Interesting thread as I plan to switch bottom paint to Black Widow this spring 
and considered the burnishing option. 
 
I am convinced burnishing makes the hull faster, but not worth the extra money 
and labor for my situation.
 
I decided to not paint a third coat and save the money for paint and hours of 
labor burnishing, also.  I'll paint two coats and get them as smooth as 
possible and call it a day.  Paint is expensive and it's not good for the 
environment to sand it off.  I'm convinced a burnished hull is faster in light 
winds, as it offers less resistance.  This is less of a factor in good wind.  
And in strong win, if you are well powered up, you should be making hullspeed, 
and that's all you can do anyway.
 
To test this theory, I can imagine painting a smaller vessel, say a kayak, and 
set it in a river with person in it, and a simple fish scale tied between the 
bow and a tree, and measure the resistance, "paint unburnished" vs "paint 
burnished".
 
That's my two cents.
Chuck Scheaffer, Resolute 1989 C&C 34R, Annapolis
 
 

> On 04/03/2025 10:41 PM EDT Marek Dziedzic via CnC-List 
> <cnc-list@cnc-list.com> wrote:
>  
>  
> 
> It is more than just articles. There are a lot of actual lab tests. I would 
> gladly participate in your bike test. I use 28 mm with 80 psi. Btw. I 
> switched from 22 mm at 110 psi, and I am faster (Strava supports that claim). 
> And I am a clone of myself (if anything, I should be slower as I moved to the 
> next age category).
> 
>  
> 
> Marek
> 
> 1994 C270 Legato
> 
> Ottawa
> 
> (should I include the bike model?)
> 
>  
> 
> From: David Knecht via CnC-List <cnc-list@cnc-list.com>
> Sent: Thursday, April 3, 2025 5:58 PM
> To: CnC CnC discussion list <cnc-list@cnc-list.com>
> Cc: David Knecht <davidakne...@gmail.com>
> Subject: Stus-List Re: Sanding/burnishing hard bottom paint
> 
>  
> 
> Unlike boat bottom smoothness, there are lots of articles out there on tire 
> pressure and speed (with data).  I would take you up on your race offer, but 
> to do it right, we need to clone one of us and put one clone on your bike (21 
> mm tires at 120 psi) and one clone on my bike (28-32 mm tires at 80 psi).  
> Dave
> 
>  
> 
> Myths Debunked: Higher Tire Pressure is NOT Faster 
> https://www.renehersecycles.com/myth-16-higher-tire-pressure-is-faster/?srsltid=AfmBOork2tEEWJzCXYhjHdtya_q1DZZEJfm5CdFQ4lk7ST0UVoCYRU6r
> 
> renehersecycles.com 
> https://www.renehersecycles.com/myth-16-higher-tire-pressure-is-faster/?srsltid=AfmBOork2tEEWJzCXYhjHdtya_q1DZZEJfm5CdFQ4lk7ST0UVoCYRU6r
>  
> https://www.renehersecycles.com/myth-16-higher-tire-pressure-is-faster/?srsltid=AfmBOork2tEEWJzCXYhjHdtya_q1DZZEJfm5CdFQ4lk7ST0UVoCYRU6r
> 
>  
> 
> David Knecht
> 
> Emeritus Rear Commodore/Thames Yacht Club
> 
> Emeritus Professor/University of Connecticut
> 
> Basketball Capital of the World
> 
>  
> 
>  
> 
>  
> 
>  
> 
> Your contributions help pay the fees associated with this list and help to 
> keep it active. Please help by making a small contribution using PayPal at: 
> https://www.paypal.com/paypalme/stumurray All contributions are greatly 
> appreciated.
> 
Your contributions help pay the fees associated with this list and help to keep 
it active.  Please help by making a small contribution using PayPal at:  
https://www.paypal.com/paypalme/stumurray  All contributions are greatly 
appreciated.

Reply via email to