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22ft racing tri, home build...


HenrikB

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Me and a friend designed a 22ft tri, it is now under build in Sweden!

 

The concept is a daysailer with possibility to sleep one or two. We also wanted performance but not on the edge so that it gets tricky to handle when sailing alone.

 

The dimensions was limited by my friends basement, where the boat was to be built. Length 6.5 meters, beam 5.5m. Main hull is 1.4m, that was limited by the door that is 0.71m (main hull is built in 2 halves). Daggerboards and rudders on the amas. The light displacement is 300kg, sailing displ is 600kg.

Sail area upwind 33m2, downwind about 80m2.

The amas are designed with volume enough for flying on one hull.

All carbon and epoxy.

 

Hull, amas, beams anre completed, except final finnish.

Next step is the mast, it will also be vacuumbagged in the basement ;)

All fittings are Harken, Sails are North 3DL.

Plan is to have it on the water summer -09!

 

Some pictures attached.

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Tri650.pdf

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Thank you for the kind words!

 

Build hours is alot for a multi. Compared to a "normal" boat, you have to build alot more parts!

The total build cost is as usual more than you first plan... I think it will end up at about 25-30000$.

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I like it, but why the daggerboards in the amas? I never understood that idea. Also, you mentioned 600 KG. That is 1323 Lbs. That seems heavy for a carbon 22 footer. Does that include a crew of 2. motor, etc?

 

Nice design!

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I like it, but why the daggerboards in the amas? I never understood that idea.

 

For lifting purposes and for higher-flying-of-main-hull :)

 

 

How much pointing ability is given up? It's a tri's primary advantage to a cat to be able to out point them?

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I like it, but why the daggerboards in the amas? I never understood that idea. Also, you mentioned 600 KG. That is 1323 Lbs. That seems heavy for a carbon 22 footer. Does that include a crew of 2. motor, etc?

 

Nice design!

 

The 600kg is max sailing displacement with crew of 3, motor, food, tent, cooking stuff etc.

Empty displacement is 300kg. That is about the same as the multi 23, however, this boat has a lot more volume, and is much stronger built. It is designed for offshore sailing.

 

Congrats, awesome project.

 

Who did the engineering design work for you?

How many hours into the project so far?

Would you do it again?

 

We have done the engineering and design work our selves! We have both built/designed boats before, and I am used to 3D modelling. I was new to surface modelling, but we got it together quite nice I think ;-)

I don't want to think about the hours...

We have both built boats before, so I guess that means we are doing it again :P

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Henrik,tremendous design-beautifull and technically outstanding. One of the few small tri's I've run across designed to fly the main hull. Should be an exciting boat-looking forward to sailing pictures. Thanks!

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I am building a 23' tri. Could you share with us your layup for hull, floats, and beams.

Cheers Drew

 

The floats and main hull basic laminate is 400g carbon rowing (0+90) on each side of 8mm H100 divinycell. The same goes for internal structure exept for main bulkhead and other high loaded structure.

In addition, the main hull also have a 300mm wide 300g uni-directional on each side of centerline on inner and outer skin, below WL.

We used SP-epoxy (8h potlife), vacuum bagged, and post cured in 50deg C.

 

The laminate in the beams is abot 3mm thick. they are built from 2 halves connected to a I-beam centerpiece, see attached drawing.

balkprofil_20080113_5mm.pdf

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I am building a 23' tri. Could you share with us your layup for hull, floats, and beams.

Cheers Drew

 

The floats and main hull basic laminate is 400g carbon rowing (0+90) on each side of 8mm H100 divinycell. The same goes for internal structure exept for main bulkhead and other high loaded structure.

In addition, the main hull also have a 300mm wide 300g uni-directional on each side of centerline on inner and outer skin, below WL.

We used SP-epoxy (8h potlife), vacuum bagged, and post cured in 50deg C.

 

The laminate in the beams is abot 3mm thick. they are built from 2 halves connected to a I-beam centerpiece, see attached drawing.

 

Much appreciated.

Cheers Drew

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I am building a 23' tri. Could you share with us your layup for hull, floats, and beams.

Cheers Drew

 

The floats and main hull basic laminate is 400g carbon rowing (0+90) on each side of 8mm H100 divinycell. The same goes for internal structure exept for main bulkhead and other high loaded structure.

In addition, the main hull also have a 300mm wide 300g uni-directional on each side of centerline on inner and outer skin, below WL.

We used SP-epoxy (8h potlife), vacuum bagged, and post cured in 50deg C.

 

The laminate in the beams is abot 3mm thick. they are built from 2 halves connected to a I-beam centerpiece, see attached drawing.

 

Much appreciated.

Cheers Drew

 

Cheers!

 

What are you building Drew?

Pictures?

 

/Henrik

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Now I am building a similar boat 23' long very thin wave piercing hulls. Should be very fast.

I have a proto type made out of old beach cats that shows what potential is there. It has not got enough boyancy and is very wet but it cuts through the chop beautifully. The next version will deal with the spray and bouancy problems.

The other issue is tacking. It tacks ok but the jib needs to be held until the boat is well on the oposite tack. Is this normal for lite weight tris?

It sailed straight past a F24 on a reach last week, and the F24 was running a screacher and I had a tiny blade jib. I estimate we were about 20% faster.

I will not be selling this new boat but may sell the hull mould when it is finished.

I have also decided to put rudders on floats as I have discovered that when pushed on a reach the main hull lifts and air gets sucked down the rudder at about 19knots+

I also have to sort out the folding system and structural design of the beams.

Any help with a simple lite folding system would be greatly appreciated. I am leaning more towards folding beams with strut, but was also considering carbon sliding beams similar to L7. Beam is retricted to 5.0m using sliding system. I would prefer about 5.4m

Any structural advise would also be greatly appreciated.

Total sailing weight is targeted at 300kg and cost gestimate around $28000.00au

I copied this from another post but it gives some idea what I am trying to achieve. No cabin, light weight racer similar to Multi 23 but folding. Main hull does not have the rocker of the M23 and has chines on the rear 15% to let reduce drag at speed.

The test boat which will be the plug is currently cut in half (again) but I will get a photo soon. Max waterline beam is 300mm. We will vacum infuse the hulls and beams.

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  • 8 months later...

Hello everyone,

 

The project is moving on, boat is now ready for final paint!

Mast is built, rudder and daggerboards still remains.

Nets ready, sails from North delivered, all deckgear from Harken waiting to be fitted after painting.

Attached are some pictures!

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I’m building a small tri for two in the cabin no accommodations except for a built in cooler for grog. You sit 6 inches above the water line. Check out the post TMS-20. This is the design of the original boat but it has been highly modified. Designed more for speed and the waters in South Florida and the Caribbean.

post-36426-1252138463_thumb.png

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Now I am building a similar boat 23' long very thin wave piercing hulls. Should be very fast.

I have a proto type made out of old beach cats that shows what potential is there. It has not got enough boyancy and is very wet but it cuts through the chop beautifully. The next version will deal with the spray and bouancy problems.

The other issue is tacking. It tacks ok but the jib needs to be held until the boat is well on the oposite tack. Is this normal for lite weight tris?

It sailed straight past a F24 on a reach last week, and the F24 was running a screacher and I had a tiny blade jib. I estimate we were about 20% faster.

I will not be selling this new boat but may sell the hull mould when it is finished.

I have also decided to put rudders on floats as I have discovered that when pushed on a reach the main hull lifts and air gets sucked down the rudder at about 19knots+

I also have to sort out the folding system and structural design of the beams.

Any help with a simple lite folding system would be greatly appreciated. I am leaning more towards folding beams with strut, but was also considering carbon sliding beams similar to L7. Beam is retricted to 5.0m using sliding system. I would prefer about 5.4m

Any structural advise would also be greatly appreciated.

Total sailing weight is targeted at 300kg and cost gestimate around $28000.00au

I copied this from another post but it gives some idea what I am trying to achieve. No cabin, light weight racer similar to Multi 23 but folding. Main hull does not have the rocker of the M23 and has chines on the rear 15% to let reduce drag at speed.

The test boat which will be the plug is currently cut in half (again) but I will get a photo soon. Max waterline beam is 300mm. We will vacum infuse the hulls and beams.

 

Henrik, Drew & Manshed,

 

Love your photos Henrik and looking forward to your Drew. Great progress Manshed! We also are building a 23 foot trimaran in NW Washington, although we have taken a different approach. We have collected used parts and pieces from an assortment of boats, and are modifying them to fit together. Total cost will be about $10-12,000 US, although it will not be nearly as pretty as your boat Henrik!

 

We obtained a 23' L-7 ama from Mike Leneman and widened it for our main hull, and a Nacra 6.0 Extreme from FL, which we have lengthened to 23'. We also purchased a broken Mumm 30 mast and some cored carbon panels from Russell Brown, which we will use as our crossbeams, bulheads, floors, etc. Finally, we obtained a carbon mast off a modified "Cathouse" Nacra 6.0. The Nacra Extreme was modified by Randy Smyth and has larger sails, a 100' jib, and a 400+ spin. So far so good, I spent all morning working on it in the garage. Weight should be comparable to Multi 23 as well, but our goal is to make it faster to put together, less dihedral, and less squatty going upwind than the 23. Hope to have it finished within the next month or so, before foul weather takes over here.

 

Henrik, I love your ama sterns, they should plane rather than squat! Will probably start my own thread when we get some photos uploaded.

 

Cheers, and keep us all posted,

 

Mark

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  • 3 weeks later...
  • 3 weeks later...

A friend and I plan to build this beastie.

 

more of a daysailor and a far bit lighter than the Multi or the 7m cabin style tris. Could be fun. Like a sportboat with amas in concept; fun to sail for 2 or 3. 6m approx.

 

Gonna race it in Asia for a bit; fits into a 20 foot container, can be packed up like a weta. At least that's the theory.

 

Really interesting to see the 22 footer which is just a tad bigger, but not so different in concept. The great thing about this sort of size is that like a sportboat, you get a massive return for not too much investment in cost.

 

I guess that's why the weta does well, but for me that's a tad too small; I need something that i can race against farriers and corsairs and the other sandal wearers, not the beach cat beer swillers. Not to cast any stereotypes ;_)

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A friend and I plan to build this beastie.

 

more of a daysailor and a far bit lighter than the Multi or the 7m cabin style tris. Could be fun. Like a sportboat with amas in concept; fun to sail for 2 or 3. 6m approx.

 

Gonna race it in Asia for a bit; fits into a 20 foot container, can be packed up like a weta. At least that's the theory.

 

Really interesting to see the 22 footer which is just a tad bigger, but not so different in concept. The great thing about this sort of size is that like a sportboat, you get a massive return for not too much investment in cost.

 

I guess that's why the weta does well, but for me that's a tad too small; I need something that i can race against farriers and corsairs and the other sandal wearers, not the beach cat beer swillers. Not to cast any stereotypes ;_)

 

 

Hmmm .... looks like a TC rendering??????? Tell us more SteveRo.....

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TC design, yep.

 

After accumulating a lot of rigs, parts, etc, I had the desire to have a boat I can sail at high speed.....so the tri seemed like a nice solution; good for Phangnga and the like - will stick to pornstar action for the Samui regatta but could be fun for some of the others. We have another mate who also wants one, so keen to build two together for some fun.

 

Something like a big weta (which TC also designed although somehow has not been credited for). Less than 300kg and fits in a container plus easily trailerable.

 

How is the biplane coming along???? We also have some plans afoot to sort out the sportboat rules next year and get fair handicapping; perhaps going to an online prize plus a PHRF or SMS system for handicaps; the E7 is rated criminally high; platus are crazily low - we can fix now.

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TC design, yep.

 

After accumulating a lot of rigs, parts, etc, I had the desire to have a boat I can sail at high speed.....so the tri seemed like a nice solution; good for Phangnga and the like - will stick to pornstar action for the Samui regatta but could be fun for some of the others. We have another mate who also wants one, so keen to build two together for some fun.

 

Something like a big weta (which TC also designed although somehow has not been credited for). Less than 300kg and fits in a container plus easily trailerable.

 

How is the biplane coming along???? We also have some plans afoot to sort out the sportboat rules next year and get fair handicapping; perhaps going to an online prize plus a PHRF or SMS system for handicaps; the E7 is rated criminally high; platus are crazily low - we can fix now.

Yes, Tim Clissold was indeed the designer of the Weta - as indicated on his own web site but I understand there were some 'royalty' issues over the Weta design based on the original concept and what the boat was to be used for as opposed to how it was then developed commercially by the guy who commissioned the design.

 

The first of the two new Samui bi-planes was launched late Sept. by KT - this is based on the 750 hull lines we commissioned from Tim but had the sheer 'chopped down' and turned very much into a lightweight minimalist 'hot cat'. Name was changed from Project X to 'Storm' and by all accounts easily achieved over 20 knots on test sail in winds of around 14 knots. Our revised version, in planing hull format, now has all the components completed and coming out of the molds to finish ready for joining and assembling the prototype. Should be around same weight as Storm at approx 650kg but (as you know) will carry the stayed CF rigs from C-Tech. So in addition to the normal 2 x mains we carried on the RB's (and as currently fitted on FS rigs on Storm) we will also be able to fly a 50m2 assy. Very much looking forward to some fast fun sailing in the near future.

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Any pics of the 750 biplane cat?

Ours still in bits, errm, I mean components, at the moment. Should be more pics on our web site as she goes together. I was away when Storm was launched, will check to see if my mate on the test sail has any or snap some next time I'm over on the Rock, probably next week.

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The project is moving on, boat is now ready for final paint!

Mast is built, rudder and daggerboards still remains.

 

Very impressive work, Henrik! Inspiring too! Care to share some details about how you built the mast? Materials and methods?

 

Gert

 

 

The mast was built by joining 4 pieces. A mould was built for a "quarter piece".

Main reason for not doing it in just 2 halves was that the workshop is not long enough.

 

The mast is carbon/epoxy, vacuum bagged. After producing 4 pieces in the mould, upper and lower part was built by joining the two halves. Upper and lower part was than joined with a sleeve on the inside. Also, the spreaders are attached in the same area.

 

The final result is very good, the mast is very stiff, could probably been built a bit lighter... Weight is about 2kg/m, mast track and spreaders included.

 

Some pics attached!

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Some more...

 

 

Amazing looking machine Henrik! Will you be making the plans avalaible at all?

 

 

We have been thinking about it ;) We have produced drawings for most parts, but allot of details is not on the drawings. A skilled builder would not hav any problems building it I think.

It would be fun to see more boats built to this design!

Tri650.pdf

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  • 1 month later...
  • 7 months later...

Would be dissapointing not to see the end product. It's like reading a good book only to find someone has ripped out the last chapter. Very exciting boat. Anyone else building or have built something similar?

 

Cheers

Mojo

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Yes, it has actually hit the water!!

 

Everything came together perfectly, first sail in moderate conditions was great! Got a little nervous as the mast was starting to shake around after an hour of sailing, it turned out the dyneema stays was getting longer and longer... Now changed to pre-tensioned dyneema.

 

Balance is just perfect, flying on one hull feels very comfortable! Yesterday sailing in 10-14kn of wind, we hit 17kn without pushing!

Tomorrow we will try the Code 1 for some more downwind speed...

Still alot to learn on how to sail fast, but the boat feels very promising!

 

Attaching some pictures, I'll try to upload a small vid also!

 

http://www.facebook.com/v/409525606378

http://www.facebook.com/album.php?aid=188128&id=619936378&l=8a1bc65083

 

 

Best regards,

/Henrik

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Yes, it has actually hit the water!!

 

Everything came together perfectly, first sail in moderate conditions was great! Got a little nervous as the mast was starting to shake around after an hour of sailing, it turned out the dyneema stays was getting longer and longer... Now changed to pre-tensioned dyneema.

 

Balance is just perfect, flying on one hull feels very comfortable!

 

 

 

beautiful, Henrik, beautiful

 

got any scary numbers for us in terms of costs and hours?

 

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Thank you for the kind words!

 

Build hours is alot for a multi. Compared to a "normal" boat, you have to build alot more parts!

The total build cost is as usual more than you first plan... I think it will end up at about 25-30000$.

 

thinking of popping any more out from the molds now you know what you are doing?

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We also are building a 23 foot trimaran in NW Washington, although we have taken a different approach. We have collected used parts and pieces from an assortment of boats, and are modifying them to fit together. Total cost will be about $10-12,000 US, although it will not be nearly as pretty as your boat Henrik!

Mark

 

from a year ago

 

how did this turn out Mark?

 

 

 

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Looks fabulous Heinrick! Can't wait to see more as you enjoy finally getting on the water with it. Eric, We are still working on it, probably 3 weeks away from lauch. Doing the final topcoat of paint this weekend, 1 coat today, 2nd coat tomorrow. Bottom paint already on, trailer partway built. Tramps mostly done, still needs inside edge. It's always the prep work that takes the time! Several thousand hours to date. Very ready to get the dang thing on the water. If you think I'm ready, just ask my wife! (Lucky I'm still married, but she'd rather I have an affair with a boat than a woman!) I will post photos here when its assembled, and again after launch.

 

Mark

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don't feel too bad Mark

 

it looks like they had hoped to have the borg boat sailing last summer

 

the devil's in the details

 

and when you are aiming to triple 4ksb speeds

 

the details are very important

 

or it all falls down

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  • 2 weeks later...

Henrik, well done!

What a beautiful tri you guys have built.

I found your homepage about your 33ft:er a while back when i first started to consider building my own boat, and mithril has been very inspirational to me. (exept maby the money and time u had to put in to the build ;)

 

I havent started a build yet but i am considering either the F-22 or the F-32... but its leaning towards the 22 fter because of the build time and price

 

Again, good job!

 

/Frans

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Henrik, well done!

What a beautiful tri you guys have built.

I found your homepage about your 33ft:er a while back when i first started to consider building my own boat, and mithril has been very inspirational to me. (exept maby the money and time u had to put in to the build ;)

 

I havent started a build yet but i am considering either the F-22 or the F-32... but its leaning towards the 22 fter because of the build time and price

 

Again, good job!

 

/Frans

 

 

Hurry up, I think that the F22 plans won't be available after this month because that boat is going into production

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  • 4 weeks later...
  • 1 month later...

Is that a Facnor structural furler on the jib? An STG 3T?

 

I have one of those on my Corsair... Do you have the furling line going through a couple of rope clutches? That seems like an interesting way to go... I don't like how the continuous furling line is set up on my boat right now.

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Yes, that is the Facnor furler, worked ok for a couple of days until the upper swivel got stuck due to destroyed bearings. There was no grease in it at all! We took the furler of and put hanks on the jib instead, works much better! And shape of the jib is also better with horizontal battens.

 

The rope was only going trough one camcleat on the "pulling end", worked fine!

 

 

Is that a Facnor structural furler on the jib? An STG 3T?

 

I have one of those on my Corsair... Do you have the furling line going through a couple of rope clutches? That seems like an interesting way to go... I don't like how the continuous furling line is set up on my boat right now.

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Yes, that is the Facnor furler, worked ok for a couple of days until the upper swivel got stuck due to destroyed bearings. There was no grease in it at all! We took the furler of and put hanks on the jib instead, works much better! And shape of the jib is also better with horizontal battens.

 

The rope was only going trough one camcleat on the "pulling end", worked fine!

 

Interesting! I'm having similar issues with the upper swivel binding on mine, too. I've also been thinking about ditching it and just going with a conventional forestay.

 

I may have to take a closer look at my upper swivel... that's definitely where mine is hanging up... but I thought one of the other halyards may have been fouled in it and causing problems. I'll have to check things out more closely.

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thanks for the video and pics Henrik

 

certainly a beautiful boat and amazingly "factory" looking for a "1-off homebuilt"

 

the mast and mast rotator arm look BETTER than many factory offerings

 

are there any things you would do differently if/when you build boat2?

 

in the video it's good to see the bow clear of the water at speed

 

a video of a tack or gybe would be great as would some video of the leeward ama bow when reaching at speed

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thanks for the video and pics Henrik

 

certainly a beautiful boat and amazingly "factory" looking for a "1-off homebuilt"

 

the mast and mast rotator arm look BETTER than many factory offerings

 

are there any things you would do differently if/when you build boat2?

 

in the video it's good to see the bow clear of the water at speed

 

a video of a tack or gybe would be great as would some video of the leeward ama bow when reaching at speed

 

The weight ended up at 470kg (about 70kg more than desing weight), building #2, it would be lighter, the boat is rock solid with potential for weight savings.

Also, the bows on the amas would probably be possible to make finer, we added quite alot of volume in the upper part. Also, it is very important in light air to keep weight forward, I think it would be possible to "rotate" the amas, lifting the bow compared to main hull. That would help lifting the stern of the main hull a little.

On the other hand, the boat is a dream to handle in air, absolutely balanced and very nice to fly on one hull.

Bertil is now working on mods for next season. New retractable bowsprit, a screacher will be added, anti skid on the "deck", new spreaders angeled more aft, and other small fixes.

 

More vids:

http://www.facebook.com/v/445882821378

 

http://www.facebook.com/v/445887521378

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Very good looking boat...I don't know,if that has been asked before,but what are your future plans?...build and sell more boats(how much would they be)?...maybe sell plans(I may be interested in that)?...or?

...for sure I would like to hear all the rest of the "story"...keep it coming...

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The project is moving on, boat is now ready for final paint!

Mast is built, rudder and daggerboards still remains.

 

Very impressive work, Henrik! Inspiring too! Care to share some details about how you built the mast? Materials and methods?

 

Gert

 

 

The mast was built by joining 4 pieces. A mould was built for a "quarter piece".

Main reason for not doing it in just 2 halves was that the workshop is not long enough.

 

The mast is carbon/epoxy, vacuum bagged. After producing 4 pieces in the mould, upper and lower part was built by joining the two halves. Upper and lower part was than joined with a sleeve on the inside. Also, the spreaders are attached in the same area.

 

The final result is very good, the mast is very stiff, could probably been built a bit lighter... Weight is about 2kg/m, mast track and spreaders included.

 

Some pics attached!

 

Hi Henrik

 

Could you please tell a little bid more about the mast you build? I would like to know some more about the layup plan, dimensions and so on. The boat looks great and the work you have done is an inspiration to all of us. I am currently working on a small F28 trimaran project in Copenhagen.

 

Best regard Mads

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  • 6 months later...

No, it was not Henrik's boat but another homebuild trimaran 'Kapten Treben'. Skipper is Bertil Hunyadi. It was not glorius race for multis because at start time there was not wind at all. After half an hour wind wake up from back and monos cathc up multi fleet and after that it was "restart"

 

- suigeri

 

 

Henrik, did this boat just do the Round Lidingö Race? I was not there but the preliminary results list shows a one-off trimaran that caught my eye.

 

/Martin

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I am curious, the drawings show a tension cord below the crossbeams (for triangulation), sort of like a dolfin striker on a catamaran. What is this corde made of? Does it stay out of the water all the time? Or only touches the tops of big waves?

 

 

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