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PostPosted: Sat Mar 09, 2013 1:09 pm 
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PostPosted: Sat Mar 09, 2013 4:39 pm 
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new life for trifoiler?


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PostPosted: Sat Mar 09, 2013 9:23 pm 
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Location: BC, Canada
How is your German?


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PostPosted: Sun Mar 10, 2013 7:10 am 
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Location: sarasota,fl
jackB :
I have to admit, thats one of the most impressive boats I've seen (designwise). It looked like it was airborn at a little over 6mph (impressive). The automatic electronic control of all the foils is awesome, and the boat appeared to sail nicely with little effort from the crew.
I'm just curious why they located the main foils so far aft, it looks like a pitchpole waiting to happen to me, I guess I'll never know, as my German sucks.
There is a guy named Tom Spears ( http://www.tspeer.com/Hydrofoils/hydrofoils.html) has quite a bit of experimentation with foils, most of the stuff I did follows his stuff, I used the xfoil program to design mine ( http://web.mit.edu/drela/Public/web/xfoil/ ), and used Solidworks to design all the component parts.
For those not interest in designing/building from scratch, you can buy the Tfoils directly from Hydrosail ( I think their about $1000 bucks ea) at ( https://sites.google.com/site/hydrosail/), they are the same foils used on the Rave.
Here is a video of an Osprey 18 ( http://vimeo.com/35372827) .
It actually might work to take an old H18 or 21, design new cross rails (to make it much wider), add the foils. The only stock parts would be the hulls and the sail rig system, would be a fun project.
Bob


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PostPosted: Sun Mar 10, 2013 8:21 am 
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I've sailed on a couple of cats with the curved foils, and I never really liked them much. It was more like a short, interesting novelty, much like riding a jet ski for the first 5 minutes until you find out what it can do, and then it no longer is fun. I have always thought the T shaped foils were a better way to do it, or at least have more surface area doing the actual supporting than the curved foils you see.

I think using a relatively heavy boat like an 18 or 21 carried by the foils would bring the drag up to the point of maybe no advantage in speed over the standard.


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PostPosted: Sun Mar 10, 2013 9:25 am 
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Location: sarasota,fl
Tom King:
Thats a good analogy about foils, I spent about a yr and a half studying and learning all about foils, then designing and buiding foils for my boat. I used them a few times then got bored just like I did with jetski, you can drive your jetski around Key West Island just a few times before it becomes very boring (though hundreds of people still do every weekend).
I still love to sail, and try to get out every weekend, but anymore I try to keep it simple so I can rig the boat quickly and just have fun out on the water. When things get complex, technical, and expensive, it takes the fun away.
I've watched several trifoilers go out sailing, they look like they sail like a slug trying to get out to open water, and appear to only be used in perfect conditions which only happens a few times a year around here. I think I would get bored with that quickly. I have not seen any foiling cats in my area, it would be fun to watch, but I probably won't build one, and definately don't have $20k to buy one. I think I understand why Hobiecat is not jumping into this novelty market.
I don't want to come across as an expert in any of these areas, I'm not, I'm just a guy who likes to sail, and like to design and build stuff as part of my hobby (just for myself and my own enjoyment).
Bob


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PostPosted: Sun Mar 10, 2013 7:46 pm 
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Location: Sarasota Sailing Squadron
mmiller wrote:
You hit something or ground the boat... it gets expensive real quick.

So, foils as a recreational or broad market feature... I don't think so.


[youtube]https://www.youtube.com/watch?v=43E5zx3LsKs[/youtube]

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PostPosted: Mon Mar 11, 2013 6:17 am 
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optikid :
I was out there the day that trifoiler 41 crashed, I really felt for him (that would really suck). No question about it Trifoilers are awesome boats.

Here is a video of Moths launching, it just looks like way too much work for me to deal with just to go out sailing.

https://www.youtube.com/watch?v=h8Ps5D4_FuE

Bob


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PostPosted: Mon Mar 11, 2013 9:50 am 
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Location: Northfield Minnesota
A Moth is on my shortlist, used ones aren't too bad cost wise, just like anything there is a lot of options as far as use goes. On the higher end about $15k, on the low end $7&8k.

They look like a hoot if you can survive the learning curve.


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PostPosted: Sun Mar 17, 2013 8:16 am 
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fusioneng wrote:
optikid :
I was out there the day that trifoiler 41 crashed, I really felt for him (that would really suck). No question about it Trifoilers are awesome boats.

Here is a video of Moths launching, it just looks like way too much work for me to deal with just to go out sailing.

https://www.youtube.com/watch?v=h8Ps5D4_FuE

Bob


That's the problem with the Moth, difficult to handle and only single seater. Most people sail 2 up.


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PostPosted: Sun Mar 17, 2013 8:20 am 
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Tom King wrote:
I've sailed on a couple of cats with the curved foils, and I never really liked them much. It was more like a short, interesting novelty, much like riding a jet ski for the first 5 minutes until you find out what it can do, and then it no longer is fun. I have always thought the T shaped foils were a better way to do it, or at least have more surface area doing the actual supporting than the curved foils you see.

I think using a relatively heavy boat like an 18 or 21 carried by the foils would bring the drag up to the point of maybe no advantage in speed over the standard.


Curved foils don't really seem to work as well.

When you look at the AC72 boats, they've gone for a more conventional 1/2 t arrangement with some curve in the dagger blade itself presumably to allow for healing so you can sail the boat at various angles on one hull only.

With curved foils or conventional T's as seen in many multi-hull vids the boat sails flat in which case the advantage of losing the drag from the 2nd hull is lost.


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PostPosted: Thu Mar 21, 2013 9:41 pm 
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OOPS -- Wrong Guy ; had to edit out that post ...

Bille Floyd
Hobie 21se owner and sailing addict.


Last edited by Bille on Mon Mar 25, 2013 10:22 am, edited 1 time in total.

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PostPosted: Fri Mar 22, 2013 9:40 am 
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Location: eureka,california
How about a 15 to 16 footer custom build that is full foiling? Give me a few months but the design work is in place and construction may start sooner than thought.

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PostPosted: Fri Mar 22, 2013 9:51 am 
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Location: Netherlands Europe
Also F18,s starting to foil

http://youtu.be/taJYT4eAiWE

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PostPosted: Fri Mar 22, 2013 11:28 am 
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Johan !! wrote:
Also F18,s starting to foil

http://youtu.be/taJYT4eAiWE


That is not a F-18. No where near being a class legal boat. Light hulls, carbon beams, carbon mast, wide beams, J rudders, S/J boards, illegal sail cut. That is a completely different boat that shares the same profile and part of the name with a F-18.

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