joined: Apr 2007
Posts: 97
Bainbridge Island, WA
JBro Offline
Senior Member
JBro  Offline
Senior Member
Joined: Apr 2007
Posts: 97
Bainbridge Island, WA
BTW - one tip if you haven't considered it is an airboard for longboarding a little more efficiently. They're used in bodyshops. Those can really cut through the harder west filler/epoxy materials and then you can use 410 (if I recall correctly) for last skin and then a standard manual long board.

Follow with barrier coat (we used interprotect if memory serves), bottom paint, burnish, and splash! Boy - that sure makes it sound easier and faster than it actually is, huh?

Cheers, Jeff

Last edited by JBro; 05/05/11 12:44 AM.

- Jeff
J/30 #426 - Watusi
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