How We Rebuilt Our Boats Rudder
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- Опубліковано 14 вер 2023
- After we pulled our rudder apart, and unearthing a bit of a mess. In this episode we start the hard work of actually putting it back together again.
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Many thanks to Karl and the team at phantommarine.co.uk/
All music for the video was provided by Josh Woodward.
Free download: www.joshwoodward.com/
Rudder project materials list:
West System:
105 Epoxy resin
205 (fast setting) Hardener
206 (slow setting) Hardener
406 Colloidal Silica
3M - 5200 Fast Cure (sealant/adhesive)
3M - P592 Metal Primer
Expanding Epoxy Foam:
Sicomin PB250 resin
Sicomin DM02 hardener
Fibreglass Lay-Up Schedule:
Internal:-
Combination 225/450
Biaxial 450
Cross Weave 450
Biaxial 450
Cross Weave 450
Biaxial 450
Cross Weave 450
External:-
Chopped Strand 600
Biaxial 450
Cross Weave 450
Biaxial 450
ISO 12215-8:2009
Small craft - Hull construction and scantlings - Part 8: Rudders
www.iso.org/standard/37476.html
Foil Profiles:-
airfoiltools.com/airfoil/detai...
Thanx so much for your work. You are completely different to the usual glib crap. Sound advice and craftsmanship solidly explained; which is what we really need when considering making the similar move. refreshingly practical. and thank god no privileged kids high fiving each other and traipsing half naked as if that kind of vicariousness is what we are after. Again, thanx.
Beautiful workmanship.
Thank you very much 😊
Excellent videography!
Thank you.
Super awesome workmanship.
Simply wonderful work and the craftsmanship is stunning
Excellent work all round.👍
Great video. Looking forward to your next project videos. 👍
That is the best epoxy layup without vacuum bagging I have ever seen on UA-cam
Especially compared to the work being done on Uma.
Miles, you’re both as good as Mads and Ava, really great videos and excellent workmanship. Well done to both of you.
now this is how you rebuild a rudder , finally someone doing it right
I like your use of the periodic table in your titles. Greetings from a formerly sailing biochemist.
That’s quite a job Miles 😮top quality work. This will be the how to forever. 5 ⭐️
Thanks for explaining the process as you go and what you used, very interesting 😊
Great work, I can smell that resin from here.
Great to be able to see the epoxy foam expanding inside and filling all the gaps, fantastic job guys !
Awesome job. You should have titled it Orca Proof mods, I'm guessing you would have a few thousand more views but the comment section would be like the wild west.
Orca proof 💁🏻♂️
I hope we never have to put that to the test 😬
Superb job ! Best regards from FRANCE.
Merci!
Big thanks, really appreciated
Using a large zip lock type bag like a pastry bag with the corner cut off allows easy and rapid application of thickened epoxy and then follow the line with a plastic spoon gives the perfect curve for getting glass mat to cover.
Just a tip, if you ever have to do a layup like this again if you wait till the epoxy is just rigid on the edge lip you can take a utility razor and easily cut off excess cloth. This prevents having to cut it cured which takes longer and risks cutting the original edge you were glassing to.
Because the leading edge of a rudder is subject to variable angles of pitch, a rounded leading edge is preferable to minimize stalling.
Lovely detailed explanation of what you did, thank you. The reason the frame was in such good condition was that it was originally encased in fibreglass. I didn't really understand why you chose not to redo it the same way. Is the foam impermeable?
Yes, the foam we used is epoxy and forms a hydrophobic closed cell structure.
This (in theory) means that even if the rudder gets damaged there should never be any water ingress.
Glad you liked the video 😁
Another outstanding post. Hopefully we won't have to do that but you've given plenty if food for thought. Thank you.
P.S.
Phenomenal teamwork too are you both psychic ?
Just wondering what volume your rudder turned out to be and how much Sicomin foam you used. 👍
Hi there,
The volume of the rudder was:
11.25 packs of Rice Krisipies @ 4.09 litres per pack = 46.01 Litres
The foam expands to x4 it's original volume (weight=volume), so:
46.01 litres ÷ 4 = 11.5 litres
Sicomin recommend ordering + 10% of required volume:
11.5 litres + 10% = 12.65 litres
It comes in 6.8kg packs, so I ordered 2 of these and mixed 11.8kg this was just enough to fill the rudder once expanded.
Hope this helps.
Thanks for the detailed reply. 👍
That's some really tidy work there! It looks like a really well thought out approach the rebuild. Did you have any issues with the expanding foam pressing out on the shells? It looks like it went pretty well.
Hey, thanks.
There were no issues with the expanding foam. We calculated to overfill by 10% as recommended by Sicomin. The stuff expands really slowly so there's very minimal internal pressure on the casing.
Check Mads video @saillife, he does some good testing of the expansion rates.
ua-cam.com/video/2RFzH_NB148/v-deo.htmlsi=DU-J13TJRcorgOzw
Hello, we have 1988 Centurion 47 in Greece and notice a ‘weep’ at the bottom of the rudder. No doubt in need to the same treatment as you have been through. Would you think it is possible to do without having to remove the rudder itself? Many thanks, we really enjoy your videos
Glad you enjoyed the video. Unfortunately this is probably not the answer you are looking for, but yes you will definitely need to remove the rudder.
True, not the answer we were looking for but thanks nonetheless for your honesty 😢
Great video! I’m rebuilding my rudder as well on my 1987 Centurion 42 😂 how much of the expanding foam did you use? Thanks!
The short answer is we used 2 tins, we do break the calculations down in the video.
Bare in mind that temperature also has a contributing factor to the expansion rate.
The interior layers of fiberglass have a negligible effect on strength, as the exterior layers bear most of the load.
that makes zero logical sense , show me your evidence of this
Once the inner layers are bonded to the outer layer it is a monolithic structure and the load is applied to and shared by the whole structure. So your hypothesis is fundamentally flawed.