Making & Installing carbon chainplates in the F25C trimaran
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- čas přidán 15. 08. 2023
- This week we remove the three old stainless steel chainplates and modernize this rigging by building foam core, epoxy & uni-carbon, permanently bonded-in replacements. The F25C kits were supplied with the steel plates, but some owners worked with the boat's designer Ian Farrier to utilize his F85SR model's carbon chainplates for the F25C retrofits. Today's video documents exactly how we did just that.
Amazing job!!! It is well worth it because it's the best Farrier Trimaran of all time just like the F-22R, F-32R, and F-33R.
I love your channel and still dream of finding a "barn find" Trimaran. You certainly know your stuff. 🙂
Well I certainly know how to spend money at the marine supply stores anyway ;)
Superb tutorial on carbon fiber chainplates. Were you a teacher in a former life? You are such an expert you can do it one handed! The project is coming along beautifully. Thank you.
Had to be a very patient boss in a difficult “learning” environment;). Today I really enjoy helping more people get in to performance sailing. And that includes fixing affordable boats like this.
Nice work mate. A weapon in the making!
Just a little treat for you upon return to Marin ;)
Love it!!!!
💪⛵️
One question please master. Just curious. Why did you elect to notch the bulkhead instead of the chainplate? Seems that it might have been easier to slip the notched chainplate down onto the bulkhead, preserving bulkhead integrity, bonding it to it with thickened resin and then overlayered and reinforced just as you did. Beautiful work as always. Pleasure to watch.
The chainplate is engineered stronger than the bulkhead. You have to cut out the weaker link ;). Chainplate integrity is paramount, then let the forces radiate out the deck, hull and bulkhead. Soon I need your coaching on rehabbing the Pacific trailer. Should do the disc brake conversion; drum system looks shot.
Thanks. I knew you would have the answer. Absolutely. Disc brakes are the way to go. Look at the parts list from Pacific Trailers then get out your cut-off wheel and hack that old sh*t out of there and bolt in new.😊
What kind of epoxy did you use or do you have a favorite epoxy for this type of job?
Hi. Everything I’ve been showing is done with West Systems 105 resin and 205 or 206 hardener (slow or fast). If you’re doing much larger projects, you should step up to their ‘big brother’ product, ProSet. Same company. These people were pioneers in boat-build and aerospace composites. Can’t go wrong if you follow their directions.
So… how does someone go about working out how thick a carbon chainplate should be? I’ve read as a rough guide, 1mm of steel chainplate thickness would be the equivalent of 1mm carbon & resin - ideally though I’d like to find a proper calculator to determine thickness, uni spread on the bulkhead, and how long to make the chainplates. Any thoughts?
I wouldn’t build without plans engineered for the righting moment of your boat. And unis don’t go on the bulkhead, so already I’m thinking it’s critical you get pro guidance. Can you find a similar numbers boat that has engineered composites chainplates plans? Alignment of the plate into the boat is very important too.
@@RavenswingsailingSorry, that’s what I meant - unis for the chainplates and then biax (?) to spread the load across the bulkhead. Either way, I’d rather get professional advice for this particular project than guess! It’s the Skip Johnson 43 so there’s minimal info out there on tech specs / righting moments. I reached out to Matt @ the Duracell project but his naval architect’s booked solid. With your experience from the F39 and this tri, any thoughts on a good reference / resource for this work?
Can you find any info on the SJ43’s required mast & rigging strength? That should include things like righting moment. Try to get that number and with it I can talk to you about ballpark fabrics estimates. You might post your engineering query onto Sailing Anarchy building forum. Lots of good people over there. I’ll be offline this week (Ravenswing is crossing Sea of Cortez and remote island hopping). Can talk next week.
@@RavenswingsailingMany thanks - I’ll get that post on SA asap. Have a great time in the Sea of Cortez as well! It’s been really interesting watching your F39 vid series from there👍
Hi Greg! Seems really odd the chain plate locations were not identical.
Do you mean identical to the old ones, or the two new ones identical to each other? The new ones were moved to solve for having to change the cap shrouds length between folded and unfolded.
Does that mean you can eight the mast on the trailer then extend the outer hulls in the water without fear of the mast dropping? If true that would make launching way easier.
@@quigzinator yes, not having to adjust the cap shrouds length attached to those chainplates will make the on-water raising easier.