Kim Klaka 0 Posted October 29, 2023 Share Posted October 29, 2023 On 11/05/2022 at 12:21 AM, MartinRF said: Kim Klaka used to hang out on rec.boats on Usenet. He is (used to be?) a researcher at an institute or uni in western Australia. Lars Larsson used to be a hydrodynamics professor at the university I got my degrees at (*). My brother was one of his PhD students. My brother met Kim Klaka during a trip down under in 1995. Now this pops up here. Small planet /Martin *) My boat was built in the workshop of the marine engineering department of that university. Usenet: https://en.wikipedia.org/wiki/Usenet Hello Martin, yes I am still around! I retired from Academia 12 years ago. Re friction and boundary layers (and other yacht design topics) I published an ebook 3 years ago that might be of interest to forum readers. Not sure of the forum policies on advertising so I will just say that if you Google my name and yacht design, it will get you there. Dr Kim Klaka Quote Link to post Share on other sites
MartinRF 75 Posted October 31, 2023 Share Posted October 31, 2023 On 29/10/2023 at 12:10 PM, Kim Klaka said: Hello Martin, yes I am still around! I retired from Academia 12 years ago. Re friction and boundary layers (and other yacht design topics) I published an ebook 3 years ago that might be of interest to forum readers. Not sure of the forum policies on advertising so I will just say that if you Google my name and yacht design, it will get you there. Dr Kim Klaka Hello indeed, Found your web site. It looks like there is some fun reading to be had there. I will 'bookmark' it. /Martin Quote Link to post Share on other sites
Addem 121 Posted November 1, 2023 Share Posted November 1, 2023 1 hour ago, Guest said: . The new hard silane- siloxane epoxy grafted coatings seem to have more promise. Hi. Can you provide more info for Luddites like me? What us this how does it work. Why is it more promising? Quote Link to post Share on other sites
MartinRF 75 Posted May 6 Share Posted May 6 Hempaspeed follow-up now that I have a few seasons worth of experience with this product. How often I have to clean and how easy it is varies from season to season. I don't know why marine life sticks better to Hempaspeed some years. Still not hard to remove though but if I wait too long removing barnacles will result in cratering the surface. Hempaspeed flakes as it ages. A little bit during the sailing season and then mostly at the water line. Then more and anywhere during the winter. The flakes separate mid-Hempaspeed, not at the interface to the primer. This year I had to do a bit of scraping to get rid of the flakes before sanding and painting. Yet the fresh paint released more flakes and they do not dissolve so -- not smooth surface in some places This year Hempel products are subjected to eye-watering price hikes in Sweden 😠 /Martin 1 Quote Link to post Share on other sites
mcp 34 Posted May 7 Share Posted May 7 21 hours ago, MartinRF said: Hempaspeed follow-up now that I have a few seasons worth of experience with this product. How often I have to clean and how easy it is varies from season to season. I don't know why marine life sticks better to Hempaspeed some years. Still not hard to remove though but if I wait too long removing barnacles will result in cratering the surface. Hempaspeed flakes as it ages. A little bit during the sailing season and then mostly at the water line. Then more and anywhere during the winter. The flakes separate mid-Hempaspeed, not at the interface to the primer. This year I had to do a bit of scraping to get rid of the flakes before sanding and painting. Yet the fresh paint released more flakes and they do not dissolve so -- not smooth surface in some places This year Hempel products are subjected to eye-watering price hikes in Sweden 😠 /Martin How do you clean it and how frequently? Also, knowing what you know now, would you still have made this change? Quote Link to post Share on other sites
MartinRF 75 Posted May 8 Share Posted May 8 11 hours ago, mcp said: How do you clean it and how frequently? Also, knowing what you know now, would you still have made this change? On average every four weeks but it varies between years and during season. I use either a scrubber brush or a home made appliance based on a Scotch-Brite like cleaning pad sized 30 by 15 cm. Hull depth is a mere 25 cm so no diving needed. Hard to say. If memory serves I had these alternatives: Finding a source of illegal anti-fouling -- still needs cleaning but less often and only during second half of sailing season. Hempaspeed TF Hempel's Silic One which is more complex to convert to and softer. I was told it would not work on an a boat that lives on a road trailer in winter. It is a couple of hours drive to my launching site. On the other hand I believe Silic One is better at staying clean. Some high-gloss, hard wearing epoxy. Harder work to keep clean but does not need touch up / refreshing each season. Keep in mind that I sail in the Baltic. Different ecosystem, short sailing season. /Martin 2 1 Quote Link to post Share on other sites
Psyche 826 Posted May 8 Author Share Posted May 8 I will stick with paint Quote Link to post Share on other sites
LBD 186 Posted Friday at 05:45 AM Share Posted Friday at 05:45 AM 18 hours ago, Psyche said: I will stick with paint But even the effectiveness of that is becoming questionable Quote Link to post Share on other sites
motorb 45 Posted Saturday at 11:26 AM Share Posted Saturday at 11:26 AM Maybe we should all just go back to cladding our hulls in copper plates? Quote Link to post Share on other sites
Psyche 826 Posted Saturday at 08:52 PM Author Share Posted Saturday at 08:52 PM Copper coat is the modern version but there is a reason it hasn't taken the world by storm Quote Link to post Share on other sites
Black Panther 1,767 Posted Saturday at 10:02 PM Share Posted Saturday at 10:02 PM I'm 8 yrs into coppercoat. Hauled out once. Clean about 4 times over summer. Initial finish about that of a rough paint job, but I believe I could do better. Quote Link to post Share on other sites
Psyche 826 Posted Saturday at 10:28 PM Author Share Posted Saturday at 10:28 PM It appears the success of CC depends very much on how its applied and where the vessel lives, also on expectations as some people have no idea that all antifouls coatings require at least some cleaning between haulouts. Quote Link to post Share on other sites
Steve 49 Posted Saturday at 11:37 PM Share Posted Saturday at 11:37 PM Paint is Less than questionable. It just doesn’t bloody work any more. Spoke to Jim Lott yesterday and he’s saying a pint of Ivomec sheep drench with the paint. No he hasn’t tried it. Yes, there’s lots of these sorts of urban myths doing the rounds. Apparently there are a couple of products approved in Europe which are working. But not here yet. I’m pretty sure the European standards would be good enough for us so not sure what the holdup is. Quote Link to post Share on other sites
Zozza 357 Posted Sunday at 05:38 PM Share Posted Sunday at 05:38 PM So, you know when we had antifoul that really worked with the "good nasties" in it - was it really that damaging to the ocean when we consider how much damaging environmental waste water is released into the ocean by all the worlds cities, and industrial centres? The "damage" that proper antifouling did to the environment surely has to be infinitesimal small in comparison? Or am I just doing sort of Joe Rogan type "Bro Science" here - though I feel the comparison I make is probably valid. Quote Link to post Share on other sites
Black Panther 1,767 Posted Sunday at 09:03 PM Share Posted Sunday at 09:03 PM Gulf harbour marina has more fish than goat island reserve. Quote Link to post Share on other sites
Steve Pope 253 Posted Sunday at 10:20 PM Share Posted Sunday at 10:20 PM 22 hours ago, Steve said: Paint is Less than questionable. It just doesn’t bloody work any more. Spoke to Jim Lott yesterday and he’s saying a pint of Ivomec sheep drench with the paint. No he hasn’t tried it. Yes, there’s lots of these sorts of urban myths doing the rounds. Apparently there are a couple of products approved in Europe which are working. But not here yet. I’m pretty sure the European standards would be good enough for us so not sure what the holdup is. It works well!! 100 mil per 4L, from less than 6 months prior to 2 + years, the odd wipe occasionally if the boat isn't used very often. Quote Link to post Share on other sites
aardvarkash10 1,114 Posted Sunday at 11:10 PM Share Posted Sunday at 11:10 PM 49 minutes ago, Steve Pope said: It works well!! 100 mil per 4L, from less than 6 months prior to 2 + years, the odd wipe occasionally if the boat isn't used very often. In what paint as a base? Quote Link to post Share on other sites
Steve 49 Posted Sunday at 11:21 PM Share Posted Sunday at 11:21 PM 10 minutes ago, aardvarkash10 said: In what paint as a base? hard or soft? Quote Link to post Share on other sites
aardvarkash10 1,114 Posted Sunday at 11:56 PM Share Posted Sunday at 11:56 PM Ablative Quote Link to post Share on other sites
Steve 49 Posted Monday at 12:11 AM Share Posted Monday at 12:11 AM I wonder how the paint shop feels about spraying it on. 1 Quote Link to post Share on other sites
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