Subject: Roger Redwin is alive and well and making centreboards > board bolt insert info follows
----- Original Message -----
From: Ted Rosen  W8231
Sent: Monday, April 06, 2009 7:02 PM
Subject: New centerboard arrived

Al,

Thanks for the referral to Roger Redwin, regarding building a replacement centerboard. The new board arrived today and it looks fantastic. 

 

Ted, W8231


----- Original Message -----
To: Ted Rosen
Sent: Monday, April 06, 2009 9:44 PM

Thanks for letting me know, Ted. I'll put this into the Weekly Whiffle (13 April 09). How much is Roger charging these days? Do you have a recent email for Roger?
 
Best regards,
 
Uncle Al  (W3854)


----- Original Message -----
From: Ted Rosen
Sent: Tuesday, April 07, 2009 7:21 AM

Al,

The cost of the centerboard was $350 plus gst and shipping to Toronto by Greyhound (bus) for a total of just under $400.  Roger’s email is
 
rredwin@mts.net
 
The centerboard does require drilling for the center bolt hole.  I want to incorporate the “Danish bushing” mod.  Would you know where the nylon bushing can be obtained in the Toronto area?
 
Thanks,
 
Ted, W8231


----- Original Message -----
To: Ted Rosen
Cc: Ton Jaspers (W10445)
Sent: Saturday, April 11, 2009 11:40 AM

Hi, Ted:
 
That centreboard price sounds extremely reasonable!! What a deal!!
 
I presume you're talking about the bushing so nicely shown at the very bottom of the Ton Jaspers article at http://www.wayfarer-international.org/WIT/maint.repair.ref/CB.rudder/finishingCB.pdf  I have no idea about stuff like that, so have copied Ton who can doubtless tell us how he went about getting this bushing?
 
Best wishes for a happy Easter,
 
Uncle Al  (W3854)
... and a follow-up about those centreboard bolt inserts invented by our Danish Wayfarers
----- Original Message -----
From: Wayfarer
To: 'Al Schonborn' ; 'Ted Rosen'
Sent: Saturday, April 11, 2009 10:17 PM
Subject: New centerboard

Hi Ted, Uncle Al,
 
I got it from my local hardware store. It was cut from a 25 mm diameter rod of POM. Most folks would call it nylon but POM seems to be a distinctly different material or so I am told. Anyway, they sold it by the meter and after some negotiating they agreed to sell me 10 cm of the stuff. I have no idea what they normally use it for. A friend of me told me POM is a popular material to mill plastic things from and it seems to the material of choice for bearings. It is also known as Delrin. See also: http://en.wikipedia.org/wiki/Polyoxymethylene
 
I cut it to size with a pipe cutter first to ensure the cut is perfectly parallel. Then I finished the cut with an hand saw (iron saw) and a final finish it with a fine hand file. A power saw with guidance to cut at an exact straight angle would be better, but I seem to manage hand tools quite well. 
 
Making the hole in the centreboard: I use a 30 mm trapezium drill that I push through all the way, so I end up with a 30 mm hole. The hole is then filled with an epoxy - glass bubbles (micro-balloons) mixture. After it set and after it is sanded perfectly level with the CB, a 25 mm hole is cut into the epoxy/glass, just large enough to accept the nylon insert with little or no friction. This way the insert is separated from the wood by a layer of 2.5 mm of glass/epoxy. This is a combination of the Danish and English method and it has worked quite well over the years. The CB runs smooth and there is no water ingress damage around the hole whatsoever. And more important the hole does not need to be painted nor can the paint inside the hole wear (because there isn't any).
 
Best wishes,

Ton


The original hole in the board is 5 mm larger than than the 25-mm diameter POM insert.
Uncle Al assumes Ton drilled the hole in the centre of the insert to accommodate the diameter of the CB bolt.


After filling the entire centreboard hole with his epoxy-microballoons mixture, Ton has drilled out a hole that ...


... will accommodate the insert "with little or no friction".


Ton then decided to do the same with his rudder blade.


-----Original Message-----
From: Al Schonborn [mailto:uncle-al3854@cogeco.ca]
Sent: zondag 12 april 2009 4:24
To: Wayfarer; 'Ted Rosen'

Beauties, Ton! I knew I could count on you!!! And in time for tomorrow's Weekly Whiffle, too. And perhaps an addendum to the WIT's CB materials!!
 
Happy Easter!
 
Best regards,
 
Uncle Al  (W3854)
----- Original Message -----
From: Wayfarer
Sent: Saturday, April 11, 2009 11:25 PM

Actually, nylon is one the worst materials for this purpose. Nylon is very hygroscopic, that means it takes on water like a sponge and expands in the process. A well fitted nylon insert would jam the CB after it takes on water (and it will because it is submerged all the time). Nylon is one of those materials you don't want on a boat except as a cover (the expanding nylon waterproofs the weave and and it makes the cloth somewhat breathable if it is dry, kind of like cotton). Now, POM on the other hand is a near perfect material for our purposes. The Nylon insert the Danes use is actually made of POM as well.  
 
Ton
----- Original Message -----
From: Ted Rosen
To: 'Wayfarer' ; 'Al Schonborn'
Sent: Sunday, April 12, 2009 6:45 AM

Al and Ton,

Excellent! Thanks for the detailed instructions.  I will see if I can find the POM/delrin material.  As an alternative I’ve cut 2 disks from the hard white cutting board material currently available in hardware stores.  I will be experimenting with this as well.
 
Best wishes,
 
Ted, W8231
----- Original Message -----
From: Ted Rosen
Sent: Wednesday, April 22, 2009 6:00 PM
Subject: delrin found!

Al,

I’ve located a source for delrin rod for the “Danish bushing”:
 
Plastic World
1140 Sheppard Avenue West Unit 8
Toronto, Ontario M3K 2A2
416 630 6745
 
A 12” length ¾” diameter costs $5 plus taxes. (should be good enough for more than a dozen bushings) it will require cutting and drilling.
 
I hope to be putting this together this weekend.
 
Ted, W8231