A trimaran daysailer for aging boomers

skirret

New member
Dear Skirret, please remove that disgusting garbage from this area immediately. Whoever took the time and effort to create that abomination should be sent to the Russian front!
Well technically I'm not even a boomer so I should prolly remove myself entirely if it wasnt that Im also developing a boat for you guys and use these posts as a barometer. I now know if you insult a boomer with a toy boat he strikes back with rage lol
 

munt

Super Anarchist
1,226
241
The belt
Whether or not I could be classified as an explosive device is irrelevant. That perverse, multicolored clown car has no place on a sailing forum. Take it to political anarchy where I'm sure you'll find plenty of people willing to fight to the death over which side of the political spectrum should be held accountable for its existence.
 

MultiThom

Super Anarchist
1,745
392
Benicia, CA
Well technically I'm not even a boomer so I should prolly remove myself entirely if it wasnt that Im also developing a boat for you guys and use these posts as a barometer. I now know if you insult a boomer with a toy boat he strikes back with rage lol
Not rage from most of us...one of the neat things about being a boomer, nowadays, is you've mellowed with age. No longer bitters like IPA, mellow like Anchor Steam.
 
I'm sorry. It had to be done!
Foraging Boomers.JPG




Plagiarism is the sincerest form of flattery
 

Billy Bob

Member
492
70
New Zealand
Progress on my 17.5' trimaran build is coming right along. Should be in the water in January all going well.
2 NACRA f17 c foiling hulls and rig from an olympic sailed boat joined to a center of hull of my design.
Almost ready for primer on the topsides of center hull.
Starting to look the part. A lot of g!assing , sanding and engineering but well worth it. I will be racing against our local YC fleet.
My goal, be first to finish! Franken Tri comes to terrorize.
 

4tied

New member
Back in the beginning of this thread I mentioned I was building a Mongoose 25. Attached is a photo of the progress. Two amas in foreground, then lower pan of the main hull, and beams are on the wall. The rudder and daggerboard are complete. I’m working hard and more consistently now, progress should pickup.

98D1A23D-28DF-484E-B4FA-9EBA11B962D3.jpeg
 

Billy Bob

Member
492
70
New Zealand
This was designed for single or double had racing/sailing to fit my wants for something that will compete at our local yacht club. I am just fishing the fiberglassing and the major fairng. Center hull has been balnced to the NACRA f17 C foiler. Both the hulls, rig and all the hardware came from an olympic campain here in New Zealand. Area for a travler track has been added to my center hull. Carbon tubes will connect the hulls 3960 total beam width. Mast base/partner has been added. minimal dryish storage added forward. I lenghtened to 5260. This boat has been a really fun project so far. Painting in a coupla weeks. This foraging boomer is happy with the progress of his sanding!
Cool looking projec above 4tied good luck with it.
B3 100.jpg
B3 101.jpg
B3 102.jpg
 
Hi Billy Bob,
Looks nice. How wide are the beam tubes on the center hull and what are the dimensions of the different tubes you use for the beams? Water stays? Asking as I just want to compare with the beams I am building for my tri, that is based on slightly larger Nacra 18ft hulls with 19ft center hull with 15.5ft total beam. The ones I use are 106x3, 100x3 and 90x3mm.
 
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Billy Bob

Member
492
70
New Zealand
Cheers revintage,
1) 1400 main hull beam tubing width
Main hull Aluminum tube 100od, 94id
2) Carbon cross tube 93.6od, 88.8id built by c tech.
Total length for carbon beams 3960.

With so much support from the aluminum tubes I didn'tThink it was necessary for water stays.
The mast is supported by the front cross tube and a carbon structure that goes to the deck
and loads spread out on the bottom of the boat with a vertical webbing.
 
Hi,
Noticed we both participated in the Frankenboat thread just after each other. Seems like building small tris is what we do when retired;).

With the 100x3 tube integrated in the main hull it shouldn’t be a problem with stress. Without waterstays one could experience deflection in the outer beam tubes, though. Depends on the structure of the carbon tubes, but as they are from c tech, they are probably as stiff as can be.

As I only have aluminium tubes, I have choosen water stays both for avoiding breakage and to minimize deflection. Also used a 1400mm for the main hull beam, although 106x3mm as the attachment to the main hull is only 350mm wide.

Must say I envy your climate, not so fun building my tri at +10C outdoors.
 
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Bill in NM

New member
1
0
Designing a daysailer for aging boomers

There’s a case to be made for a design of a trimaran that fits the nice market for aging sailors. Boomers are after all the original instigators of the sailboat boom and the love of sailing hasn’t gone away but age puts a limit on agility and physical strength. With the exception of a few old salts, sailors our age like to go out for a few hours when the weather is nice and be back in time for cocktails or other leisure activities, without spending a couple of hours rigging up and rigging down for every outing.

Personally, I want all the good things from daysailers like the Ensign, Alerion, small O’days etc. but without the hull speed limits, the tippy-ness and weight of a monohull.

A trimaran in the 20 to 25 foot range, with a very simple rig that can be completely handled from the cockpit would do nicely. I won’t be looking for a performance-first boat, I’ve had plenty of that and I mostly want the joy of quiet and effortless sailing in semi-protected waters. That said, I don’t want a ‘dog’, so I’ll expect an excellent hull fineness ratio plus good Bruce and RPI numbers but still a safe craft. Of course, that points to lightweight and more expensive construction but I’ve found that using high tech composites selectively doesn’t affect total vessel price by more than a few percent. While my other half says to just buy a Corsair or Dragonfly, I think that there is a case to be made for a new design, as even those beautiful trimarans have way too many strings to pull and are trying too hard to be pocket cruisers/club racers, which also makes them much more expensive. There are several other small tri’s out there, but none have the simplicity nor the low enough price tag that I am looking for.

So here are my ‘specs’ or wish list.

- A flared main hull with high enough bow and topsides to avoid getting doused by small waves or boat wakes plus a deep and roomy cockpit with comfortable seating for 4 and no mid-way obstructing beams or travelers to try to get over. No cruising accommodation, just a minimal cuddy cabin or other arrangement for stowage of essentials.

- Swing or folding arms with firm tramps when deployed, with a handrail on the back beam to get easily on/off the craft- Full amas to enhance stability and flat sailing.

- An open transom would be nice, and swing-up rudder(s?) and centerboard are a must.

- An unstayed wing mast, preferably gimballed or otherwise easy to lower/dis-assemble, placed as far forward as feasible to create extra cockpit space and make the mainsail the primary driving force. An under-foredeck tabernacle would be ideal, and with a carbon wing mast the weight could be kept down sufficiently to make raising/lowering the mast safe and fast. I already made a mock-up of a tabernacle system that is handled by the primary winch and would weigh less than fifty pounds.

- A fully battened square top main on a mast track with cars, with a Dutchman or similar system for easy hoisting/lowering the sail. Plus a self-tacking roller furler jib, cut high enough not to impede visibility.

- Boomless main sail to save the old noggins from an incidental and potentially disastrous whack, with a Heneman sheeting arrangement instead of a traveler.

From reaching out to trimaran designers, builders and other people in the know, I have a great feedback that we could incorporate quickly in a full spec. If we can get a design done over the winter, we can pick a builder next spring and be on the water just in time for COVID to be over!

Looking forward to expert feedback!
Hi Dragonfly -
I am a newbe on the forum that joined just to find out what you ended up doing. Can you please post an update?
Thanks,
Bill in NM
 

Russell Brown

Super Anarchist
1,690
1,297
Port Townsend WA
Back in the beginning of this thread I mentioned I was building a Mongoose 25. Attached is a photo of the progress. Two amas in foreground, then lower pan of the main hull, and beams are on the wall. The rudder and daggerboard are complete. I’m working hard and more consistently now, progress should pickup.

View attachment 552501
I would like to see more! Don't even know what a Mongoose 25 is.
 

MultiThom

Super Anarchist
1,745
392
Benicia, CA
And, in case anyone is wondering, take a look at this video of a small sportboat in big wind and you'll quickly see why a trimaran is the choice for aging boomers.



In 25 years of sailing tri's only fell off once. These guys fall off twice in the same race.
 




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