Small trimarans under 20'

If it can handle 800 kg, I dont need stronger. If one of the water stay get load of 800 kg, your are in big fcking trouble beyond compare and its time to call rescue service.
I think all boats you build have a purpose, and a vision where to sail. The purpose for me is a local club racer with rather small waves. Usually the weekly races are canceled if its more wind than 10 m/s. Its a balance how heavy stuff you put on your boat and the weight you add.
Show some photos of the strike?

 

Looks very nice, but that is going to hurt your butt.
And most daysailing multihulls need to ability to move fore and aft on the tramp.
Good luck ducking that boom, not enough for this guy.

Good luck.

When is the launch date?

 

I'm mentally dicking around with a deck sweeping main on Frog. Which is a double sided main only, poor mans' solid wing rig, no jib (just an offwind reacher/whatever).... so, instead of you ducking under main boom, or diagonally battened deck sweeping lower sail, why not move across, when tacking/gybing, in front of the mast?
You'll need some more trampoline forward to achieve this.
And you will have to wait to leeward until the boat gets moving on new tack before crossing to windward.
Your long floats will be able to easily carry your temporary-to-leeward weight.
And everyone knows a deck sweeper main is way more efficient than the conventional and aerodynamically silly setup.
photo: deck sweeping soft/hard sail C Class main; Signor G.

 

"If one of the water stay get load of 800 kg, your are in big fcking trouble beyond compare and its time to call rescue service."

No , you are just lifting the mainhull with one crew sitten on the winward hull !


Cheers

PS : 800 kg is the breaking load, but from 500 kg you start plastic elongation of the wire un til it breaks at 25 / 30 % permanent strain.

 

Some photos and videos of my Strike 20 (5 m beam) :

https://www.dropbox.com/sh/wi2pj01emza07lv/AADocN3LlA25DjzdTHe0uM4Ya?dl=0

After 2 months of trials, we succeeded in getting a tight platform. Huge stress on the forward beam. We needed four 6 mm vectran lines under each side of mainbeam. Dyneema was a total failure, 6 mm dyneema HS needed to re-tighten after each sailing.

Good luck

 

Sorry, it was the building directory, sailing videos are there :
https://www.dropbox.com/sh/ug32rkrarsn83cy/AACE0uUOSLksidTXjNGY8VURa?dl=0

on reaching video mean velocity was 15 kt with 16 kt top speed.

 

It's sailing!

First test-sailing today! Went very well!
Super sunny. Wind, 4 m/s. Most things worked fine. Except I forgot a boat fender under the boat in the beginning. I will upload a film soon if you want to see.



Chris

 

Hobie Island

http://www.hobiecat.com/mirage/mirage-tandem-island/

 

Film from the test sailing

It's definitly a wet ride
https://www.youtube.com/watch?v=Ig6JNmE6z5g

https://www.youtube.com/watch?v=7CBAW0iTi2k
More result in the blog
For the second sailing day, I did some improvements.
Here is my todo-list for now.

• Water stay turnbuckle needs to be on the other way.
• Main sheet was little too hard
• Jib sheet need double controlled
• Jib and code0 need to move 10 cm forward
• Action cam needs to be higher
• GPS must be in center
• Code0 sheets need a redesign
• Trampoline need to be softer somehow
• Both trailers had a major breakdown. Needs to rebuilt
• Rudder attack angle needs to be adjusted

In the future I may need bigger jib, bigger Code0.

 

Well done! Neat video presentation too with speed and tracking position shown.
The waterstays really do hit the water quite a lot - even the windward one seems to regularly splash.
It is a little hard to tell but the rig didn't look too loose and floppy which is a good sign for the integrity of your design. Good on you for putting such an extreme craft together!

 

19' Foiling Trimaran

Unfortunately, it seems the Exocet 19 foiling trimaran is no longer on the Perspective design website: http://www.perspective-design.com/EN_sport_trimaran_19_ft.html#.V60JkU0rLIU
I was really looking forward to that boat!!
All may not be lost-it appears to still be on facebook....

 

For the last few years I have been working on a variety of small trimarans, all under 20ft, all simple to build in plywood. Strike 15, 16, 18, 20 plus the 10ft Tryst

adding to that list now is the 14ft Zeta. We launched it yesterday, in very little wind

Fortunately there was a bit more wind today so I could test it properly. But before going out I wanted to show how light the boat is. So here are two photos, one of me holding up the main hull, the other holding both outriggers.

And then here is a video of the first few minutes sailing. Yes I know, it will get a screecher soon, and the mainsail is horrible (but then it is 20 years old and has been on several boats in its lifetime)

https://www.youtube.com/watch?v=AS7rgAbw9OU

More on the Zeta trimaran here.

http://sailingcatamarans.com/index....-under-25/458-zeta-14ft-singlehanded-trimaran

It will be on display - hopefully finished! - at this years Port Townsend WBF

Richard Woods of Woods Designs

www.sailingcatamarans.com

 

Hi Richards
Some news about another of your new Trimaran. We sailed our Strike 20 for about 3 month now and could get a good performance sample, together with great pleasure (many thanks !). Attached files are our best Velocitek Doppler GPS performances. These runs are in medium wind, flat sea condition in the 10 / 15 kt range, reching under main and 18.5 m² genaker. These data are reliable and repetitive, namely 15 kt 10 s mean velocities and 16 kt topspeed. Two corresponding videos are attached. Many claims on performance of similar Tris are found on this Forum, but none with reliable data attached. I would be curious to get same quality data on other boats to compare !
Cheers

Patrick
https://www.dropbox.com/s/osk0bcb0nl6lut6/Strike 20.mp4?dl=0
https://www.dropbox.com/s/6uk10p6q6jx85qn/VIRB0082.MP4?dl=0

 

Zeta 14

Richard, I'm curious: what is the total immersed buoyancy of one ama?

 

You don't need to be Einstein to roughly assess this youself (Sorry, Richards !). These are low buoyancy outriggers, less than 4 m tength, they should be about 100 liters or less ! As Richard says the boat is designed with the crew weight only to provide most of stability.